CPA basics
CPA (cost per acquisition/action) is the cost per conversion (purchase/lead/signup—define it).
From CPM to CPA
- Compute CPC from CPM and CTR:
CPC = CPM ÷ (1000 × CTR) - Compute CPA from CPC and CVR:
CPA = CPC ÷ CVR
Break-even CPA
Break-even CPA is the maximum you can pay on the first order without losing money. It depends on AOV, margin, fees and refunds.
Tools: CPA Calculator and Break-even CPA.