What is CPA in marketing?
In marketing, CPA is cost per acquisition: total ad spend divided by conversions. Spend $12,000, close 200 customers, CPA is $60. Some platforms read the A as action, counting any tracked event, so confirm the definition before comparing numbers across reports.
Position
The last gate of the funnel
Four gates, four prices. CPM buys impressions, CPC buys clicks, CPL buys leads, CPA buys the acquisition itself. Each downstream metric is the upstream one divided by a conversion rate: CPA = CPC ÷ conversion rate. At the survey average CPC of $5.42LocaliQ · 2026 survey and average conversion rate of 8.18%LocaliQ · 2026 survey, the implied cost per conversion is $5.42 ÷ 0.0818 = $66.26, within rounding of the survey's directly measured $66.69 average cost per lead.
ImpressionClickConversionAcquisitionAcquisition vs action
The A is doing quiet work
Google's glossary defines cost per action as conversion cost divided by conversions, with you choosing which actions countGoogle Help · checked 2026. If your conversion event is a purchase, action and acquisition coincide. If it is a form fill, an install or an add-to-cart, your reported CPA prices an action that may never become a customer. The gap is the subject of cost per action vs cost per acquisition, and it is the first thing to check when an agency report looks too good.
Judge it
Three numbers that give CPA meaning
- Your vertical median: the industry table anchors whether you are paying market rate.
- Your break-even ceiling: AOV × margin × repeat sets the most a customer can cost before the math fails.
- Your blended read: blended CPA across channels, because platform self-attribution flatters each channel individually.
Run your own numbers on the calculator, then the metric compares: vs CPC, vs CPL, vs CAC. The affiliate sense lives at CPA marketing.