CPA Calculator
Work out cost per acquisition from ad spend and conversions, and compare it with the break-even CPA your revenue and margin allow.
- Free
- No sign-up to try
- Works as you type
Cost per acquisition
Cost per acquisition (CPA)
$50.00
Break-even CPA
$54.00
Profit per conversion after ads
$4.00
Conversions needed to cover this spend
149
- CPA = ad spend ÷ conversions.
- Break-even CPA = revenue per conversion × gross margin.
- Profit per conversion = break-even CPA − CPA.
- Conversions to cover spend = spend ÷ break-even CPA, rounded up.
Free, no sign-up to try. Save it as a live calculator you can share; an estimate from the numbers you enter, not financial advice. Check the result against your own records before you rely on it.
How it works
How the CPA Calculator works
- 1
Enter your numbers
Every result updates as you type, with the formula shown under it.
- 2
Check the method
See how each number is worked out and what it assumes.
- 3
Save it as a Room
Share a live calculator: others can change the numbers and see the result update.
Worked example
What it makes
Example inputs
- Ad spend
- $8,000
- Conversions from that spend
- 160
- Revenue per conversion
- $120
- Gross margin on that revenue
- 45 %
Results
- Cost per acquisition (CPA)
- $50.00
- Break-even CPA
- $54.00
- Profit per conversion after ads
- $4.00
- Conversions needed to cover this spend
- 149
How it's calculated
- CPA = ad spend ÷ conversions.
- Break-even CPA = revenue per conversion × gross margin.
- Profit per conversion = break-even CPA − CPA.
- Conversions to cover spend = spend ÷ break-even CPA, rounded up.
- Assumes: Revenue is from the first purchase only: repeat purchases would raise the CPA you can afford.
- Assumes: Conversions are the ones your attribution credits to this spend.
An estimate from the numbers you enter, not financial advice. Check the result against your own records before you rely on it.
Who it's for
Who uses it
Performance marketers
Set a CPA target that stays profitable.
Agencies
Show a client where their CPA sits against break-even.
Store owners
Check whether a campaign makes money on the first order.
Good to know
What to consider
- This counts the first purchase only; repeat orders let you pay a higher CPA.
- Conversions are the ones your attribution credits to this spend.
Questions
About the CPA Calculator
What is a break-even CPA?
The most you can pay for a conversion before it loses money: revenue per conversion × gross margin. Below it, each conversion makes a profit after ads; above it, each one costs you.
Can I share the calculator with my team or a client?
Yes. The Room keeps the calculator live: anyone with the link can change the numbers and see the result update, with the method and assumptions on the same page.
Make your calculator now
Free, no sign-up to try. It becomes a Room you can edit, publish and share.
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Related tools
- CAC CalculatorWork out your customer acquisition cost two ways: blended CAC across all sales and marketing spend, and paid CAC from ad spend alone.
- Break-Even ROAS CalculatorFind the return on ad spend where ads stop losing money, from your order value and costs, plus the ROAS that leaves the profit you want.
- CPC CalculatorWork out cost per click from spend and clicks, then how many clicks and conversions a budget buys and what each conversion costs.