<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 6.6a -->
    <!-- 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="ocac-20260630.xsd#Cover" roleURI="http://oceancapitalacquisitioncorporation.com/role/Cover" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#BalanceSheets" roleURI="http://oceancapitalacquisitioncorporation.com/role/BalanceSheets" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#BalanceSheetsParenthetical" roleURI="http://oceancapitalacquisitioncorporation.com/role/BalanceSheetsParenthetical" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#StatementsOfOperations" roleURI="http://oceancapitalacquisitioncorporation.com/role/StatementsOfOperations" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#StatementsOfChangesInShareholdersDeficit" roleURI="http://oceancapitalacquisitioncorporation.com/role/StatementsOfChangesInShareholdersDeficit" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#StatementsOfCashFlows" roleURI="http://oceancapitalacquisitioncorporation.com/role/StatementsOfCashFlows" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/cyd/2026/cyd-2026.xsd#CybersecurityRiskManagementAndStrategyDisclosure" roleURI="http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/cyd/2026/cyd-2026.xsd#MaterialCybersecurityIncidentDisclosure" roleURI="http://xbrl.sec.gov/cyd/role/MaterialCybersecurityIncidentDisclosure" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#DescriptionOfOrganizationBusinessOperationsAndGoingConcern" roleURI="http://oceancapitalacquisitioncorporation.com/role/DescriptionOfOrganizationBusinessOperationsAndGoingConcern" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SignificantAccountingPolicies" roleURI="http://oceancapitalacquisitioncorporation.com/role/SignificantAccountingPolicies" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#InitialPublicOffering" roleURI="http://oceancapitalacquisitioncorporation.com/role/InitialPublicOffering" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#PrivatePlacement" roleURI="http://oceancapitalacquisitioncorporation.com/role/PrivatePlacement" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#RelatedPartyTransactions" roleURI="http://oceancapitalacquisitioncorporation.com/role/RelatedPartyTransactions" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#RedeemableOrdinarySharesAndShareholdersDeficit" roleURI="http://oceancapitalacquisitioncorporation.com/role/RedeemableOrdinarySharesAndShareholdersDeficit" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#CommitmentsAndContingencies" roleURI="http://oceancapitalacquisitioncorporation.com/role/CommitmentsAndContingencies" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#FairValueMeasurements" roleURI="http://oceancapitalacquisitioncorporation.com/role/FairValueMeasurements" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SegmentReporting" roleURI="http://oceancapitalacquisitioncorporation.com/role/SegmentReporting" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SubsequentEvents" roleURI="http://oceancapitalacquisitioncorporation.com/role/SubsequentEvents" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SignificantAccountingPoliciesPolicies" roleURI="http://oceancapitalacquisitioncorporation.com/role/SignificantAccountingPoliciesPolicies" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SignificantAccountingPoliciesTables" roleURI="http://oceancapitalacquisitioncorporation.com/role/SignificantAccountingPoliciesTables" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#InitialPublicOfferingTables" roleURI="http://oceancapitalacquisitioncorporation.com/role/InitialPublicOfferingTables" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#FairValueMeasurementsTables" roleURI="http://oceancapitalacquisitioncorporation.com/role/FairValueMeasurementsTables" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SegmentReportingTables" roleURI="http://oceancapitalacquisitioncorporation.com/role/SegmentReportingTables" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#DescriptionOfOrganizationBusinessOperationsAndGoingConcernDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/DescriptionOfOrganizationBusinessOperationsAndGoingConcernDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#ScheduleOfNetLossPerSharePresentedInStatementOfOperationsDetails" roleURI="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfNetLossPerSharePresentedInStatementOfOperationsDetails" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#ScheduleOfNetLossPerShareDetails" roleURI="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfNetLossPerShareDetails" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SignificantAccountingPoliciesDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/SignificantAccountingPoliciesDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#ScheduleOfOrdinarySharesReflectedOnBalanceSheetDetails" roleURI="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfOrdinarySharesReflectedOnBalanceSheetDetails" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#InitialPublicOfferingDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/InitialPublicOfferingDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#PrivatePlacementDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/PrivatePlacementDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#RelatedPartyTransactionsDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/RelatedPartyTransactionsDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#RedeemableOrdinarySharesAndShareholdersDeficitDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/RedeemableOrdinarySharesAndShareholdersDeficitDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#CommitmentsAndContingenciesDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/CommitmentsAndContingenciesDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#ScheduleOfMeasuredFairValueOnRecurringBasisDetails" roleURI="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfMeasuredFairValueOnRecurringBasisDetails" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#ScheduleOfSegmentAssetsReportedOnBalanceSheetDetails" roleURI="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfSegmentAssetsReportedOnBalanceSheetDetails" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SegmentReportingDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/SegmentReportingDetailsNarrative" />
    <link:roleRef xlink:type="simple" xlink:href="ocac-20260630.xsd#SubsequentEventsDetailsNarrative" roleURI="http://oceancapitalacquisitioncorporation.com/role/SubsequentEventsDetailsNarrative" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/Cover" xlink:title="00000001 - Document - Cover" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/BalanceSheets" xlink:title="00000002 - Statement - Balance Sheets">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaapAssetsCurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Cash" xlink:label="loc_us-gaapCash" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapCash" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaapPrepaidExpenseCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapPrepaidExpenseCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsHeldInTrustNoncurrent" xlink:label="loc_us-gaapAssetsHeldInTrustNoncurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapAssetsHeldInTrustNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredCosts" xlink:label="loc_us-gaapDeferredCosts" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapDeferredCosts" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaapLiabilitiesCurrent" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaapAccruedLiabilitiesCurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapAccruedLiabilitiesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaapOtherLiabilitiesCurrent" />
      <link:calculationArc order="3" 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="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaapLiabilitiesNoncurrent" />
      <link:loc xlink:type="locator" xlink:href="ocac-20260630.xsd#OCAC_DeferredUnderwritingCommission" xlink:label="loc_OCACDeferredUnderwritingCommission" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_OCACDeferredUnderwritingCommission" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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/2026/elts/us-gaap-2026.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="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaapRetainedEarningsAccumulatedDeficit" />
      <link:calculationArc order="3" 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/2026/elts/us-gaap-2026.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/2026/elts/us-gaap-2026.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:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent" xlink:label="loc_us-gaapTemporaryEquityCarryingAmountAttributableToParent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapTemporaryEquityCarryingAmountAttributableToParent" xlink:type="arc" weight="1" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapStockholdersEquity" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/BalanceSheetsParenthetical" xlink:title="00000003 - Statement - Balance Sheets (Parenthetical)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/StatementsOfOperations" xlink:title="00000004 - Statement - Statements of Operations">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaapGeneralAndAdministrativeExpense" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLoss" xlink:to="loc_us-gaapGeneralAndAdministrativeExpense" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaapInvestmentIncomeInterest" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLoss" xlink:to="loc_us-gaapInvestmentIncomeInterest" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/StatementsOfChangesInShareholdersDeficit" xlink:title="00000005 - Statement - Statements of Changes in Shareholders&apos; Deficit" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/StatementsOfCashFlows" xlink:title="00000006 - Statement - Statements of Cash Flows">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperating" xlink:label="loc_us-gaapInterestAndDividendIncomeOperating" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapInterestAndDividendIncomeOperating" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="ocac-20260630.xsd#OCAC_GeneralAndAdministrativeExpensesPaidByRelatedParty" xlink:label="loc_OCACGeneralAndAdministrativeExpensesPaidByRelatedParty" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_OCACGeneralAndAdministrativeExpensesPaidByRelatedParty" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidExpense" xlink:label="loc_us-gaapIncreaseDecreaseInPrepaidExpense" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInPrepaidExpense" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaapIncreaseDecreaseInAccruedLiabilities" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInAccruedLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDueToRelatedParties" xlink:label="loc_us-gaapIncreaseDecreaseInDueToRelatedParties" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" xlink:to="loc_us-gaapIncreaseDecreaseInDueToRelatedParties" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInInvestingActivities" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment" xlink:label="loc_us-gaapPaymentsToAcquireTradingSecuritiesHeldforinvestment" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivities" xlink:to="loc_us-gaapPaymentsToAcquireTradingSecuritiesHeldforinvestment" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfPrivatePlacement" xlink:label="loc_us-gaapProceedsFromIssuanceOfPrivatePlacement" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapProceedsFromIssuanceOfPrivatePlacement" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromNotesPayable" xlink:label="loc_us-gaapProceedsFromNotesPayable" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapProceedsFromNotesPayable" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="loc_us-gaapProceedsFromIssuanceInitialPublicOffering" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapProceedsFromIssuanceInitialPublicOffering" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="ocac-20260630.xsd#OCAC_PaymentOfOfferingCosts" xlink:label="loc_OCACPaymentOfOfferingCosts" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_OCACPaymentOfOfferingCosts" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfNotesPayable" xlink:label="loc_us-gaapRepaymentsOfNotesPayable" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivities" xlink:to="loc_us-gaapRepaymentsOfNotesPayable" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure" xlink:title="00000012 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure" />
    <link:calculationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cyd/role/MaterialCybersecurityIncidentDisclosure" xlink:title="00000013 - Disclosure - Material Cybersecurity Incident Disclosure" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/DescriptionOfOrganizationBusinessOperationsAndGoingConcern" xlink:title="999014 - Disclosure - DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS AND GOING CONCERN" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SignificantAccountingPolicies" xlink:title="999015 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/InitialPublicOffering" xlink:title="999016 - Disclosure - INITIAL PUBLIC OFFERING" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/PrivatePlacement" xlink:title="999017 - Disclosure - PRIVATE PLACEMENT" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/RelatedPartyTransactions" xlink:title="999018 - Disclosure - RELATED PARTY TRANSACTIONS" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/RedeemableOrdinarySharesAndShareholdersDeficit" xlink:title="999019 - Disclosure - REDEEMABLE ORDINARY SHARES AND SHAREHOLDERS&#8217; DEFICIT" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/CommitmentsAndContingencies" xlink:title="999020 - Disclosure - COMMITMENTS AND CONTINGENCIES" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/FairValueMeasurements" xlink:title="999021 - Disclosure - FAIR VALUE MEASUREMENTS" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SegmentReporting" xlink:title="999022 - Disclosure - SEGMENT REPORTING" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SubsequentEvents" xlink:title="999023 - Disclosure - SUBSEQUENT EVENTS" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SignificantAccountingPoliciesPolicies" xlink:title="999024 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SignificantAccountingPoliciesTables" xlink:title="999025 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/InitialPublicOfferingTables" xlink:title="999026 - Disclosure - INITIAL PUBLIC OFFERING (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/FairValueMeasurementsTables" xlink:title="999027 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SegmentReportingTables" xlink:title="999028 - Disclosure - SEGMENT REPORTING (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/DescriptionOfOrganizationBusinessOperationsAndGoingConcernDetailsNarrative" xlink:title="999029 - Disclosure - DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS AND GOING CONCERN (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfNetLossPerSharePresentedInStatementOfOperationsDetails" xlink:title="999030 - Disclosure - SCHEDULE OF NET LOSS PER SHARE PRESENTED IN STATEMENT OF OPERATIONS (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaapNetIncomeLossAvailableToCommonStockholdersBasic" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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-gaapNetIncomeLossAvailableToCommonStockholdersBasic" xlink:to="loc_us-gaapNetIncomeLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment" xlink:label="loc_us-gaapTemporaryEquityAccretionToRedemptionValueAdjustment" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLossAvailableToCommonStockholdersBasic" xlink:to="loc_us-gaapTemporaryEquityAccretionToRedemptionValueAdjustment" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfNetLossPerShareDetails" xlink:title="999031 - Disclosure - SCHEDULE OF NET LOSS PER SHARE (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SignificantAccountingPoliciesDetailsNarrative" xlink:title="999032 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfOrdinarySharesReflectedOnBalanceSheetDetails" xlink:title="999033 - Disclosure - SCHEDULE OF ORDINARY SHARES REFLECTED ON BALANCE SHEET (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/InitialPublicOfferingDetailsNarrative" xlink:title="999034 - Disclosure - INITIAL PUBLIC OFFERING (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/PrivatePlacementDetailsNarrative" xlink:title="999035 - Disclosure - PRIVATE PLACEMENT (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/RelatedPartyTransactionsDetailsNarrative" xlink:title="999036 - Disclosure - RELATED PARTY TRANSACTIONS (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/RedeemableOrdinarySharesAndShareholdersDeficitDetailsNarrative" xlink:title="999037 - Disclosure - REDEEMABLE ORDINARY SHARES AND SHAREHOLDERS&#8217; DEFICIT (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/CommitmentsAndContingenciesDetailsNarrative" xlink:title="999038 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfMeasuredFairValueOnRecurringBasisDetails" xlink:title="999039 - Disclosure - SCHEDULE OF MEASURED FAIR VALUE ON RECURRING BASIS (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/ScheduleOfSegmentAssetsReportedOnBalanceSheetDetails" xlink:title="999040 - Disclosure - SCHEDULE OF SEGMENT ASSETS REPORTED ON BALANCE SHEET (Details)">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaapGeneralAndAdministrativeExpense" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLoss" xlink:to="loc_us-gaapGeneralAndAdministrativeExpense" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaapInvestmentIncomeInterest" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLoss" xlink:to="loc_us-gaapInvestmentIncomeInterest" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SegmentReportingDetailsNarrative" xlink:title="999041 - Disclosure - SEGMENT REPORTING (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://oceancapitalacquisitioncorporation.com/role/SubsequentEventsDetailsNarrative" xlink:title="999042 - Disclosure - SUBSEQUENT EVENTS (Details Narrative)" />
</link:linkbase>
