CPA Calculator
Acquisition cost against contribution per order.
Cost per acquisition
$22.22
ceiling is $24.36
Each order costs $22.22 to win and contributes $24.36, leaving $2.14. The ceiling is the contribution itself — above that, volume makes the problem bigger.
How the CPA Calculator works
The ceiling on cost per acquisition is contribution per order, exactly. Pay more than that and the order loses money — and unlike most problems in advertising, volume makes this one bigger rather than smaller.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price — check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
How do I calculate CPA?
Spend divided by conversions. The useful version compares it against contribution per order, which is average order value times contribution margin.
What is a good CPA?
Below contribution per order if you need first-order payback, or below lifetime contribution if you can fund the gap until repeat purchase closes it.
Should I use target CPA bidding?
Once there is enough conversion volume for the algorithm to learn — typically thirty a month per campaign. Below that it optimises on noise.
How do I reduce CPA?
Conversion rate first, since CPA is CPC divided by conversion rate. A 20% improvement in conversion cuts CPA by a sixth and requires no bid changes at all.