Quick answer
How do you calculate Cost Per Acquisition?
Use CPA = Advertising cost ÷ Acquisitions. Enter the matching values above to calculate the result instantly.
What it measures
Understanding Cost Per Acquisition
Calculate average advertising cost for each acquisition or conversion. Define acquisition before calculating: a lead, trial, first purchase, and retained customer have very different economic value.
Interpretation
What the result means
The result is the average media cost attributed to each counted acquisition.
Action
How to use it
Set an allowable CPA from contribution profit or lifetime value, then compare channels using the same attribution window.
Limits
What it leaves out
Basic CPA may exclude creative, agency, sales, and technology costs and can be biased by attribution rules.
The math
Cost Per Acquisition formula
Worked example
Example calculation
- Calculation
- $12,000 ÷ 240
- Result
- $50 CPA
Step by step
How to use this calculator
- 1Enter advertising cost, acquisitions.
- 2Keep every input on the same time period and measurement basis.
- 3Review the result, then change one assumption at a time to test scenarios.
Decision support
When this calculator is useful
- Campaign budgeting
- Channel comparison
- Bid target setting
Common questions
Frequently asked questions
Which inputs should I use for Cost Per Acquisition?
Use advertising cost, acquisitions, measured from the same source and period. Include only values that match the definitions shown beside each field.
Why might two Cost Per Acquisition calculations differ?
The systems or accounting policies may define advertising cost, acquisitions differently. Compare the time period, scope, source, and treatment of exceptional items before comparing results.
How often should I recalculate Cost Per Acquisition?
Recalculate when any input changes materially and on the same reporting cadence used for the decision. Save the source and date of each input so the trend remains comparable.
Can I use Cost Per Acquisition by itself?
No single metric captures the full decision. Use the result with the related measures, assumptions, and limitations shown on this page.
Calculation reviewed: 2026-06-18. CalcPilot uses the formula shown above and tests representative values during the production build. See our methodology and correction policy.
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