Free · Business planning calculators 💼

Advertising Cost per Action Calculator

Connect campaign spend, clicks, cost per click and completed actions.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

Cost per action divides ad spend by completed actions. An action might be a lead, booking or purchase; compare campaigns using the same action and attribution window.

CPA = ad spend ÷ actions; ad spend = clicks × cost per click

Worked example

Enter these known values and leave the other values blank.

Total ad spend
1000 USD
Number of clicks
500
Total attributed conversions
20
Average cost per click (CPC)
2 USD
Cost per acquisition (CPA)
50 USD

Assumptions and limitations

  • Inputs describe one consistent reporting period. Review the formula and counting conventions before comparing results.

Common questions

Is cost per action the same as acquisition cost?

Only if the action is a newly acquired customer and the costs counted are comparable. A form submission or repeat purchase represents a different outcome.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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