<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 6.4b -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: https://www.novaworks.com -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#Cover" roleURI="http://utimeworld.com/role/Cover" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#BalanceSheets" roleURI="http://utimeworld.com/role/BalanceSheets" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#BalanceSheetsParenthetical" roleURI="http://utimeworld.com/role/BalanceSheetsParenthetical" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#StatementsOfComprehensiveLoss" roleURI="http://utimeworld.com/role/StatementsOfComprehensiveLoss" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#StatementsOfShareholdersEquity" roleURI="http://utimeworld.com/role/StatementsOfShareholdersEquity" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#StatementsOfShareholdersEquityParenthetical" roleURI="http://utimeworld.com/role/StatementsOfShareholdersEquityParenthetical" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#StatementsOfCashFlows" roleURI="http://utimeworld.com/role/StatementsOfCashFlows" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OrganizationAndPrincipalActivities" roleURI="http://utimeworld.com/role/OrganizationAndPrincipalActivities" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#GoingConcern" roleURI="http://utimeworld.com/role/GoingConcern" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#SummaryOfSignificantAccountingPolicies" roleURI="http://utimeworld.com/role/SummaryOfSignificantAccountingPolicies" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#AccountsReceivableNet" roleURI="http://utimeworld.com/role/AccountsReceivableNet" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#PrepaidExpensesAndOtherCurrentAssetsNet" roleURI="http://utimeworld.com/role/PrepaidExpensesAndOtherCurrentAssetsNet" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#Inventories" roleURI="http://utimeworld.com/role/Inventories" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#PropertyAndEquipmentNet" roleURI="http://utimeworld.com/role/PropertyAndEquipmentNet" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#LeaseLiabilities" roleURI="http://utimeworld.com/role/LeaseLiabilities" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#EquityMethodInvestment" roleURI="http://utimeworld.com/role/EquityMethodInvestment" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#Borrowings" roleURI="http://utimeworld.com/role/Borrowings" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OtherPayablesAndAccruedLiabilities" roleURI="http://utimeworld.com/role/OtherPayablesAndAccruedLiabilities" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OtherIncomeNet" roleURI="http://utimeworld.com/role/OtherIncomeNet" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#RelatedPartiesBalancesAndTransactions" roleURI="http://utimeworld.com/role/RelatedPartiesBalancesAndTransactions" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ShareholdersEquity" roleURI="http://utimeworld.com/role/ShareholdersEquity" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#CommitmentsAndContingencies" roleURI="http://utimeworld.com/role/CommitmentsAndContingencies" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#RevenueAndGeographyInformation" roleURI="http://utimeworld.com/role/RevenueAndGeographyInformation" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#CondensedFinancialInformationOfParentCompany" roleURI="http://utimeworld.com/role/CondensedFinancialInformationOfParentCompany" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#SubsequentEvents" roleURI="http://utimeworld.com/role/SubsequentEvents" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#SummaryOfSignificantAccountingPoliciesPolicies" roleURI="http://utimeworld.com/role/SummaryOfSignificantAccountingPoliciesPolicies" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OrganizationAndPrincipalActivitiesTables" roleURI="http://utimeworld.com/role/OrganizationAndPrincipalActivitiesTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#SummaryOfSignificantAccountingPoliciesTables" roleURI="http://utimeworld.com/role/SummaryOfSignificantAccountingPoliciesTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#AccountsReceivableNetTables" roleURI="http://utimeworld.com/role/AccountsReceivableNetTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#PrepaidExpensesAndOtherCurrentAssetsNetTables" roleURI="http://utimeworld.com/role/PrepaidExpensesAndOtherCurrentAssetsNetTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#InventoriesTables" roleURI="http://utimeworld.com/role/InventoriesTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#PropertyAndEquipmentNetTables" roleURI="http://utimeworld.com/role/PropertyAndEquipmentNetTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#LeaseLiabilitiesTables" roleURI="http://utimeworld.com/role/LeaseLiabilitiesTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#EquityMethodInvestmentTables" roleURI="http://utimeworld.com/role/EquityMethodInvestmentTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#BorrowingsTables" roleURI="http://utimeworld.com/role/BorrowingsTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OtherPayablesAndAccruedLiabilitiesTables" roleURI="http://utimeworld.com/role/OtherPayablesAndAccruedLiabilitiesTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OtherIncomeNetTables" roleURI="http://utimeworld.com/role/OtherIncomeNetTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#RelatedPartiesBalancesAndTransactionsTables" roleURI="http://utimeworld.com/role/RelatedPartiesBalancesAndTransactionsTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#RevenueAndGeographyInformationTables" roleURI="http://utimeworld.com/role/RevenueAndGeographyInformationTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#CondensedFinancialInformationOfParentCompanyTables" roleURI="http://utimeworld.com/role/CondensedFinancialInformationOfParentCompanyTables" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfSubsidiariesAndVieDetails" roleURI="http://utimeworld.com/role/ScheduleOfSubsidiariesAndVieDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfBalanceSheetDetails" roleURI="http://utimeworld.com/role/ScheduleOfBalanceSheetDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfRevenueNetIncomeAndCashFlowsOfVieAndSubsidiariesDetails" roleURI="http://utimeworld.com/role/ScheduleOfRevenueNetIncomeAndCashFlowsOfVieAndSubsidiariesDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OrganizationAndPrincipalActivitiesDetailsNarrative" roleURI="http://utimeworld.com/role/OrganizationAndPrincipalActivitiesDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#GoingConcernDetailsNarrative" roleURI="http://utimeworld.com/role/GoingConcernDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfPropertyAndEquipmentAreProvidedUsingStraight-lineMethodOverTheirEstimatedUsefulLivesDetails" roleURI="http://utimeworld.com/role/ScheduleOfPropertyAndEquipmentAreProvidedUsingStraight-lineMethodOverTheirEstimatedUsefulLivesDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfBasicAndDilutedLossPerShareDetails" roleURI="http://utimeworld.com/role/ScheduleOfBasicAndDilutedLossPerShareDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#SummaryOfSignificantAccountingPoliciesDetailsNarrative" roleURI="http://utimeworld.com/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfAccountsReceivableNetDetails" roleURI="http://utimeworld.com/role/ScheduleOfAccountsReceivableNetDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfAllowanceForDoubtfulAccountsDetails" roleURI="http://utimeworld.com/role/ScheduleOfAllowanceForDoubtfulAccountsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#AccountsReceivableNetDetailsNarrative" roleURI="http://utimeworld.com/role/AccountsReceivableNetDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfPrepaidExpensesAndOtherCurrentAssetsNetDetails" roleURI="http://utimeworld.com/role/ScheduleOfPrepaidExpensesAndOtherCurrentAssetsNetDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfPrepaidExpensesAndOtherCurrentAssetsNetOfAllowanceForDoubtfulAccountsDetails" roleURI="http://utimeworld.com/role/ScheduleOfPrepaidExpensesAndOtherCurrentAssetsNetOfAllowanceForDoubtfulAccountsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#PrepaidExpensesAndOtherCurrentAssetsNetDetailsNarrative" roleURI="http://utimeworld.com/role/PrepaidExpensesAndOtherCurrentAssetsNetDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfInventoriesDetails" roleURI="http://utimeworld.com/role/ScheduleOfInventoriesDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfInventoryReserveDetails" roleURI="http://utimeworld.com/role/ScheduleOfInventoryReserveDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfPropertyPlantAndEquipmentNetDetails" roleURI="http://utimeworld.com/role/ScheduleOfPropertyPlantAndEquipmentNetDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#PropertyAndEquipmentNetDetailsNarrative" roleURI="http://utimeworld.com/role/PropertyAndEquipmentNetDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfLeaseExpenseDetails" roleURI="http://utimeworld.com/role/ScheduleOfLeaseExpenseDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfMaturitiesOfLeaseLiabilitiesDetails" roleURI="http://utimeworld.com/role/ScheduleOfMaturitiesOfLeaseLiabilitiesDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#LeaseLiabilitiesDetailsNarrative" roleURI="http://utimeworld.com/role/LeaseLiabilitiesDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfMinimumLeasePaymentsDetails" roleURI="http://utimeworld.com/role/ScheduleOfMinimumLeasePaymentsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfImpairmentOfEquityInterestOfPhilectronicsDetails" roleURI="http://utimeworld.com/role/ScheduleOfImpairmentOfEquityInterestOfPhilectronicsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#EquityMethodInvestmentDetailsNarrative" roleURI="http://utimeworld.com/role/EquityMethodInvestmentDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfBorrowingsDetails" roleURI="http://utimeworld.com/role/ScheduleOfBorrowingsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfBorrowingsDetailsParentheticals" roleURI="http://utimeworld.com/role/ScheduleOfBorrowingsDetailsParentheticals" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfOtherPayablesAndAccruedLiabilitiesDetails" roleURI="http://utimeworld.com/role/ScheduleOfOtherPayablesAndAccruedLiabilitiesDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OtherPayablesAndAccruedLiabilitiesDetailsNarrative" roleURI="http://utimeworld.com/role/OtherPayablesAndAccruedLiabilitiesDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfOtherIncomeNetDetails" roleURI="http://utimeworld.com/role/ScheduleOfOtherIncomeNetDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#OtherIncomeNetDetailsNarrative" roleURI="http://utimeworld.com/role/OtherIncomeNetDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfRelatedPartiesTransactionsDetails" roleURI="http://utimeworld.com/role/ScheduleOfRelatedPartiesTransactionsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfRelatedPartiesTransactionsDetailsParanthetical" roleURI="http://utimeworld.com/role/ScheduleOfRelatedPartiesTransactionsDetailsParanthetical" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfBalanceSheetDetailsParanthetical" roleURI="http://utimeworld.com/role/ScheduleOfBalanceSheetDetailsParanthetical" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ShareholdersEquityDetailsNarrative" roleURI="http://utimeworld.com/role/ShareholdersEquityDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfRevenueAndGeographyInformationDetails" roleURI="http://utimeworld.com/role/ScheduleOfRevenueAndGeographyInformationDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfLocationOfCompanysLong-livedAssetsDetails" roleURI="http://utimeworld.com/role/ScheduleOfLocationOfCompanysLong-livedAssetsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfComprehensiveLossincomeDetails" roleURI="http://utimeworld.com/role/ScheduleOfComprehensiveLossincomeDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#ScheduleOfCashFlowsDetails" roleURI="http://utimeworld.com/role/ScheduleOfCashFlowsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#CondensedFinancialInformationOfParentCompanyDetailsNarrative" roleURI="http://utimeworld.com/role/CondensedFinancialInformationOfParentCompanyDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="wto-20250930.xsd#SubsequentEventsDetailsNarrative" roleURI="http://utimeworld.com/role/SubsequentEventsDetailsNarrative" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/Cover" xlink:title="00000001 - Document - Cover" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/BalanceSheets" xlink:title="00000002 - Statement - Consolidated Balance Sheets (Unaudited)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaapAssetsCurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaapCashAndCashEquivalentsAtCarryingValue" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapCashAndCashEquivalentsAtCarryingValue" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaapAccountsReceivableNetCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapAccountsReceivableNetCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaapPrepaidExpenseAndOtherAssetsCurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapPrepaidExpenseAndOtherAssetsCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="loc_us-gaapOtherReceivablesNetCurrent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapOtherReceivablesNetCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaapInventoryNet" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapInventoryNet" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaapAssetsNoncurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_us-gaapPropertyPlantAndEquipmentNet" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAsset" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAsset" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaapFinanceLeaseRightOfUseAsset" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_us-gaapFinanceLeaseRightOfUseAsset" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaapIntangibleAssetsNetExcludingGoodwill" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_us-gaapIntangibleAssetsNetExcludingGoodwill" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_DeferredLossOnSaleLeaseback" xlink:label="loc_WTODeferredLossOnSaleLeaseback" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_WTODeferredLossOnSaleLeaseback" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets" xlink:label="loc_us-gaapAssets" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapAssetsCurrent" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapAssetsNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaapLiabilitiesCurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaapAccountsPayableCurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapAccountsPayableCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableCurrent" xlink:label="loc_us-gaapNotesPayableCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapNotesPayableCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaapShortTermBorrowings" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapShortTermBorrowings" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceLiabilityCurrent" xlink:label="loc_us-gaapGovernmentAssistanceLiabilityCurrent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapGovernmentAssistanceLiabilityCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaapOtherLiabilitiesCurrent" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapOtherLiabilitiesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_LeaseLiabilityCurrent" xlink:label="loc_WTOLeaseLiabilityCurrent" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_WTOLeaseLiabilityCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaapOtherAccountsPayableAndAccruedLiabilities" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapOtherAccountsPayableAndAccruedLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaapLiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" />
      <link:calculationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapLiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaapLiabilitiesNoncurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaapLongTermDebtNoncurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_us-gaapLongTermDebtNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceLiabilityNoncurrent" xlink:label="loc_us-gaapGovernmentAssistanceLiabilityNoncurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_us-gaapGovernmentAssistanceLiabilityNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_LeaseLiabilitiesNoncurrent" xlink:label="loc_WTOLeaseLiabilitiesNoncurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_WTOLeaseLiabilitiesNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaapLiabilities" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_us-gaapLiabilitiesCurrent" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_us-gaapLiabilitiesNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaapCommonStockValue" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquity" xlink:to="loc_us-gaapCommonStockValue" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaapAdditionalPaidInCapital" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquity" xlink:to="loc_us-gaapAdditionalPaidInCapital" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_SubscriptionReceivables" xlink:label="loc_WTOSubscriptionReceivables" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquity" xlink:to="loc_WTOSubscriptionReceivables" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaapRetainedEarningsAccumulatedDeficit" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquity" xlink:to="loc_us-gaapRetainedEarningsAccumulatedDeficit" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossNetOfTax" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquity" xlink:to="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapStockholdersEquity" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaapMinorityInterest" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapMinorityInterest" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaapLiabilitiesAndStockholdersEquity" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaapCommitmentsAndContingencies" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapCommitmentsAndContingencies" xlink:type="arc" weight="1" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/BalanceSheetsParenthetical" xlink:title="00000003 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/StatementsOfComprehensiveLoss" xlink:title="00000004 - Statement - Consolidated Statements of Comprehensive Loss (Unaudited)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaapGrossProfit" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues" xlink:label="loc_us-gaapRevenues" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapGrossProfit" xlink:to="loc_us-gaapRevenues" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaapCostOfRevenue" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapGrossProfit" xlink:to="loc_us-gaapCostOfRevenue" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaapOperatingExpenses" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingExpense" xlink:label="loc_us-gaapSellingExpense" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingExpenses" xlink:to="loc_us-gaapSellingExpense" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaapGeneralAndAdministrativeExpense" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingExpenses" xlink:to="loc_us-gaapGeneralAndAdministrativeExpense" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncomeExpenseNet" xlink:label="loc_us-gaapOtherOperatingIncomeExpenseNet" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingExpenses" xlink:to="loc_us-gaapOtherOperatingIncomeExpenseNet" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaapOperatingIncomeLoss" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingIncomeLoss" xlink:to="loc_us-gaapGrossProfit" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingIncomeLoss" xlink:to="loc_us-gaapOperatingExpenses" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="loc_us-gaapOperatingIncomeLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaapInterestExpense" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="loc_us-gaapInterestExpense" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaapProfitLoss" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapProfitLoss" xlink:to="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaapIncomeTaxExpenseBenefit" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapProfitLoss" xlink:to="loc_us-gaapIncomeTaxExpenseBenefit" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLoss" xlink:to="loc_us-gaapProfitLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaapNetIncomeLossAttributableToNoncontrollingInterest" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLoss" xlink:to="loc_us-gaapNetIncomeLossAttributableToNoncontrollingInterest" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaapComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapNetIncomeLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaapOtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapOtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaapComprehensiveIncomeNetOfTax" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTax" xlink:to="loc_us-gaapComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaapComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTax" xlink:to="loc_us-gaapComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/StatementsOfShareholdersEquity" xlink:title="00000005 - Statement - Consolidated Statements of Shareholders&apos; Equity" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/StatementsOfShareholdersEquityParenthetical" xlink:title="00000006 - Statement - Consolidated Statements of Shareholders&apos; Equity (Parenthetical)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/StatementsOfCashFlows" xlink:title="00000007 - Statement - Consolidated Statements of Cash Flows (Unaudited)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapNetIncomeLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaapDepreciationAndAmortization" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapDepreciationAndAmortization" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAssetAmortizationExpense" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAssetAmortizationExpense" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaapShareBasedCompensation" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapShareBasedCompensation" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaapGainsLossesOnExtinguishmentOfDebt" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapGainsLossesOnExtinguishmentOfDebt" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaapProvisionForDoubtfulAccounts" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapProvisionForDoubtfulAccounts" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryWriteDown" xlink:label="loc_us-gaapInventoryWriteDown" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapInventoryWriteDown" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaapIncreaseDecreaseInAccountsReceivable" />
      <link:calculationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInAccountsReceivable" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaapIncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" />
      <link:calculationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_IncreaseDecreaseInNotePayableCurrent" xlink:label="loc_WTOIncreaseDecreaseInNotePayableCurrent" />
      <link:calculationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_WTOIncreaseDecreaseInNotePayableCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaapIncreaseDecreaseInInventories" />
      <link:calculationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInInventories" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaapIncreaseDecreaseInAccountsPayable" />
      <link:calculationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInAccountsPayable" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaapIncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities" />
      <link:calculationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_IncreaseDecreaseGovernmentGrants" xlink:label="loc_WTOIncreaseDecreaseGovernmentGrants" />
      <link:calculationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_WTOIncreaseDecreaseGovernmentGrants" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaapIncreaseDecreaseInAccruedIncomeTaxesPayable" />
      <link:calculationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets" xlink:label="loc_us-gaapIncreaseDecreaseInOtherNoncurrentAssets" />
      <link:calculationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInOtherNoncurrentAssets" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability" xlink:label="loc_us-gaapIncreaseDecreaseInOperatingLeaseLiability" />
      <link:calculationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInOperatingLeaseLiability" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInInvestingActivities" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaapPaymentsToAcquirePropertyPlantAndEquipment" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivities" xlink:to="loc_us-gaapPaymentsToAcquirePropertyPlantAndEquipment" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromShortTermDebt" xlink:label="loc_us-gaapProceedsFromShortTermDebt" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapProceedsFromShortTermDebt" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaapProceedsFromIssuanceOfCommonStock" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapProceedsFromIssuanceOfCommonStock" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt" xlink:label="loc_us-gaapProceedsFromRepaymentsOfRelatedPartyDebt" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapProceedsFromRepaymentsOfRelatedPartyDebt" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfShortTermDebt" xlink:label="loc_us-gaapRepaymentsOfShortTermDebt" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapRepaymentsOfShortTermDebt" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeasePrincipalPayments" xlink:label="loc_us-gaapFinanceLeasePrincipalPayments" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapFinanceLeasePrincipalPayments" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="loc_us-gaapNetCashProvidedByUsedInInvestingActivities" xlink:type="arc" weight="1" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaapEffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="loc_us-gaapEffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OrganizationAndPrincipalActivities" xlink:title="999008 - Disclosure - ORGANIZATION AND PRINCIPAL ACTIVITIES" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/GoingConcern" xlink:title="999009 - Disclosure - GOING CONCERN" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/SummaryOfSignificantAccountingPolicies" xlink:title="999010 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/AccountsReceivableNet" xlink:title="999011 - Disclosure - ACCOUNTS RECEIVABLE, NET" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/PrepaidExpensesAndOtherCurrentAssetsNet" xlink:title="999012 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS, NET" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/Inventories" xlink:title="999013 - Disclosure - INVENTORIES" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/PropertyAndEquipmentNet" xlink:title="999014 - Disclosure - PROPERTY AND EQUIPMENT, NET" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/LeaseLiabilities" xlink:title="999015 - Disclosure - LEASE LIABILITIES" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/EquityMethodInvestment" xlink:title="999016 - Disclosure - EQUITY METHOD INVESTMENT" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/Borrowings" xlink:title="999017 - Disclosure - BORROWINGS" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OtherPayablesAndAccruedLiabilities" xlink:title="999018 - Disclosure - OTHER PAYABLES AND ACCRUED LIABILITIES" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OtherIncomeNet" xlink:title="999019 - Disclosure - OTHER INCOME, NET" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/RelatedPartiesBalancesAndTransactions" xlink:title="999020 - Disclosure - RELATED PARTIES BALANCES AND TRANSACTIONS" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ShareholdersEquity" xlink:title="999021 - Disclosure - SHAREHOLDERS&#8217; EQUITY" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/CommitmentsAndContingencies" xlink:title="999022 - Disclosure - COMMITMENTS AND CONTINGENCIES" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/RevenueAndGeographyInformation" xlink:title="999023 - Disclosure - REVENUE AND GEOGRAPHY INFORMATION" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/CondensedFinancialInformationOfParentCompany" xlink:title="999024 - Disclosure - CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/SubsequentEvents" xlink:title="999025 - Disclosure - SUBSEQUENT EVENTS" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:title="999026 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OrganizationAndPrincipalActivitiesTables" xlink:title="999027 - Disclosure - ORGANIZATION AND PRINCIPAL ACTIVITIES (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:title="999028 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/AccountsReceivableNetTables" xlink:title="999029 - Disclosure - ACCOUNTS RECEIVABLE, NET (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/PrepaidExpensesAndOtherCurrentAssetsNetTables" xlink:title="999030 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS, NET (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/InventoriesTables" xlink:title="999031 - Disclosure - INVENTORIES (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/PropertyAndEquipmentNetTables" xlink:title="999032 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/LeaseLiabilitiesTables" xlink:title="999033 - Disclosure - LEASE LIABILITIES (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/EquityMethodInvestmentTables" xlink:title="999034 - Disclosure - EQUITY METHOD INVESTMENT (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/BorrowingsTables" xlink:title="999035 - Disclosure - BORROWINGS (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OtherPayablesAndAccruedLiabilitiesTables" xlink:title="999036 - Disclosure - OTHER PAYABLES AND ACCRUED LIABILITIES (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OtherIncomeNetTables" xlink:title="999037 - Disclosure - OTHER INCOME, NET (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/RelatedPartiesBalancesAndTransactionsTables" xlink:title="999038 - Disclosure - RELATED PARTIES BALANCES AND TRANSACTIONS (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/RevenueAndGeographyInformationTables" xlink:title="999039 - Disclosure - REVENUE AND GEOGRAPHY INFORMATION (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/CondensedFinancialInformationOfParentCompanyTables" xlink:title="999040 - Disclosure - CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfSubsidiariesAndVieDetails" xlink:title="999041 - Disclosure - SCHEDULE OF SUBSIDIARIES AND VIE (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfBalanceSheetDetails" xlink:title="999042 - Disclosure - SCHEDULE OF BALANCE SHEET (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaapAssetsCurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaapCashAndCashEquivalentsAtCarryingValue" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapCashAndCashEquivalentsAtCarryingValue" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaapAccountsReceivableNetCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapAccountsReceivableNetCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaapPrepaidExpenseAndOtherAssetsCurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapPrepaidExpenseAndOtherAssetsCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="loc_us-gaapOtherReceivablesNetCurrent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapOtherReceivablesNetCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaapInventoryNet" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapInventoryNet" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaapAssetsNoncurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_us-gaapPropertyPlantAndEquipmentNet" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAsset" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAsset" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaapFinanceLeaseRightOfUseAsset" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_us-gaapFinanceLeaseRightOfUseAsset" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaapIntangibleAssetsNetExcludingGoodwill" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_us-gaapIntangibleAssetsNetExcludingGoodwill" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_DeferredLossOnSaleLeaseback" xlink:label="loc_WTODeferredLossOnSaleLeaseback" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsNoncurrent" xlink:to="loc_WTODeferredLossOnSaleLeaseback" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets" xlink:label="loc_us-gaapAssets" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapAssetsCurrent" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapAssetsNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaapLiabilitiesCurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaapAccountsPayableCurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapAccountsPayableCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableCurrent" xlink:label="loc_us-gaapNotesPayableCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapNotesPayableCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaapShortTermBorrowings" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapShortTermBorrowings" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceLiabilityCurrent" xlink:label="loc_us-gaapGovernmentAssistanceLiabilityCurrent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapGovernmentAssistanceLiabilityCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaapOtherLiabilitiesCurrent" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapOtherLiabilitiesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_LeaseLiabilityCurrent" xlink:label="loc_WTOLeaseLiabilityCurrent" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_WTOLeaseLiabilityCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaapOtherAccountsPayableAndAccruedLiabilities" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapOtherAccountsPayableAndAccruedLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaapLiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" />
      <link:calculationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapLiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaapLiabilitiesNoncurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaapLongTermDebtNoncurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_us-gaapLongTermDebtNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceLiabilityNoncurrent" xlink:label="loc_us-gaapGovernmentAssistanceLiabilityNoncurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_us-gaapGovernmentAssistanceLiabilityNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_LeaseLiabilitiesNoncurrent" xlink:label="loc_WTOLeaseLiabilitiesNoncurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_WTOLeaseLiabilitiesNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaapLiabilities" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_us-gaapLiabilitiesCurrent" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_us-gaapLiabilitiesNoncurrent" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfRevenueNetIncomeAndCashFlowsOfVieAndSubsidiariesDetails" xlink:title="999043 - Disclosure - SCHEDULE OF REVENUE NET INCOME AND CASH FLOWS OF VIE AND SUBSIDIARIES (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OrganizationAndPrincipalActivitiesDetailsNarrative" xlink:title="999044 - Disclosure - ORGANIZATION AND PRINCIPAL ACTIVITIES (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/GoingConcernDetailsNarrative" xlink:title="999045 - Disclosure - GOING CONCERN (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfPropertyAndEquipmentAreProvidedUsingStraight-lineMethodOverTheirEstimatedUsefulLivesDetails" xlink:title="999046 - Disclosure - SCHEDULE OF PROPERTY AND EQUIPMENT ARE PROVIDED USING THE STRAIGHT-LINE METHOD OVER THEIR ESTIMATED USEFUL LIVES (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfBasicAndDilutedLossPerShareDetails" xlink:title="999047 - Disclosure - SCHEDULE OF BASIC AND DILUTED LOSS PER SHARE (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:title="999048 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfAccountsReceivableNetDetails" xlink:title="999049 - Disclosure - SCHEDULE OF ACCOUNTS RECEIVABLE, NET (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNet" xlink:label="loc_us-gaapAccountsReceivableNet" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="loc_us-gaapAccountsReceivableGrossCurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccountsReceivableNet" xlink:to="loc_us-gaapAccountsReceivableGrossCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaapAllowanceForDoubtfulAccountsReceivableCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccountsReceivableNet" xlink:to="loc_us-gaapAllowanceForDoubtfulAccountsReceivableCurrent" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfAllowanceForDoubtfulAccountsDetails" xlink:title="999050 - Disclosure - SCHEDULE OF ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/AccountsReceivableNetDetailsNarrative" xlink:title="999051 - Disclosure - ACCOUNTS RECEIVABLE, NET (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfPrepaidExpensesAndOtherCurrentAssetsNetDetails" xlink:title="999052 - Disclosure - SCHEDULE OF PREPAID EXPENSES AND OTHER CURRENT ASSETS, NET (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfPrepaidExpensesAndOtherCurrentAssetsNetOfAllowanceForDoubtfulAccountsDetails" xlink:title="999053 - Disclosure - SCHEDULE OF PREPAID EXPENSES AND OTHER CURRENT ASSETS, NET OF ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/PrepaidExpensesAndOtherCurrentAssetsNetDetailsNarrative" xlink:title="999054 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS, NET (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfInventoriesDetails" xlink:title="999055 - Disclosure -  SCHEDULE OF INVENTORIES (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryGross" xlink:label="loc_us-gaapInventoryGross" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryRawMaterials" xlink:label="loc_us-gaapInventoryRawMaterials" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryGross" xlink:to="loc_us-gaapInventoryRawMaterials" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryWorkInProcess" xlink:label="loc_us-gaapInventoryWorkInProcess" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryGross" xlink:to="loc_us-gaapInventoryWorkInProcess" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaapInventoryFinishedGoods" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryGross" xlink:to="loc_us-gaapInventoryFinishedGoods" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaapInventoryNet" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryNet" xlink:to="loc_us-gaapInventoryGross" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryValuationReserves" xlink:label="loc_us-gaapInventoryValuationReserves" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryNet" xlink:to="loc_us-gaapInventoryValuationReserves" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfInventoryReserveDetails" xlink:title="999056 - Disclosure - SCHEDULE OF INVENTORY RESERVE (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfPropertyPlantAndEquipmentNetDetails" xlink:title="999057 - Disclosure - SCHEDULE OF PROPERTY, PLANT AND EQUIPMENT, NET (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaapPropertyPlantAndEquipmentGross" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapPropertyPlantAndEquipmentNet" xlink:to="loc_us-gaapPropertyPlantAndEquipmentGross" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaapAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapPropertyPlantAndEquipmentNet" xlink:to="loc_us-gaapAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_PropertyPlantAndEquipmentImpairments" xlink:label="loc_WTOPropertyPlantAndEquipmentImpairments" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapPropertyPlantAndEquipmentNet" xlink:to="loc_WTOPropertyPlantAndEquipmentImpairments" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/PropertyAndEquipmentNetDetailsNarrative" xlink:title="999058 - Disclosure - PROPERTY AND EQUIPMENT, NET (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfLeaseExpenseDetails" xlink:title="999059 - Disclosure - SCHEDULE OF LEASE EXPENSE (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaapLeaseCost" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaapOperatingLeaseCost" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLeaseCost" xlink:to="loc_us-gaapOperatingLeaseCost" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfMaturitiesOfLeaseLiabilitiesDetails" xlink:title="999060 - Disclosure - SCHEDULE OF MATURITIES OF LEASE LIABILITIES (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDue" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearOne" xlink:label="loc_WTOLesseeOperatingLeaseLiabilityPaymentsDueAfterYearOne" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDue" xlink:to="loc_WTOLesseeOperatingLeaseLiabilityPaymentsDueAfterYearOne" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/LeaseLiabilitiesDetailsNarrative" xlink:title="999061 - Disclosure - LEASE LIABILITIES (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfMinimumLeasePaymentsDetails" xlink:title="999062 - Disclosure - SCHEDULE OF MINIMUM LEASE PAYMENTS (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDue" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueNextTwelveMonths" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapFinanceLeaseLiabilityPaymentsDue" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearTwo" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapFinanceLeaseLiabilityPaymentsDue" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearTwo" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearThree" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapFinanceLeaseLiabilityPaymentsDue" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearThree" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearFour" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapFinanceLeaseLiabilityPaymentsDue" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearFour" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaapFinanceLeaseLiabilityUndiscountedExcessAmount" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapFinanceLeaseLiabilityPaymentsDue" xlink:to="loc_us-gaapFinanceLeaseLiabilityUndiscountedExcessAmount" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfImpairmentOfEquityInterestOfPhilectronicsDetails" xlink:title="999063 - Disclosure - SCHEDULE OF IMPAIRMENT OF EQUITY INTEREST OF PHILECTRONICS (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaapEquityMethodInvestments" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentAggregateCost" xlink:label="loc_us-gaapEquityMethodInvestmentAggregateCost" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapEquityMethodInvestments" xlink:to="loc_us-gaapEquityMethodInvestmentAggregateCost" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_EquityMethodInvestmenImpairmentProvision" xlink:label="loc_WTOEquityMethodInvestmenImpairmentProvision" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapEquityMethodInvestments" xlink:to="loc_WTOEquityMethodInvestmenImpairmentProvision" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/EquityMethodInvestmentDetailsNarrative" xlink:title="999064 - Disclosure - EQUITY METHOD INVESTMENT (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfBorrowingsDetails" xlink:title="999065 - Disclosure - SCHEDULE OF BORROWINGS (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfBorrowingsDetailsParentheticals" xlink:title="999066 - Disclosure - SCHEDULE OF BORROWINGS (Details) (Parentheticals)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfOtherPayablesAndAccruedLiabilitiesDetails" xlink:title="999067 - Disclosure - SCHEDULE OF OTHER PAYABLES AND ACCRUED LIABILITIES (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilities" xlink:label="loc_us-gaapAccruedLiabilitiesAndOtherLiabilities" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_AdvanceFromCustomers" xlink:label="loc_WTOAdvanceFromCustomers" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesAndOtherLiabilities" xlink:to="loc_WTOAdvanceFromCustomers" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedPayrollTaxesCurrent" xlink:label="loc_us-gaapAccruedPayrollTaxesCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesAndOtherLiabilities" xlink:to="loc_us-gaapAccruedPayrollTaxesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesAndExciseTaxPayableCurrent" xlink:label="loc_us-gaapSalesAndExciseTaxPayableCurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesAndOtherLiabilities" xlink:to="loc_us-gaapSalesAndExciseTaxPayableCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableOtherCurrent" xlink:label="loc_us-gaapAccountsPayableOtherCurrent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesAndOtherLiabilities" xlink:to="loc_us-gaapAccountsPayableOtherCurrent" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OtherPayablesAndAccruedLiabilitiesDetailsNarrative" xlink:title="999068 - Disclosure - OTHER PAYABLES AND ACCRUED LIABILITIES (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfOtherIncomeNetDetails" xlink:title="999069 - Disclosure - SCHEDULE OF OTHER INCOME NET (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncomeExpenseNet" xlink:label="loc_us-gaapOtherOperatingIncomeExpenseNet" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized" xlink:label="loc_us-gaapForeignCurrencyTransactionGainLossUnrealized" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOtherOperatingIncomeExpenseNet" xlink:to="loc_us-gaapForeignCurrencyTransactionGainLossUnrealized" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentAssistanceExpense" xlink:label="loc_us-gaapGovernmentAssistanceExpense" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOtherOperatingIncomeExpenseNet" xlink:to="loc_us-gaapGovernmentAssistanceExpense" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaapOtherNonoperatingIncomeExpense" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOtherOperatingIncomeExpenseNet" xlink:to="loc_us-gaapOtherNonoperatingIncomeExpense" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/OtherIncomeNetDetailsNarrative" xlink:title="999070 - Disclosure - OTHER INCOME, NET (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfRelatedPartiesTransactionsDetails" xlink:title="999071 - Disclosure - SCHEDULE OF RELATED PARTIES TRANSACTIONS (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfRelatedPartiesTransactionsDetailsParanthetical" xlink:title="999072 - Disclosure - SCHEDULE OF RELATED PARTIES TRANSACTIONS (Details) (Paranthetical)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfBalanceSheetDetailsParanthetical" xlink:title="999073 - Disclosure - SCHEDULE OF BALANCE SHEET (Details) (Paranthetical)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ShareholdersEquityDetailsNarrative" xlink:title="999074 - Disclosure - SHAREHOLDERS&#8217; EQUITY (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfRevenueAndGeographyInformationDetails" xlink:title="999075 - Disclosure - SCHEDULE OF REVENUE AND GEOGRAPHY INFORMATION (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfLocationOfCompanysLong-livedAssetsDetails" xlink:title="999076 - Disclosure - SCHEDULE OF LOCATION OF THE COMPANY&#8217;S LONG-LIVED ASSETS (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfComprehensiveLossincomeDetails" xlink:title="999077 - Disclosure - SCHEDULE OF COMPREHENSIVE (LOSS)/INCOME (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets" xlink:label="loc_us-gaapAssets" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaapCashAndCashEquivalentsAtCarryingValue" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapCashAndCashEquivalentsAtCarryingValue" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaapPrepaidExpenseAndOtherAssetsCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapPrepaidExpenseAndOtherAssetsCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_IntercompanyReceivable" xlink:label="loc_WTOIntercompanyReceivable" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_WTOIntercompanyReceivable" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="loc_us-gaapInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaapLiabilities" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_IntercompanyPayables" xlink:label="loc_WTOIntercompanyPayables" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_WTOIntercompanyPayables" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilities" xlink:label="loc_us-gaapOtherLiabilities" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_us-gaapOtherLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaapOtherAccountsPayableAndAccruedLiabilities" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_us-gaapOtherAccountsPayableAndAccruedLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaapCommonStockValue" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapCommonStockValue" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaapAdditionalPaidInCapitalCommonStock" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapAdditionalPaidInCapitalCommonStock" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_SubscriptionReceivables" xlink:label="loc_WTOSubscriptionReceivables" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_WTOSubscriptionReceivables" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaapRetainedEarningsAccumulatedDeficit" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapRetainedEarningsAccumulatedDeficit" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossNetOfTax" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaapLiabilitiesAndStockholdersEquity" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapLiabilities" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaapProfitLoss" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaapIncomeLossFromEquityMethodInvestments" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapProfitLoss" xlink:to="loc_us-gaapIncomeLossFromEquityMethodInvestments" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingCostsAndExpenses" xlink:label="loc_us-gaapOperatingCostsAndExpenses" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapProfitLoss" xlink:to="loc_us-gaapOperatingCostsAndExpenses" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaapComprehensiveIncomeNetOfTax" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTax" xlink:to="loc_us-gaapProfitLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaapOtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTax" xlink:to="loc_us-gaapOtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/ScheduleOfCashFlowsDetails" xlink:title="999078 - Disclosure - SCHEDULE OF CASH FLOWS (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaapProfitLoss" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapProfitLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaapIncomeLossFromEquityMethodInvestments" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncomeLossFromEquityMethodInvestments" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaapShareBasedCompensation" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapShareBasedCompensation" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaapIncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherAccountsPayable" xlink:label="loc_us-gaapIncreaseDecreaseInOtherAccountsPayable" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInOtherAccountsPayable" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInDueFromRelatedParties" xlink:label="loc_us-gaapIncreaseDecreaseInDueFromRelatedParties" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInDueFromRelatedParties" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherAccruedLiabilities" xlink:label="loc_us-gaapIncreaseDecreaseInOtherAccruedLiabilities" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInOtherAccruedLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="wto-20250930.xsd#WTO_ProceedsFromLoanReceivedFromAShareholder" xlink:label="loc_WTOProceedsFromLoanReceivedFromAShareholder" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="loc_WTOProceedsFromLoanReceivedFromAShareholder" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaapProceedsFromIssuanceOfCommonStock" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="loc_us-gaapProceedsFromIssuanceOfCommonStock" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaapEffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="loc_us-gaapEffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/CondensedFinancialInformationOfParentCompanyDetailsNarrative" xlink:title="999079 - Disclosure - CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://utimeworld.com/role/SubsequentEventsDetailsNarrative" xlink:title="999080 - Disclosure - SUBSEQUENT EVENTS (Details Narrative)" />
</link:linkbase>
