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CPA Calculator

By Thuong Le · Reviewed

Enter what you spent and how many conversions you got to see your CPA, or work back to the spend or the conversions.

What you paid for the ads.

Sales or sign-ups you count as a result. Whole numbers only.

CPA
$12.50

Compare scenariosSave up to three versions and compare them

Scenario A

Scenario B

Scenario C

How it works

CPA is the average cost of one conversion: the ad spend divided by the number of conversions. A conversion is whatever result you count, such as a sale or a sign-up. Decide what you count before you compare CPAs, because a lead and a purchase are not the same result.

CPA = spend ÷ conversions

spend = CPA × conversions

conversions = spend ÷ CPA

Worked example

You spend $500.00 and get 40 conversions.

  1. 1CPA$500.00 ÷ 40 = $12.50

What is a good CPA?

Benchmarks vary by industry and platform, so this page gives no number. A CPA is good or bad next to what a conversion earns you, so compare it with your profit per sale.

Questions

What counts as a conversion?

Whatever you track as the goal: a purchase, a lead, an app install. The calculator only divides, so use the same definition every time you compare.

Is CPA the same as customer acquisition cost?

Not necessarily. Customer acquisition cost often includes more than ad spend, depending on how a company defines it. This calculator uses ad spend only.

How many conversions will a budget buy?

Choose "Conversions from spend and CPA". $1,000 at a $30 CPA is exactly 33.33 conversions, which shows as ≈ 33.

How do I know if my CPA is too high?

Compare it with the profit on one conversion. If a sale brings $30 of profit and the CPA is $40, each sale loses $10 once the ad cost is counted. The margin calculator helps you find the profit per sale.

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