Glossary/Measurement & Attribution/Cost Per Incremental Acquisition (CPIA)
Measurement & Attribution
Cost Per Incremental Acquisition (CPIA)
Ad spend divided by the number of conversions proven to be caused by the campaign, rather than all attributed conversions.
By Brandon Mina·CEO, BrandPilot AI·Updated November 2026
Short answer
Cost per incremental acquisition (CPIA) is ad spend divided by the number of conversions proven to have been caused by a campaign, rather than all conversions attributed to it. Incremental conversions are usually estimated through lift tests with control groups. CPIA reveals the true cost of new results and is typically higher than standard CPA.