CPA Calculator
Calculate cost per acquisition from advertising spend and number of acquired customers or conversions.
Enter your values and press Calculate.
Tip: country presets are starting points only. Replace rates and prices with your actual figures whenever possible.
How this calculator works
Cost per acquisition equals campaign spend divided by the number of acquisitions. The optional order value input provides a simple revenue comparison.
Formula
$3,000 of advertising that generates 120 customers produces a $25 CPA.
Getting a more accurate result
- Define acquisition consistently: customer, sale, lead or signup.
- Use the same attribution window for spend and conversions.
- Compare CPA with contribution margin or customer lifetime value, not just revenue.
Understanding your result
The result is intended for comparison and planning. Real-world costs can differ because of local taxes, fees, tariffs, financing, usage patterns, equipment efficiency, rounding and other conditions. For important decisions, verify the inputs against your bill, contract, lender, employer or other authoritative source.
Frequently asked questions
What is a good CPA?
It depends on your margins, repeat purchase rate and customer lifetime value.
Can CPA be used for leads?
Yes, but it is often called cost per lead when the conversion is a lead rather than a customer.
Why can platform CPA differ from accounting CPA?
Different attribution rules and conversion windows can produce different counts.
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Updated for CostMeter V1.2 • September 2026