# CPA Calculator

> CPA: CPA = cost ÷ actions. Methodology stated, your own inputs only.

Page: https://freecalculator.tech/tools/cpa-calculator
Last reviewed: 2026-10-15

## Formula

CPA = cost ÷ actions.

- Methodology: IAB definition — cost per defined action (sale, lead, sign-up).
- You define the action; it must match the conversion counted by your platform.
- CPA is a campaign metric; CAC counts only new customers and can include sales cost.
- CPA = cost ÷ actions.
- Inputs used: Currency (symbol only, never converted), Campaign cost, Conversions or actions.

## Inputs

- Currency (symbol only, never converted)
- Campaign cost
- Conversions or actions

## Worked example: Lead generation

$3,000 for 120 leads.
1. 3,000 ÷ 120 = $25.

## Common questions

### CPA vs CAC?

CPA is per action of any kind; CAC is per new paying customer across all acquisition spend. Check the formula, example, and limitations on this page before using the result for a real marketing decision.

### Which attribution?

Whatever your platform reports; different attribution windows change CPA. Check the formula, example, and limitations on this page before using the result for a real marketing decision.

### What is a good value?

It depends on channel, audience and industry. We don't assume a benchmark — compare against your own campaigns.

### How do I use the CPA Calculator?

Enter the required values for Currency (symbol only, never converted), Campaign cost, Conversions or actions. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the CPA Calculator use?

CPA = cost ÷ actions. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.

### Can the CPA Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Depends on attribution.
- Action definition is yours.
- Results are educational estimates built only from the figures you enter. They are not personalised investment, tax, legal or accounting advice. Rates, growth and discount assumptions are always yours to choose.
- The result depends on the values you enter for this cpa calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- IAB — https://www.iab.com/insights/glossary-of-terminology/

## Cite this page

- APA: Free Calculator. (2026, October 15). CPA Calculator. https://freecalculator.tech/tools/cpa-calculator
- MLA: "CPA Calculator." Free Calculator, 15 Oct. 2026, https://freecalculator.tech/tools/cpa-calculator.
- Link: CPA Calculator — Free Calculator, https://freecalculator.tech/tools/cpa-calculator