CPA Calculator

How to use the CPA Calculator

Estimate advertising cost per recorded acquisition or conversion. Enter spend and the count of the specific action you want to measure.

Formula

CPA = advertising spend ÷ acquisitions.

Worked example

$600 spend and 30 acquisitions give $20 CPA.

Interpretation and limitations

Acquisitions must be positive. Define the action consistently: a lead, signup and paid customer are not interchangeable. This tool includes only the spend you enter, not automatically the full sales budget.

CPA questions

Is CPA the same as CAC?

Not always. CAC commonly includes marketing and sales costs for new customers; CPA may measure an earlier action such as a lead.

What happens with no acquisitions?

There is no finite CPA because the denominator is zero. Review spend and conversion tracking instead of reporting zero cost.

Continue your calculation

For the next step, use the Customer Acquisition Cost Calculator or the ROAS Calculator. Review each tool’s input definitions before carrying a result into another calculation.

Frequently asked questions

Is this calculator free?

Yes. It runs in your browser and does not require an account.

How should I use the result?

Use the result as a planning estimate and verify business-critical decisions against your source records.