Glossary
Cost per acquisition (CPA)
What you pay in ad spend for each conversion, most often each purchase.
Also called CPA, cost per purchase, cost per conversion
Formula
CPA = amount spent ÷ conversions
Example
$900 spent for 30 purchases is a CPA of $30.
The most useful single number for sales campaigns: compare it with how much a customer is worth to you. A CPA below your average profit per order (or your break-even CPA) makes money.
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