Cost per Acquisition (CPA)
Cost per acquisition (CPA) is the average amount spent on advertising to win one conversion, such as a lead or a sale: costs divided by conversions.
What is cost per acquisition?
Cost per acquisition (CPA) is the average advertising cost of one conversion – a lead, a sign-up or a sale. It is calculated as total costs divided by the number of conversions: EUR 2,000 in ad spend and 40 leads mean a CPA of EUR 50. In lead generation, the same figure is often called cost per lead (CPL).
CPA is one of the most important metrics in performance marketing because it connects spend directly to business results. Unlike the cost per click, it also reflects the conversion rate of your landing pages.
In Google Ads and Microsoft Advertising, target CPA is a Smart Bidding strategy: you set the average cost you are willing to pay per conversion, and the system adjusts bids to reach it. It works best with reliable conversion tracking and enough conversion volume.
Things to keep in mind:
- Not every conversion is worth the same. A CPA of EUR 50 is cheap for a qualified enterprise lead and expensive for a newsletter sign-up. If values differ, optimize for ROAS or import qualified leads (offline conversion import).
- Set targets per market. Costs, conversion rates and deal values differ by country, so one global target CPA rarely works.
- Check what counts. Spam leads or minor actions counted as conversions make the CPA look better than it is.