<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fa3be-a9e3-7105-8b28-741eae5bfde3,g:3edc10bd-7cca-496a-bc37-0350ef4e5a79-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="https://xbrl.org/2023/arcrole/summation-item" xlink:type="simple" xlink:href="https://www.xbrl.org/2023/calculation-1.1.xsd#summation-item"/>
  <link:roleRef roleURI="http://www.qtimaging.com/role/CondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="qti-20260630.xsd#CondensedConsolidatedBalanceSheets"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019fa3be-ab4b-76f3-ab9a-92f4f3827dee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019fa3be-ab4b-7b6b-90c1-61a4feeb9e5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fa3be-ab4b-76f3-ab9a-92f4f3827dee" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019fa3be-ab4b-7b6b-90c1-61a4feeb9e5d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019fa3be-ab4b-7592-ba48-f0419c06229f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fa3be-ab4b-76f3-ab9a-92f4f3827dee" xlink:to="loc_us-gaap_InventoryNet_019fa3be-ab4b-7592-ba48-f0419c06229f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019fa3be-ab4b-7178-bf51-d98d8c34f59e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fa3be-ab4b-76f3-ab9a-92f4f3827dee" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019fa3be-ab4b-7178-bf51-d98d8c34f59e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019fa3be-ab4b-7957-a50d-7b54738d8169" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fa3be-ab4b-76f3-ab9a-92f4f3827dee" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019fa3be-ab4b-7957-a50d-7b54738d8169" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fa3be-ab4b-7cbd-af23-6b571c1f26e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fa3be-ab4b-76f3-ab9a-92f4f3827dee" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fa3be-ab4b-7cbd-af23-6b571c1f26e7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fa3be-ab4b-7dd2-b004-e6e948baaf74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019fa3be-ab4b-7b1a-8e5d-a99bf5202e98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa3be-ab4b-7dd2-b004-e6e948baaf74" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019fa3be-ab4b-7b1a-8e5d-a99bf5202e98" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_WarrantLiabilityNoncurrent_019fa3be-ab4b-7fbd-9914-64af58d3f2ef" xlink:href="qti-20260630.xsd#qti_WarrantLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa3be-ab4b-7dd2-b004-e6e948baaf74" xlink:to="loc_qti_WarrantLiabilityNoncurrent_019fa3be-ab4b-7fbd-9914-64af58d3f2ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_ReverseRecapitalizationContingentConsiderationLiability_019fa3be-ab4b-79ad-a2e6-d5d8a88ef6a3" xlink:href="qti-20260630.xsd#qti_ReverseRecapitalizationContingentConsiderationLiability"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa3be-ab4b-7dd2-b004-e6e948baaf74" xlink:to="loc_qti_ReverseRecapitalizationContingentConsiderationLiability_019fa3be-ab4b-79ad-a2e6-d5d8a88ef6a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_LongTermDebtExcludingCurrentMaturitiesAndNotesPayable_019fa3be-ab4b-721b-9753-e06f102540f0" xlink:href="qti-20260630.xsd#qti_LongTermDebtExcludingCurrentMaturitiesAndNotesPayable"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa3be-ab4b-7dd2-b004-e6e948baaf74" xlink:to="loc_qti_LongTermDebtExcludingCurrentMaturitiesAndNotesPayable_019fa3be-ab4b-721b-9753-e06f102540f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019fa3be-ab4b-7772-bd2d-af72bf1d1e64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa3be-ab4b-7dd2-b004-e6e948baaf74" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019fa3be-ab4b-7772-bd2d-af72bf1d1e64" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermNotesPayable_019fa3be-ab4b-7368-bbe6-c878050fb276" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermNotesPayable"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa3be-ab4b-7dd2-b004-e6e948baaf74" xlink:to="loc_us-gaap_LongTermNotesPayable_019fa3be-ab4b-7368-bbe6-c878050fb276" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019fa3be-ab4b-71cb-ae33-90ee0746a353" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa3be-ab4b-7dd2-b004-e6e948baaf74" xlink:to="loc_us-gaap_LiabilitiesCurrent_019fa3be-ab4b-71cb-ae33-90ee0746a353" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019fa3be-ab4b-7272-8297-734fea75b401" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa3be-ab4b-790c-8260-eabb84f13ffd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa3be-ab4b-7272-8297-734fea75b401" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa3be-ab4b-790c-8260-eabb84f13ffd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019fa3be-ab4b-7fe8-9a00-9adcc32b2f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa3be-ab4b-7272-8297-734fea75b401" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019fa3be-ab4b-7fe8-9a00-9adcc32b2f8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019fa3be-ab4b-7c00-a255-8c9a2c93c3c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa3be-ab4b-7272-8297-734fea75b401" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019fa3be-ab4b-7c00-a255-8c9a2c93c3c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019fa3be-ab4b-70a0-934f-3b52f8c6ce25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa3be-ab4b-7272-8297-734fea75b401" xlink:to="loc_us-gaap_AssetsCurrent_019fa3be-ab4b-70a0-934f-3b52f8c6ce25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa3be-ab4b-7a04-b73c-718f3a4f125c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fa3be-ab4b-7b54-9dba-92c265838bc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa3be-ab4b-7a04-b73c-718f3a4f125c" xlink:to="loc_us-gaap_Liabilities_019fa3be-ab4b-7b54-9dba-92c265838bc5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019fa3be-ab4b-7ee0-8ec9-806d31eba56f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa3be-ab4b-7a04-b73c-718f3a4f125c" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019fa3be-ab4b-7ee0-8ec9-806d31eba56f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fa3be-ab4b-7092-9dcb-08417ce9c4a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa3be-ab4b-7a04-b73c-718f3a4f125c" xlink:to="loc_us-gaap_StockholdersEquity_019fa3be-ab4b-7092-9dcb-08417ce9c4a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019fa3be-ab4b-7907-949c-204fcb0b7e76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_019fa3be-ab4b-7c88-9f76-4025d6b5a960" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fa3be-ab4b-7907-949c-204fcb0b7e76" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_019fa3be-ab4b-7c88-9f76-4025d6b5a960" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_019fa3be-ab4b-718f-9681-ba4aa767a1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fa3be-ab4b-7907-949c-204fcb0b7e76" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_019fa3be-ab4b-718f-9681-ba4aa767a1e7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019fa3be-ab4b-7717-b370-e261c20f4c44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fa3be-ab4b-7907-949c-204fcb0b7e76" xlink:to="loc_us-gaap_AccountsPayableCurrent_019fa3be-ab4b-7717-b370-e261c20f4c44" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_LongTermDebtCurrentMaturitiesExcludingNotesPayable_019fa3be-ab4b-771b-94b6-d1f6c2e40b21" xlink:href="qti-20260630.xsd#qti_LongTermDebtCurrentMaturitiesExcludingNotesPayable"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fa3be-ab4b-7907-949c-204fcb0b7e76" xlink:to="loc_qti_LongTermDebtCurrentMaturitiesExcludingNotesPayable_019fa3be-ab4b-771b-94b6-d1f6c2e40b21" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fa3be-ab4b-7aff-ad6b-a1712a412b77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019fa3be-ab4b-7980-b481-4506d4186d77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fa3be-ab4b-7aff-ad6b-a1712a412b77" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019fa3be-ab4b-7980-b481-4506d4186d77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fa3be-ab4b-7e78-99ea-a8286a21d4d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fa3be-ab4b-7aff-ad6b-a1712a412b77" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fa3be-ab4b-7e78-99ea-a8286a21d4d1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019fa3be-ab4b-7f91-a697-689ff272e204" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fa3be-ab4b-7aff-ad6b-a1712a412b77" xlink:to="loc_us-gaap_PreferredStockValue_019fa3be-ab4b-7f91-a697-689ff272e204" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019fa3be-ab4b-7edf-850b-58e047ed92e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fa3be-ab4b-7aff-ad6b-a1712a412b77" xlink:to="loc_us-gaap_CommonStockValue_019fa3be-ab4b-7edf-850b-58e047ed92e6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/CondensedConsolidatedStatementsofOperationsandComprehensiveLoss" xlink:type="simple" xlink:href="qti-20260630.xsd#CondensedConsolidatedStatementsofOperationsandComprehensiveLoss"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/CondensedConsolidatedStatementsofOperationsandComprehensiveLoss" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019fa3be-ab4b-74dc-b88e-cdd3fc3122cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019fa3be-ab4b-73f0-9f7b-389a3ba7fb34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_019fa3be-ab4b-74dc-b88e-cdd3fc3122cb" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019fa3be-ab4b-73f0-9f7b-389a3ba7fb34" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fa3be-ab4b-7faa-9d58-0fb40a7ea7c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_019fa3be-ab4b-74dc-b88e-cdd3fc3122cb" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fa3be-ab4b-7faa-9d58-0fb40a7ea7c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fad9c-023f-71a6-9ae8-c6225fc0d6b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019fad9c-023f-73fb-b40c-0f2940c148b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fad9c-023f-71a6-9ae8-c6225fc0d6b0" xlink:to="loc_us-gaap_OperatingIncomeLoss_019fad9c-023f-73fb-b40c-0f2940c148b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019fad9c-023f-7965-bba6-d1c51520212b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fad9c-023f-71a6-9ae8-c6225fc0d6b0" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019fad9c-023f-7965-bba6-d1c51520212b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019fa3be-ab4b-7922-a1ad-e2bd7daa189d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019fa3be-ab4b-7705-ae17-158ebd4c2578" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_019fa3be-ab4b-7922-a1ad-e2bd7daa189d" xlink:to="loc_us-gaap_GrossProfit_019fa3be-ab4b-7705-ae17-158ebd4c2578" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019fa3be-ab4b-7d5c-8871-169f2922e880" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_019fa3be-ab4b-7922-a1ad-e2bd7daa189d" xlink:to="loc_us-gaap_OperatingExpenses_019fa3be-ab4b-7d5c-8871-169f2922e880" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019fa3be-ab4b-736c-b41e-7c4dd9586c22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019fa3be-ab4b-71a0-9d90-f2bf1c126ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019fa3be-ab4b-736c-b41e-7c4dd9586c22" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019fa3be-ab4b-71a0-9d90-f2bf1c126ee7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019fcd27-cd65-7d25-8d5b-898bb334018c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019fa3be-ab4b-736c-b41e-7c4dd9586c22" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019fcd27-cd65-7d25-8d5b-898bb334018c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_019fa3be-ab4b-787f-82e4-c30a9e36c71d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAdjustmentOfWarrants"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019fa3be-ab4b-736c-b41e-7c4dd9586c22" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_019fa3be-ab4b-787f-82e4-c30a9e36c71d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019fa3be-ab4b-76de-a9ff-7892395916a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019fa3be-ab4b-736c-b41e-7c4dd9586c22" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019fa3be-ab4b-76de-a9ff-7892395916a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_FairValueAdjustmentOfEarnoutLiability_019fa3be-ab4b-7f76-a29f-4ccf8da28173" xlink:href="qti-20260630.xsd#qti_FairValueAdjustmentOfEarnoutLiability"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019fa3be-ab4b-736c-b41e-7c4dd9586c22" xlink:to="loc_qti_FairValueAdjustmentOfEarnoutLiability_019fa3be-ab4b-7f76-a29f-4ccf8da28173" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019fa40a-c1dc-7fe5-b186-ee24b11fd588" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019fa3be-ab4b-736c-b41e-7c4dd9586c22" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019fa40a-c1dc-7fe5-b186-ee24b11fd588" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InducedConversionOfConvertibleDebtExpense_019fb850-9cc7-74c2-9e6e-44e9cd0a3847" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InducedConversionOfConvertibleDebtExpense"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019fa3be-ab4b-736c-b41e-7c4dd9586c22" xlink:to="loc_us-gaap_InducedConversionOfConvertibleDebtExpense_019fb850-9cc7-74c2-9e6e-44e9cd0a3847" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019fa3be-ab4b-7548-8822-bcc68d4d7696" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019fa3be-ab4b-7e6d-8373-0ce63c8262a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa3be-ab4b-7548-8822-bcc68d4d7696" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019fa3be-ab4b-7e6d-8373-0ce63c8262a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019fa3be-ab4b-7a0d-bee3-84846c9c90c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa3be-ab4b-7548-8822-bcc68d4d7696" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019fa3be-ab4b-7a0d-bee3-84846c9c90c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fb189-c789-7f6e-b4cf-39fdfffb3f3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fb189-c789-725c-b64f-8faeb108af0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019fb189-c789-7f6e-b4cf-39fdfffb3f3c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fb189-c789-725c-b64f-8faeb108af0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019fb189-c789-7277-a29b-b63e9d098b49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019fb189-c789-7f6e-b4cf-39fdfffb3f3c" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019fb189-c789-7277-a29b-b63e9d098b49" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="qti-20260630.xsd#CondensedConsolidatedStatementsofCashFlows"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fcdff-ca8c-7df3-98eb-6a8bda9197cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fcdff-ca8c-742d-98cc-02d79b391414" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fcdff-ca8c-7df3-98eb-6a8bda9197cc" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fcdff-ca8c-742d-98cc-02d79b391414" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_019fcdff-ca8c-75fa-beef-06e414956792" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCash"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fcdff-ca8c-7df3-98eb-6a8bda9197cc" xlink:to="loc_us-gaap_RestrictedCash_019fcdff-ca8c-75fa-beef-06e414956792" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa3be-ab4b-7bb5-8c46-c7765cdf5c85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa3be-ab4b-7e7c-a685-61468ea345fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa3be-ab4b-7bb5-8c46-c7765cdf5c85" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa3be-ab4b-7e7c-a685-61468ea345fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7e30-b7ff-7aab20e06d91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa3be-ab4b-7bb5-8c46-c7765cdf5c85" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7e30-b7ff-7aab20e06d91" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa3be-ab4b-73ef-b889-5df565f16fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa3be-ab4b-7bb5-8c46-c7765cdf5c85" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa3be-ab4b-73ef-b889-5df565f16fa7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa3be-ab4b-79c5-8851-a601d65553b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019fa3be-ab4b-7bd3-984a-9761a27ef931" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa3be-ab4b-79c5-8851-a601d65553b0" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019fa3be-ab4b-7bd3-984a-9761a27ef931" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_FairValueAdjustmentOfEarnoutLiability_019fa3be-ab4b-7a7c-8fd3-f9ff815b7851" xlink:href="qti-20260630.xsd#qti_FairValueAdjustmentOfEarnoutLiability"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_qti_FairValueAdjustmentOfEarnoutLiability_019fa3be-ab4b-7a7c-8fd3-f9ff815b7851" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019fa3be-ab4b-74c8-9aa0-bf2dfc016925" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019fa3be-ab4b-74c8-9aa0-bf2dfc016925" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_NonCashOperatingLeaseIncomeExpense_019fa3be-ab4b-781d-b14f-078368150128" xlink:href="qti-20260630.xsd#qti_NonCashOperatingLeaseIncomeExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_qti_NonCashOperatingLeaseIncomeExpense_019fa3be-ab4b-781d-b14f-078368150128" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaidInKindInterest_019fa3be-ab4b-71e5-bf37-0c1e0fcdb7e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaidInKindInterest"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_PaidInKindInterest_019fa3be-ab4b-71e5-bf37-0c1e0fcdb7e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019fa3be-ab4b-7d51-9388-04c6fca7fc09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019fa3be-ab4b-7d51-9388-04c6fca7fc09" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_019fa3be-ab4b-7a28-898f-48562eb68412" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_019fa3be-ab4b-7a28-898f-48562eb68412" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019fa3be-ab4b-7b3d-9faf-9b9c13fd7ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019fa3be-ab4b-7b3d-9faf-9b9c13fd7ca3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_019fa3be-ab4b-74c2-9c26-84b0b8bc6330" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAdjustmentOfWarrants"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_019fa3be-ab4b-74c2-9c26-84b0b8bc6330" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fa3be-ab4b-7f94-955a-90233f031c4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_NetIncomeLoss_019fa3be-ab4b-7f94-955a-90233f031c4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019fa3be-ab4b-7756-9384-741df982b1fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_ShareBasedCompensation_019fa3be-ab4b-7756-9384-741df982b1fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_019fa3be-ab4b-709d-a4d6-a38af8258555" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherCurrentLiabilities"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_019fa3be-ab4b-709d-a4d6-a38af8258555" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_019fa3be-ab4b-77d5-b10e-ea60c952d2f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_019fa3be-ab4b-77d5-b10e-ea60c952d2f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019fa3be-ab4b-7594-babf-8a24dfa0deee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019fa3be-ab4b-7594-babf-8a24dfa0deee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019fa3be-ab4b-7f77-a78d-90569408205a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019fa3be-ab4b-7f77-a78d-90569408205a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InducedConversionOfConvertibleDebtExpense_019fa3be-ab4b-78c9-9ab3-07a914bd3352" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InducedConversionOfConvertibleDebtExpense"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_InducedConversionOfConvertibleDebtExpense_019fa3be-ab4b-78c9-9ab3-07a914bd3352" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019fadf6-1cd4-7073-8729-e991d6075d77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="16" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa3be-ab4b-7f9a-b28b-0f0b461b701c" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019fadf6-1cd4-7073-8729-e991d6075d77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa946-2b61-7534-8e50-6443f73037f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019fa946-2b61-7f53-be02-349d6a0f2536" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa946-2b61-7534-8e50-6443f73037f5" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019fa946-2b61-7f53-be02-349d6a0f2536" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_019fa946-2b61-785c-b919-d90ca38ed3ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa946-2b61-7534-8e50-6443f73037f5" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_019fa946-2b61-785c-b919-d90ca38ed3ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_019fa946-2b61-7850-a70b-587dd5766b11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa946-2b61-7534-8e50-6443f73037f5" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_019fa946-2b61-7850-a70b-587dd5766b11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019fa946-2b61-7465-aa71-42ce499a7c93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa946-2b61-7534-8e50-6443f73037f5" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019fa946-2b61-7465-aa71-42ce499a7c93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019fa946-2b61-70eb-9e2b-517879d690fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa946-2b61-7534-8e50-6443f73037f5" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019fa946-2b61-70eb-9e2b-517879d690fd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019fa946-2b61-763e-a1cc-f3b95016c700" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa946-2b61-7534-8e50-6443f73037f5" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019fa946-2b61-763e-a1cc-f3b95016c700" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_019faded-b0b0-7fae-b920-8aeb9a039ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa946-2b61-7534-8e50-6443f73037f5" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_019faded-b0b0-7fae-b920-8aeb9a039ec8" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/BalanceSheetDetailsScheduleofInventoryCurrentDetails" xlink:type="simple" xlink:href="qti-20260630.xsd#BalanceSheetDetailsScheduleofInventoryCurrentDetails"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/BalanceSheetDetailsScheduleofInventoryCurrentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019fa3be-ab4b-7c76-8381-221dee0db876" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_019fa3be-ab4b-7d47-ada2-951598dece0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryRawMaterialsNetOfReserves"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_019fa3be-ab4b-7c76-8381-221dee0db876" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_019fa3be-ab4b-7d47-ada2-951598dece0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_019fa3be-ab4b-715d-9ac0-076c957455b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryWorkInProcessNetOfReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_019fa3be-ab4b-7c76-8381-221dee0db876" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_019fa3be-ab4b-715d-9ac0-076c957455b4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_019fa3be-ab4b-7b06-bdc2-d4a775c080b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_019fa3be-ab4b-7c76-8381-221dee0db876" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_019fa3be-ab4b-7b06-bdc2-d4a775c080b7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/BalanceSheetDetailsScheduleofPrepaidExpenseandOtherCurrentAssetsDetails" xlink:type="simple" xlink:href="qti-20260630.xsd#BalanceSheetDetailsScheduleofPrepaidExpenseandOtherCurrentAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/BalanceSheetDetailsScheduleofPrepaidExpenseandOtherCurrentAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019fa3be-ab4b-75c7-8b7e-30d5957da8dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidInsurance_019fa3be-ab4b-7cdf-8037-4ef5cd69b03f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidInsurance"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019fa3be-ab4b-75c7-8b7e-30d5957da8dc" xlink:to="loc_us-gaap_PrepaidInsurance_019fa3be-ab4b-7cdf-8037-4ef5cd69b03f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_019fa3be-ab4b-7931-9316-20aaed9e89e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019fa3be-ab4b-75c7-8b7e-30d5957da8dc" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_019fa3be-ab4b-7931-9316-20aaed9e89e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPrepaidExpenseCurrent_019fa3be-ab4b-7e7f-b3f0-af15b11fcf57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPrepaidExpenseCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019fa3be-ab4b-75c7-8b7e-30d5957da8dc" xlink:to="loc_us-gaap_OtherPrepaidExpenseCurrent_019fa3be-ab4b-7e7f-b3f0-af15b11fcf57" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/BalanceSheetDetailsScheduleofPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="qti-20260630.xsd#BalanceSheetDetailsScheduleofPropertyPlantandEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/BalanceSheetDetailsScheduleofPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa3be-ab4b-7771-ae7d-92c10a72fe09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019fa3be-ab4b-7c62-badc-9327660ec174" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa3be-ab4b-7771-ae7d-92c10a72fe09" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019fa3be-ab4b-7c62-badc-9327660ec174" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019fa3be-ab4b-7f99-9b42-0604b4b68983" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa3be-ab4b-7771-ae7d-92c10a72fe09" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019fa3be-ab4b-7f99-9b42-0604b4b68983" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/BalanceSheetDetailsScheduleofAccountsPayableandAccruedLiabilitiesDetails" xlink:type="simple" xlink:href="qti-20260630.xsd#BalanceSheetDetailsScheduleofAccountsPayableandAccruedLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/BalanceSheetDetailsScheduleofAccountsPayableandAccruedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_019fa3be-ab4b-71d5-87b2-81b0230b1fae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationReserveCurrent_019fa3be-ab4b-740e-add9-0d8746b21915" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LitigationReserveCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fa3be-ab4b-71d5-87b2-81b0230b1fae" xlink:to="loc_us-gaap_LitigationReserveCurrent_019fa3be-ab4b-740e-add9-0d8746b21915" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_AccruedPersonnelCostsCurrent_019fa3be-ab4b-7929-b30c-0e8826055c45" xlink:href="qti-20260630.xsd#qti_AccruedPersonnelCostsCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fa3be-ab4b-71d5-87b2-81b0230b1fae" xlink:to="loc_qti_AccruedPersonnelCostsCurrent_019fa3be-ab4b-7929-b30c-0e8826055c45" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_AccruedPurchasesCurrent_019fa3be-ab4b-7024-b546-e6c4816ee923" xlink:href="qti-20260630.xsd#qti_AccruedPurchasesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fa3be-ab4b-71d5-87b2-81b0230b1fae" xlink:to="loc_qti_AccruedPurchasesCurrent_019fa3be-ab4b-7024-b546-e6c4816ee923" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenue_019fa3be-ab4b-7be0-aecc-5edd3a3d62b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredRevenue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fa3be-ab4b-71d5-87b2-81b0230b1fae" xlink:to="loc_us-gaap_DeferredRevenue_019fa3be-ab4b-7be0-aecc-5edd3a3d62b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_qti_OtherAccruedLiabilityCurrent_019fa3be-ab4b-76c6-a095-50477c4654cb" xlink:href="qti-20260630.xsd#qti_OtherAccruedLiabilityCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fa3be-ab4b-71d5-87b2-81b0230b1fae" xlink:to="loc_qti_OtherAccruedLiabilityCurrent_019fa3be-ab4b-76c6-a095-50477c4654cb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/LongTermDebtScheduleofMaturitiesofLongTermDebtDetails" xlink:type="simple" xlink:href="qti-20260630.xsd#LongTermDebtScheduleofMaturitiesofLongTermDebtDetails"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/LongTermDebtScheduleofMaturitiesofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019fa3be-ab4c-7f25-add2-5d45aaf3aa20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_019fa3be-ab4c-75e8-b8d0-aaa3973eab52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_019fa3be-ab4c-7f25-add2-5d45aaf3aa20" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_019fa3be-ab4c-75e8-b8d0-aaa3973eab52" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/LeasesScheduleofROUAssetsandLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="qti-20260630.xsd#LeasesScheduleofROUAssetsandLeaseLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/LeasesScheduleofROUAssetsandLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019fa3be-ab4c-77b8-ac28-bfec23b19d76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019fa3be-ab4c-7f9f-8391-5caab1f85376" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_019fa3be-ab4c-77b8-ac28-bfec23b19d76" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019fa3be-ab4c-7f9f-8391-5caab1f85376" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_019fa3be-ab4c-7cac-a26b-680936e549c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_019fa3be-ab4c-77b8-ac28-bfec23b19d76" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_019fa3be-ab4c-7cac-a26b-680936e549c3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/LeasesScheduleofMaturityofOperatingLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="qti-20260630.xsd#LeasesScheduleofMaturityofOperatingLeaseLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/LeasesScheduleofMaturityofOperatingLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fa3be-ab4c-7a57-991d-297e48b77d84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_019fa3be-ab4c-7b35-a735-afb48d63bc04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fa3be-ab4c-7a57-991d-297e48b77d84" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_019fa3be-ab4c-7b35-a735-afb48d63bc04" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019fa3be-ab4c-75ae-83fb-5637085c0205" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fa3be-ab4c-7a57-991d-297e48b77d84" xlink:to="loc_us-gaap_OperatingLeaseLiability_019fa3be-ab4c-75ae-83fb-5637085c0205" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.qtimaging.com/role/LeasesScheduleofMaturityofOperatingLeaseLiabilitiesDetails_1" xlink:type="simple" xlink:href="qti-20260630.xsd#LeasesScheduleofMaturityofOperatingLeaseLiabilitiesDetails_1"/>
  <link:calculationLink xlink:role="http://www.qtimaging.com/role/LeasesScheduleofMaturityofOperatingLeaseLiabilitiesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fa3be-ab4c-727e-aacd-170387b8f4f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_019fa3be-ab4c-797e-b0db-706ddee7b62c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fa3be-ab4c-727e-aacd-170387b8f4f9" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_019fa3be-ab4c-797e-b0db-706ddee7b62c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_019fa3be-ab4c-7045-9b7b-022a6695d61f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fa3be-ab4c-727e-aacd-170387b8f4f9" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_019fa3be-ab4c-7045-9b7b-022a6695d61f" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
