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CPA calculator (cost per acquisition)

CPA is what you pay in ads for one purchase, lead or sign-up. Enter spend and conversions; add revenue to see ROAS from the same numbers.

Free, no sign-up. Updated

Cost per acquisition

$25.00

ROAS
1.96x
Average order value
$49.00

How it's calculated

CPA
= spend ÷ conversions
Break-even CPA
= price − product cost − shipping − fees

Example

$1,800 of ads brought 72 orders, so CPA = 1,800 ÷ 72 = $25. If each order leaves $31 after product, shipping and fees, every order still earns $6 after ads.

CPA vs break-even CPA

Your CPA only means something next to what an order leaves you before ads. That amount is your break-even CPA: pay less per order and you profit, pay more and you lose on every sale. Get it from the break-even ROAS calculator.

FAQ

How do I calculate CPA?

Divide ad spend by the number of conversions. $1,800 ÷ 72 orders = $25.

What's a good CPA?

Any CPA below your profit per order before ads (your break-even CPA). For repeat-purchase products you may accept a higher first-order CPA if customers come back.

Is CPA the same as CAC?

Close. CPA usually counts one campaign's conversions; customer acquisition cost (CAC) spreads all acquisition spend over new customers only.

Should I use platform-reported conversions?

Use them to compare ads, but check totals against your store's real orders, since platforms can count the same sale differently.

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More free calculators

Break-even ROAS calculator

Enter what an order sells for and what it costs you: product, shipping and payment fees. You get the profit per order before ads, the most you can pay per purchase (break-even CPA) and the ROAS your ads must beat.

ROAS calculator

ROAS is the revenue your ads brought for each dollar spent. Enter ad spend and the revenue from those ads; add purchases to see cost per purchase and average order value.

Customer lifetime value calculator

Enter your average order value, how many times a customer buys in a year, for how many years, and your gross margin. You get lifetime revenue and gross profit per customer; add your acquisition cost to see the LTV:CAC ratio.

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Enter your cost and the markup you want to add to get the selling price, or enter cost and price to see your markup. The matching profit margin is shown next to it, since the two are easy to mix up.

Gross margin calculator

Enter your revenue and your cost of goods sold (COGS) for the same period, for one product or a whole month. You get gross profit and gross margin, the share of each sale left after the goods themselves are paid for.