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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:4bf80b47-bff8-40a6-85e3-2d2fbe7aad54,g:d355ce8b-153c-496b-bf03-9e7d30803bce-->
<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:roleRef roleURI="http://www.viantinc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="dsp-20250930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_a218fc6c-99db-4748-8b4b-0027281dfd18" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_f0bf617a-6532-42e9-a630-8ac0368b7b30" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_a218fc6c-99db-4748-8b4b-0027281dfd18" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_f0bf617a-6532-42e9-a630-8ac0368b7b30" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_3dedb4a6-6063-4e96-bfa9-8723267e5a46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_a218fc6c-99db-4748-8b4b-0027281dfd18" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_3dedb4a6-6063-4e96-bfa9-8723267e5a46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_135b1354-ed7e-449a-8d1b-fcaccdc2552f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostsAndExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_01ef568d-6736-4a81-b48b-245fbe02a575" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_135b1354-ed7e-449a-8d1b-fcaccdc2552f" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_01ef568d-6736-4a81-b48b-245fbe02a575" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_5033f159-c32a-4408-a529-30dcfad631df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_135b1354-ed7e-449a-8d1b-fcaccdc2552f" xlink:to="loc_us-gaap_SellingAndMarketingExpense_5033f159-c32a-4408-a529-30dcfad631df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_TechnologyAndDevelopmentExpenses_4ccd0747-0702-41f1-bbf9-12393156b538" xlink:href="dsp-20250930.xsd#dsp_TechnologyAndDevelopmentExpenses"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_135b1354-ed7e-449a-8d1b-fcaccdc2552f" xlink:to="loc_dsp_TechnologyAndDevelopmentExpenses_4ccd0747-0702-41f1-bbf9-12393156b538" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_8585b74c-1f39-4786-9e53-b70c2834c8e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_135b1354-ed7e-449a-8d1b-fcaccdc2552f" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_8585b74c-1f39-4786-9e53-b70c2834c8e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_8094983b-8b02-4ca9-97e4-3fa23ecca1f1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest_e6c6869e-6f6e-4522-b2bf-139a436fb68b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8094983b-8b02-4ca9-97e4-3fa23ecca1f1" xlink:to="loc_us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest_e6c6869e-6f6e-4522-b2bf-139a436fb68b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_1223b734-3f94-41dc-811c-99d95953b7db" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8094983b-8b02-4ca9-97e4-3fa23ecca1f1" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_1223b734-3f94-41dc-811c-99d95953b7db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest_86907841-b28f-4b49-893e-a3ec7ee3c3d7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_ceacb73b-5cc2-4964-ba9e-1e849f2d5226" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest_86907841-b28f-4b49-893e-a3ec7ee3c3d7" xlink:to="loc_us-gaap_OperatingIncomeLoss_ceacb73b-5cc2-4964-ba9e-1e849f2d5226" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_04097794-afaa-40e2-90d9-809daf53b1e3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossIncludingPortionAttributableToNoncontrollingInterest_86907841-b28f-4b49-893e-a3ec7ee3c3d7" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_04097794-afaa-40e2-90d9-809daf53b1e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c6e6f0c7-1132-4fbe-b54c-8777a9033166" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1b805058-6994-49e0-8f76-5f518348d599" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c6e6f0c7-1132-4fbe-b54c-8777a9033166" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1b805058-6994-49e0-8f76-5f518348d599" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_9f7ddd2c-16f2-4d48-9565-ece7b18bc142" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostsAndExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c6e6f0c7-1132-4fbe-b54c-8777a9033166" xlink:to="loc_us-gaap_CostsAndExpenses_9f7ddd2c-16f2-4d48-9565-ece7b18bc142" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_42dc13ae-2dd0-4336-bcac-28e7604241db" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_079a33b2-dc56-41dd-976e-b0c6dcc990e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_42dc13ae-2dd0-4336-bcac-28e7604241db" xlink:to="loc_us-gaap_ProfitLoss_079a33b2-dc56-41dd-976e-b0c6dcc990e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_5ca8057a-5998-49ec-ae6e-5c8218fede56" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_42dc13ae-2dd0-4336-bcac-28e7604241db" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_5ca8057a-5998-49ec-ae6e-5c8218fede56" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="dsp-20250930.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_7539120a-98ff-4992-9692-683842e4b9a5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_5ac39e21-29fe-47c7-8ec6-08e657e7d615" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_7539120a-98ff-4992-9692-683842e4b9a5" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_5ac39e21-29fe-47c7-8ec6-08e657e7d615" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_943f1819-9526-4e0d-ab9b-9f6686c9e255" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_7539120a-98ff-4992-9692-683842e4b9a5" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_943f1819-9526-4e0d-ab9b-9f6686c9e255" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_562c08c6-2d01-41ab-b896-69a5a6ba93a1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_7539120a-98ff-4992-9692-683842e4b9a5" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_562c08c6-2d01-41ab-b896-69a5a6ba93a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_458dd12a-6a72-4a62-8908-77428039864a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_ff2712dc-1dfe-420e-a4b7-a72aa3407962" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_458dd12a-6a72-4a62-8908-77428039864a" xlink:to="loc_us-gaap_AdditionalPaidInCapital_ff2712dc-1dfe-420e-a4b7-a72aa3407962" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_373c1701-52c7-4ff8-a7d7-7c538d76df6b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_458dd12a-6a72-4a62-8908-77428039864a" xlink:to="loc_us-gaap_CommonStockValue_373c1701-52c7-4ff8-a7d7-7c538d76df6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_f2e1c520-6284-4185-8e3f-4100c5f470be" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_458dd12a-6a72-4a62-8908-77428039864a" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_f2e1c520-6284-4185-8e3f-4100c5f470be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_3e0b8e35-8cbe-4bcb-b054-d04f27de7a09" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockValue"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_458dd12a-6a72-4a62-8908-77428039864a" xlink:to="loc_us-gaap_TreasuryStockValue_3e0b8e35-8cbe-4bcb-b054-d04f27de7a09" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_6d728ab6-058b-46e9-a579-f1ee7281979d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_458dd12a-6a72-4a62-8908-77428039864a" xlink:to="loc_us-gaap_PreferredStockValue_6d728ab6-058b-46e9-a579-f1ee7281979d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_913ca7b7-4b56-476f-9ff2-f0f2e4eb1781" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_3b522a98-bcc3-4fa9-a8ef-939f0762e3cf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_913ca7b7-4b56-476f-9ff2-f0f2e4eb1781" xlink:to="loc_us-gaap_AssetsCurrent_3b522a98-bcc3-4fa9-a8ef-939f0762e3cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_fa2adefa-6b80-424d-9994-27e97f289056" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_913ca7b7-4b56-476f-9ff2-f0f2e4eb1781" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_fa2adefa-6b80-424d-9994-27e97f289056" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_5e2a5d58-16b2-4af1-a2ad-5e60768f0505" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_913ca7b7-4b56-476f-9ff2-f0f2e4eb1781" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_5e2a5d58-16b2-4af1-a2ad-5e60768f0505" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_cfa8f1dc-7575-4aa4-8ec7-597fb35bce93" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_913ca7b7-4b56-476f-9ff2-f0f2e4eb1781" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_cfa8f1dc-7575-4aa4-8ec7-597fb35bce93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_9b238b54-a827-4126-8ade-5ce18f41bcf0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_913ca7b7-4b56-476f-9ff2-f0f2e4eb1781" xlink:to="loc_us-gaap_Goodwill_9b238b54-a827-4126-8ade-5ce18f41bcf0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_03739aed-4e24-48fc-ba87-a815d5519267" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_913ca7b7-4b56-476f-9ff2-f0f2e4eb1781" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_03739aed-4e24-48fc-ba87-a815d5519267" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_41109221-8525-459f-a5f8-1cf0f8a780b0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_5c8a41f7-6491-45dc-a624-5413e3b052df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_41109221-8525-459f-a5f8-1cf0f8a780b0" xlink:to="loc_us-gaap_Liabilities_5c8a41f7-6491-45dc-a624-5413e3b052df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_525c8e91-dac3-488a-8aad-c95869612ae7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_41109221-8525-459f-a5f8-1cf0f8a780b0" xlink:to="loc_us-gaap_CommitmentsAndContingencies_525c8e91-dac3-488a-8aad-c95869612ae7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2ff322f2-5e56-42b8-a180-b2ae80483219" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_41109221-8525-459f-a5f8-1cf0f8a780b0" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2ff322f2-5e56-42b8-a180-b2ae80483219" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_19d6cc63-9d99-4ec2-9b4b-1725afc4ba88" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_7b9b908d-cfa8-4ef9-9308-62ddf24cb426" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_19d6cc63-9d99-4ec2-9b4b-1725afc4ba88" xlink:to="loc_us-gaap_AccountsPayableCurrent_7b9b908d-cfa8-4ef9-9308-62ddf24cb426" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_e079840a-1d6c-4e4f-99a9-8fafee50309b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_19d6cc63-9d99-4ec2-9b4b-1725afc4ba88" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_e079840a-1d6c-4e4f-99a9-8fafee50309b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedSalariesCurrent_e28d7136-4b75-4247-a64d-d9db929a7595" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccruedSalariesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_19d6cc63-9d99-4ec2-9b4b-1725afc4ba88" xlink:to="loc_us-gaap_AccruedSalariesCurrent_e28d7136-4b75-4247-a64d-d9db929a7595" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_3bdc5d3b-a7dc-446a-8916-d03bcf4921d3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_19d6cc63-9d99-4ec2-9b4b-1725afc4ba88" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_3bdc5d3b-a7dc-446a-8916-d03bcf4921d3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_344980e0-d0f3-45e5-b33c-3c9e8a5cd44d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_19d6cc63-9d99-4ec2-9b4b-1725afc4ba88" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_344980e0-d0f3-45e5-b33c-3c9e8a5cd44d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_088ae231-55d0-48e2-9f65-f7288e0f841c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_19d6cc63-9d99-4ec2-9b4b-1725afc4ba88" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_088ae231-55d0-48e2-9f65-f7288e0f841c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_4c97721a-a62f-4c4d-ab51-00c30578a173" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_7701e52f-add7-405e-b59e-0e2a898b58c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c97721a-a62f-4c4d-ab51-00c30578a173" xlink:to="loc_us-gaap_LiabilitiesCurrent_7701e52f-add7-405e-b59e-0e2a898b58c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_37a8d359-dba3-4acb-bc07-746ebc0b8e67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c97721a-a62f-4c4d-ab51-00c30578a173" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_37a8d359-dba3-4acb-bc07-746ebc0b8e67" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_085193a2-4a1e-484e-a365-0231468467fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c97721a-a62f-4c4d-ab51-00c30578a173" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_085193a2-4a1e-484e-a365-0231468467fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_349b0c09-c5bf-4a12-932d-ebbe036c337e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_131d28b5-b3ed-406d-88ef-7359f9537cc1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_349b0c09-c5bf-4a12-932d-ebbe036c337e" xlink:to="loc_us-gaap_StockholdersEquity_131d28b5-b3ed-406d-88ef-7359f9537cc1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_d75dd950-53d3-4186-809a-7f0bbf1071cb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MinorityInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_349b0c09-c5bf-4a12-932d-ebbe036c337e" xlink:to="loc_us-gaap_MinorityInterest_d75dd950-53d3-4186-809a-7f0bbf1071cb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="dsp-20250930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_92110d70-8de1-4562-9ae3-749268686994" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_299c179d-c9e8-46e0-8d51-3fa631e0e840" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_92110d70-8de1-4562-9ae3-749268686994" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_299c179d-c9e8-46e0-8d51-3fa631e0e840" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToDevelopSoftware_8be8e345-7d0d-4572-a0d7-208621d999e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToDevelopSoftware"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_92110d70-8de1-4562-9ae3-749268686994" xlink:to="loc_us-gaap_PaymentsToDevelopSoftware_8be8e345-7d0d-4572-a0d7-208621d999e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_c4cc80da-b99b-41c7-adac-81b6bc70f0cf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_92110d70-8de1-4562-9ae3-749268686994" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_c4cc80da-b99b-41c7-adac-81b6bc70f0cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_a79d1ca1-61e2-4ca4-8328-37dcda098226" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireInvestments"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_92110d70-8de1-4562-9ae3-749268686994" xlink:to="loc_us-gaap_PaymentsToAcquireInvestments_a79d1ca1-61e2-4ca4-8328-37dcda098226" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_401d906f-1d88-4931-8874-070cb65d37d4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_ProfitLoss_401d906f-1d88-4931-8874-070cb65d37d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_4bd8fc37-a2e5-4650-ac4a-e874057ec6eb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_4bd8fc37-a2e5-4650-ac4a-e874057ec6eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_66f7348c-532a-429c-b14d-ee0ddf13b0b7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_ShareBasedCompensation_66f7348c-532a-429c-b14d-ee0ddf13b0b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_4707a1eb-3f8d-494c-8b72-1156084032ed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_4707a1eb-3f8d-494c-8b72-1156084032ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_7a0f65a0-e235-4a8f-823b-704461073b3d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_7a0f65a0-e235-4a8f-823b-704461073b3d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_c15a5c7b-1bdf-4d93-b78e-fafd24d6ceeb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_c15a5c7b-1bdf-4d93-b78e-fafd24d6ceeb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_92366c86-65ca-4cf4-8fca-536aa898fa5e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_92366c86-65ca-4cf4-8fca-536aa898fa5e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_f755b648-5d03-400b-99c2-b45d4defb6b7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_f755b648-5d03-400b-99c2-b45d4defb6b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_cc27528c-3f4f-4353-afab-e4a7f130bd57" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_cc27528c-3f4f-4353-afab-e4a7f130bd57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_b8d1f783-35a1-4816-8553-10d645b4154f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_b8d1f783-35a1-4816-8553-10d645b4154f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_IncreaseDecreaseInAccruedCompensation_425bab72-ee5d-4f73-aadb-c3d9c88d2db5" xlink:href="dsp-20250930.xsd#dsp_IncreaseDecreaseInAccruedCompensation"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_dsp_IncreaseDecreaseInAccruedCompensation_425bab72-ee5d-4f73-aadb-c3d9c88d2db5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_13a62384-2775-431c-9a18-9894ec572008" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_13a62384-2775-431c-9a18-9894ec572008" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_617b7da1-8485-46ed-a615-59bd6968dc48" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_617b7da1-8485-46ed-a615-59bd6968dc48" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_6dc6af4e-a934-4e59-b678-4d0abb4db1df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_87546d55-f29d-4b11-9fa0-e49786d6a406" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_6dc6af4e-a934-4e59-b678-4d0abb4db1df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d9db03f5-b746-48d1-97fe-1e31936f7a79" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_96be9aba-96d2-42be-bceb-aaa0ac70eef1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d9db03f5-b746-48d1-97fe-1e31936f7a79" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_96be9aba-96d2-42be-bceb-aaa0ac70eef1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_9de068ed-ce4b-4831-937f-1ebaac05c58a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d9db03f5-b746-48d1-97fe-1e31936f7a79" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_9de068ed-ce4b-4831-937f-1ebaac05c58a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfInitialPublicOffering_75064a1a-4636-4376-8ec0-f1c93afbdeb2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForRepurchaseOfInitialPublicOffering"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d9db03f5-b746-48d1-97fe-1e31936f7a79" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfInitialPublicOffering_75064a1a-4636-4376-8ec0-f1c93afbdeb2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_PaymentOfMemberTaxDistributions_32d9a313-5ca0-436f-96a8-8f8bcdefd1ba" xlink:href="dsp-20250930.xsd#dsp_PaymentOfMemberTaxDistributions"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d9db03f5-b746-48d1-97fe-1e31936f7a79" xlink:to="loc_dsp_PaymentOfMemberTaxDistributions_32d9a313-5ca0-436f-96a8-8f8bcdefd1ba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_PaymentTaxWithholdingShareBasedPaymentArrangementShareRepurchaseProgram_eabd850e-0119-4d10-9f34-d7810babd66d" xlink:href="dsp-20250930.xsd#dsp_PaymentTaxWithholdingShareBasedPaymentArrangementShareRepurchaseProgram"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d9db03f5-b746-48d1-97fe-1e31936f7a79" xlink:to="loc_dsp_PaymentTaxWithholdingShareBasedPaymentArrangementShareRepurchaseProgram_eabd850e-0119-4d10-9f34-d7810babd66d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_4af4bd1b-a243-4724-96aa-b0d1cd375da3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4f5bb8dd-4f30-4bb3-a1ec-6edf512ae4c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_4af4bd1b-a243-4724-96aa-b0d1cd375da3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4f5bb8dd-4f30-4bb3-a1ec-6edf512ae4c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_fa87e7da-76fb-41fc-a5b0-004347598caa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_4af4bd1b-a243-4724-96aa-b0d1cd375da3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_fa87e7da-76fb-41fc-a5b0-004347598caa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e689a6dc-ea81-4e4f-adb7-f9c49b49d2bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_4af4bd1b-a243-4724-96aa-b0d1cd375da3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e689a6dc-ea81-4e4f-adb7-f9c49b49d2bf" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/PropertyEquipmentandSoftwareNetScheduleofMajorClassesofPropertyEquipmentandSoftwareDetails" xlink:type="simple" xlink:href="dsp-20250930.xsd#PropertyEquipmentandSoftwareNetScheduleofMajorClassesofPropertyEquipmentandSoftwareDetails"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/PropertyEquipmentandSoftwareNetScheduleofMajorClassesofPropertyEquipmentandSoftwareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_85e19bc5-fd9f-4325-8cc5-4ddd35fed3c1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_c7e88f1f-b448-4a1c-9688-1c8317b18a32" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_85e19bc5-fd9f-4325-8cc5-4ddd35fed3c1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_c7e88f1f-b448-4a1c-9688-1c8317b18a32" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_7593733d-d249-46e4-9a95-ad6cbc54994d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_85e19bc5-fd9f-4325-8cc5-4ddd35fed3c1" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_7593733d-d249-46e4-9a95-ad6cbc54994d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/LeasesComponentsofLeaseExpenseDetails" xlink:type="simple" xlink:href="dsp-20250930.xsd#LeasesComponentsofLeaseExpenseDetails"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/LeasesComponentsofLeaseExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_f10a378d-6d0d-412b-9913-94a1ccccb44c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_9501e909-57c2-48b6-bc4f-e1edf9077605" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_f10a378d-6d0d-412b-9913-94a1ccccb44c" xlink:to="loc_us-gaap_OperatingLeaseCost_9501e909-57c2-48b6-bc4f-e1edf9077605" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_d4a3b78b-c079-4181-9acf-fbb20c7890e2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_f10a378d-6d0d-412b-9913-94a1ccccb44c" xlink:to="loc_us-gaap_ShortTermLeaseCost_d4a3b78b-c079-4181-9acf-fbb20c7890e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_6abbf507-fd07-4365-bf82-c44aac0948b4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_f10a378d-6d0d-412b-9913-94a1ccccb44c" xlink:to="loc_us-gaap_VariableLeaseCost_6abbf507-fd07-4365-bf82-c44aac0948b4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/LeasesSummaryofFutureMinimumLeasePaymentsDetails" xlink:type="simple" xlink:href="dsp-20250930.xsd#LeasesSummaryofFutureMinimumLeasePaymentsDetails"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/LeasesSummaryofFutureMinimumLeasePaymentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5c0eda45-7d82-40f4-8024-db3a2397fecb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_74fd862e-43aa-44fa-bcb9-b2ba46ddeca1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5c0eda45-7d82-40f4-8024-db3a2397fecb" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_74fd862e-43aa-44fa-bcb9-b2ba46ddeca1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_efbee6f9-7988-4921-be6e-e69cd3894fff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5c0eda45-7d82-40f4-8024-db3a2397fecb" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_efbee6f9-7988-4921-be6e-e69cd3894fff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_3c38213e-102f-4153-a2c6-6c4e53eff903" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5c0eda45-7d82-40f4-8024-db3a2397fecb" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_3c38213e-102f-4153-a2c6-6c4e53eff903" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_1e350276-7b79-4b43-a2bd-0138ac1eb9d1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5c0eda45-7d82-40f4-8024-db3a2397fecb" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_1e350276-7b79-4b43-a2bd-0138ac1eb9d1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_80f142c9-3f7b-488d-8b52-4c94a374849a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5c0eda45-7d82-40f4-8024-db3a2397fecb" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_80f142c9-3f7b-488d-8b52-4c94a374849a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_f40ad1ed-d113-4eeb-a825-09551cfdabe1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5c0eda45-7d82-40f4-8024-db3a2397fecb" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_f40ad1ed-d113-4eeb-a825-09551cfdabe1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_39ae9285-99f2-45e9-9561-d5bebe76d7e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_4277d92e-5062-4bbf-8663-85f0655a019f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_39ae9285-99f2-45e9-9561-d5bebe76d7e4" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_4277d92e-5062-4bbf-8663-85f0655a019f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_fb232e5a-a517-44c3-bddf-7c928672c6da" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_39ae9285-99f2-45e9-9561-d5bebe76d7e4" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_fb232e5a-a517-44c3-bddf-7c928672c6da" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/IntangibleAssetsNetSummaryofBalancesofIntangiblesAssetsandAccumulatedAmortizationDetails" xlink:type="simple" xlink:href="dsp-20250930.xsd#IntangibleAssetsNetSummaryofBalancesofIntangiblesAssetsandAccumulatedAmortizationDetails"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/IntangibleAssetsNetSummaryofBalancesofIntangiblesAssetsandAccumulatedAmortizationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1bbc8a83-f74e-4a14-a4a4-17c5bde3c494" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_d451af29-2139-488e-a82b-53db9105e45e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1bbc8a83-f74e-4a14-a4a4-17c5bde3c494" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_d451af29-2139-488e-a82b-53db9105e45e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bfb1b210-86c1-498e-85c8-3002ae7c3cbb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1bbc8a83-f74e-4a14-a4a4-17c5bde3c494" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bfb1b210-86c1-498e-85c8-3002ae7c3cbb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/IntangibleAssetsNetSummaryofEstimatedFutureAmortizationofIntangibleAssetsDetails" xlink:type="simple" xlink:href="dsp-20250930.xsd#IntangibleAssetsNetSummaryofEstimatedFutureAmortizationofIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/IntangibleAssetsNetSummaryofEstimatedFutureAmortizationofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bdaaea41-64ce-438c-803c-db18b4c28d60" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_c3a4ae28-663f-4995-9301-5becf5895248" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bdaaea41-64ce-438c-803c-db18b4c28d60" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_c3a4ae28-663f-4995-9301-5becf5895248" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_ab8635d0-7674-41cc-9948-3adef58908de" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bdaaea41-64ce-438c-803c-db18b4c28d60" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_ab8635d0-7674-41cc-9948-3adef58908de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_c9ece70a-1941-4f45-8f03-aa03ed75dc24" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bdaaea41-64ce-438c-803c-db18b4c28d60" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_c9ece70a-1941-4f45-8f03-aa03ed75dc24" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour_ee5f29c2-7428-473d-a4b7-af20f98df198" xlink:href="dsp-20250930.xsd#dsp_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bdaaea41-64ce-438c-803c-db18b4c28d60" xlink:to="loc_dsp_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour_ee5f29c2-7428-473d-a4b7-af20f98df198" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_08bdec3c-b529-45a2-aaa5-626d855ae7d2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bdaaea41-64ce-438c-803c-db18b4c28d60" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_08bdec3c-b529-45a2-aaa5-626d855ae7d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_b0f20999-ddee-4974-ad4e-02c631ddd6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bdaaea41-64ce-438c-803c-db18b4c28d60" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_b0f20999-ddee-4974-ad4e-02c631ddd6f5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/AccruedLiabilitiesSummaryofAccruedLiabilitiesDetails" xlink:type="simple" xlink:href="dsp-20250930.xsd#AccruedLiabilitiesSummaryofAccruedLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/AccruedLiabilitiesSummaryofAccruedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_04923f39-0ca6-41a0-950b-aa88a9f92547" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_AccruedTrafficAcquisitionCosts_d163cdd8-467a-48c0-be22-5ea140647802" xlink:href="dsp-20250930.xsd#dsp_AccruedTrafficAcquisitionCosts"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_04923f39-0ca6-41a0-950b-aa88a9f92547" xlink:to="loc_dsp_AccruedTrafficAcquisitionCosts_d163cdd8-467a-48c0-be22-5ea140647802" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_c58937b3-f914-4b2b-804a-406a3ae0827d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_04923f39-0ca6-41a0-950b-aa88a9f92547" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_c58937b3-f914-4b2b-804a-406a3ae0827d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/LossPerShareCalculationofBasicandDilutedNetLossPerShareDetails" xlink:type="simple" xlink:href="dsp-20250930.xsd#LossPerShareCalculationofBasicandDilutedNetLossPerShareDetails"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/LossPerShareCalculationofBasicandDilutedNetLossPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_ad8a2e1e-9f66-49a1-a6e3-3e3620b79085" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_6d81750a-4d1c-475a-94e5-b3a6de6eb31a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_ad8a2e1e-9f66-49a1-a6e3-3e3620b79085" xlink:to="loc_us-gaap_ProfitLoss_6d81750a-4d1c-475a-94e5-b3a6de6eb31a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6c9c9d8f-ba7d-4a16-941d-bf52b91fab4e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_ad8a2e1e-9f66-49a1-a6e3-3e3620b79085" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6c9c9d8f-ba7d-4a16-941d-bf52b91fab4e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToParentDiluted_5156ff14-69b0-424f-96a1-ca14f510e823" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAttributableToParentDiluted"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_467adf68-1be3-48b1-b37e-61eb1e57d44b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAttributableToParentDiluted_5156ff14-69b0-424f-96a1-ca14f510e823" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_467adf68-1be3-48b1-b37e-61eb1e57d44b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_DilutiveSecuritiesEffectOnBasicEarningsPerShareESOPConvertiblePreferredStockNet_0fafa4e7-7613-49e2-bfa9-57bd5b735486" xlink:href="dsp-20250930.xsd#dsp_DilutiveSecuritiesEffectOnBasicEarningsPerShareESOPConvertiblePreferredStockNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAttributableToParentDiluted_5156ff14-69b0-424f-96a1-ca14f510e823" xlink:to="loc_dsp_DilutiveSecuritiesEffectOnBasicEarningsPerShareESOPConvertiblePreferredStockNet_0fafa4e7-7613-49e2-bfa9-57bd5b735486" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_DilutiveSecuritiesEffectOnBasicEarningsPerShareESOPConvertiblePreferredStockIncomeTaxEffect_cddfa519-b0e0-4985-a611-b105c9e1c53f" xlink:href="dsp-20250930.xsd#dsp_DilutiveSecuritiesEffectOnBasicEarningsPerShareESOPConvertiblePreferredStockIncomeTaxEffect"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAttributableToParentDiluted_5156ff14-69b0-424f-96a1-ca14f510e823" xlink:to="loc_dsp_DilutiveSecuritiesEffectOnBasicEarningsPerShareESOPConvertiblePreferredStockIncomeTaxEffect_cddfa519-b0e0-4985-a611-b105c9e1c53f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.viantinc.com/role/NoncontrollingInterestsSummaryofEffectofChangesinOwnershipInterestinViantTechnologyLLConEquityDetails" xlink:type="simple" xlink:href="dsp-20250930.xsd#NoncontrollingInterestsSummaryofEffectofChangesinOwnershipInterestinViantTechnologyLLConEquityDetails"/>
  <link:calculationLink xlink:role="http://www.viantinc.com/role/NoncontrollingInterestsSummaryofEffectofChangesinOwnershipInterestinViantTechnologyLLConEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet_6bc85019-3428-453f-bb75-d37fa9533d59" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_dsp_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesOwnershipChanges_a94b4fe9-47b0-4f47-951b-79977545367b" xlink:href="dsp-20250930.xsd#dsp_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesOwnershipChanges"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet_6bc85019-3428-453f-bb75-d37fa9533d59" xlink:to="loc_dsp_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesOwnershipChanges_a94b4fe9-47b0-4f47-951b-79977545367b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_929ba22d-f92a-40c0-af4b-bfef9a660920" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet_6bc85019-3428-453f-bb75-d37fa9533d59" xlink:to="loc_us-gaap_NetIncomeLoss_929ba22d-f92a-40c0-af4b-bfef9a660920" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
