CPA Calculator

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

In short

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

Formula: CPA = cost ÷ actions.

Complete the required fields to see the result.

What this calculator does

CPA: CPA = cost ÷ actions. Methodology stated, your own inputs only. Worked example, questions and limitations included.

Use it to turn Currency (symbol only, never converted), Campaign cost, Conversions or actions into a checked result you can compare, copy, or rerun with different assumptions.

The page shows the formula, a numeric worked example, and the assumptions that affect this marketing calculation.

Inputs and what they mean

Currency (symbol only, never converted): — choice value.
Campaign cost: — number value.
Conversions or actions: — number value.

How to use it

Enter each value in the unit shown next to the box (use the unit converter first if your numbers are in other units).
Check the breakdown to see every intermediate step.
Read the limitations before relying on the result.

Formula

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.

Worked example

Lead generation

3,000 ÷ 120 = $25.

Reading the result

The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.

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.

Reference: IAB

Last reviewed: October 15, 2026

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.

Sources

Method based on IAB.

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