What is CPA?
CPA (cost per action) is the ad spend it took to get one desired action, such as a purchase, booking or consultation request.
Cost Per Action · Marketing Glossary · Updated
Industries where revenue doesn't link directly to ads, such as clinics, professional services and education, often judge ads by CPA rather than ROAS.
You can only compare CPA once you decide which action counts as a conversion (a call, a consultation request, a completed booking).
Formula
CPA = ad spend ÷ conversions
Sample If KRW 1 million in ad spend brought 20 consultation requests, CPA is KRW 50,000.
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