CPA calculator

Calculate cost per conversion, or work backward from CPA to estimate a budget or delivery volume.

Use totals for the same period and one currency. Choose the value you need, then enter the two known values.

Calculate

Spend / budget Use the same cost basis, including or excluding fees consistently.

Conversions Fractional attributed conversions are accepted.

CPA Rate in the same currency as spend.

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The formula

CPA = spend ÷ conversions

Spend = CPA × conversions

Estimated conversions = spend ÷ CPA

Worked example · sample data

500 in spend and 10 conversions gives a CPA of 50.00.

Name the action before comparing CPA: a lead and a purchase are different outcomes. Use the same attribution window.

To combine campaigns, add their spend and volume first. Do not average their individual cost rates.

Reverse calculations are planning estimates, not promised conversions.