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Cost per Action (CPA) Calculator — result sheet
Calculate advertising cost per action and compare it with contribution per conversion and campaign results.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: CPA = marketing spend ÷ conversions; contribution per conversion = revenue per conversion − variable cost per conversion.
CPA tells a marketer how much of the entered spend produced each counted action. The additional contribution view helps separate an acquisition metric from a simple break-even scenario without assuming an attribution platform, currency, or tax regime.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Marketing spend — currency; minimum 0; maximum 1000000000000000000
- Completed actions or conversions — actions; minimum 1.0E-6; maximum 1000000000000000
- Revenue per conversion — currency/action; minimum 0; maximum 1000000000000000
- Variable cost per conversion — currency/action; minimum 0; maximum 1000000000000000
Worked example
| Input | Value |
|---|---|
| Marketing spend | 5000 |
| Completed actions or conversions | 100 |
| Revenue per conversion | 120 |
| Variable cost per conversion | 45 |
CPA = 50 per action, contribution before CPA = 75 per action, and net campaign contribution = 2,500.
Assumptions and limits
- Conversions are counted under the visitor's defined campaign window and attribution rule.
- Revenue and variable cost per conversion use the same currency and represent the same conversion population.
- The break-even comparison uses only the entered revenue, variable cost, and marketing spend.
- Refunds, overhead, sales costs, lifetime value, attribution windows, and platform-specific billing are not inferred.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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