When to use this calculator
Campaign CPA is narrower than a fully loaded customer acquisition cost, which can include sales teams and other expenses.
Explore the marketing & customer calculators for other questions in this topic. For a related calculation, use the Cost Per Click Calculator: Calculate average advertising spend per click.
PUTTING IT INTO PRACTICE
Cost Per Acquisition: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Campaign cost | 600 |
| Acquisitions (integer) | 20 |
| Result | 30 per acquisition |
- Check the input labels and enter the example values above.
- Apply the relationship: CPA = campaign cost/acquisitions.
- The result is 30 per acquisition, rounded for display.
How to interpret your result
Use a consistent conversion definition and attribution window. This may exclude non-advertising acquisition costs.
Define the event, audience and attribution window before calculating a rate. Clicks, customers and orders are different units. Acquisition cost and campaign CPA may cover different spending categories.
Frequently asked questions
Should I count unique users or total events?
Use the definition matching your metric. State it consistently because repeat events can produce a different rate from unique people.
When is the cost per acquisition calculator useful?
Campaign CPA is narrower than a fully loaded customer acquisition cost, which can include sales teams and other expenses.
How do I use the cost per acquisition calculator?
Enter campaign cost, acquisitions (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
CPA = campaign cost/acquisitions.
What should I check before using the result?
Use a consistent conversion definition and attribution window. This may exclude non-advertising acquisition costs.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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