Free tool · Advertising metrics
CPA calculator
Cost per acquisition (CPA) is what you actually pay for each conversion. Enter your spend and conversions to measure it — and check it against the target your margins allow.
Total spend for the period you’re measuring.
Count the same thing for spend and target — leads, purchases, signups.
The most you can afford to pay per conversion.
Enter your spend and conversions to see your CPA.
Estimate only. CPA moves with attribution windows and conversion definitions — a “conversion” in ads manager isn’t always a paying customer. Compare like with like.
What this means
CPA is the metric closest to what matters: not what you paid for (impressions, clicks) but what you got. The right target comes from your unit economics — what a customer is worth and the return you need on acquiring them — not from what competitors bid.
A CPA over target has three usual fixes: cheaper traffic, a better conversion rate, or fewer low-intent campaigns soaking up budget. Adsevon's analysis distinguishes between them using your actual campaign data, then prioritizes the fixes with evidence attached.
Questions about this tool
What is CPA in advertising?
CPA (cost per acquisition) is the average ad spend required to produce one conversion — a purchase, signup, or lead. It is calculated as ad spend ÷ conversions.
How do I set a target CPA?
Work backwards from what a customer is worth. If a customer is worth $120 in gross profit over their lifetime and you want a 3:1 return on acquisition, your target CPA is $40. Set the target from unit economics, not from what competitors bid.
Why is my CPA rising?
Common causes: audience fatigue (the same people see the ad too often), increased auction competition, a broken landing page, or scale — spending more usually buys progressively more expensive conversions.
CPA vs CPC vs CPM — what’s the difference?
CPM is cost per 1,000 impressions, CPC is cost per click, and CPA is cost per conversion. CPM and CPC describe what you pay for; CPA describes what you get. Optimize for the one closest to revenue.
One number isn't the whole picture
A calculator tells you where you stand. Adsevon — an advertising intelligence and optimization platform — watches your campaigns continuously, finds the spend that isn't pulling its weight, and prioritizes what to fix next, with the evidence attached.