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Cost per Acquisition Calculator.

Calculate campaign cost per acquisition from spend and attributed conversions.

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Cost per acquisition: $25.00

Cost per acquisition

$0.00

Results are estimates from the stated formula and inputs; verify assumptions before making financial decisions.

FAQs

How is Cost per Acquisition calculated?

Attribution windows and conversion quality are not inferred.

Use Cases

Budget Planning and Optimization

Plan your marketing budget by estimating the CPA you can afford. Adjust your spend or conversion targets to achieve a desired CPA, helping you allocate resources more efficiently across channels.

Example: If you want a CPA of $30 and expect 50 conversions, you can budget up to $1,500.

Frequently Asked Questions

What is CPA and how is it calculated?
CPA, or cost per acquisition, is a marketing metric that shows the average cost to acquire one customer or conversion. It's calculated by dividing the total campaign spend by the number of conversions. For example, if you spend $500 and get 10 conversions, your CPA is $50.
Why is CPA important for my business?
CPA helps you evaluate the efficiency and profitability of your marketing campaigns. By knowing your CPA, you can compare it to the average revenue per customer to ensure you're not overspending. It also helps you allocate budget to the most effective channels and optimize your marketing strategy.
What is a good CPA?
A good CPA depends on your industry, profit margins, and business model. Generally, a CPA that is lower than the customer lifetime value (LTV) is considered good. To determine if your CPA is healthy, compare it to your average profit per customer and your target return on ad spend (ROAS).

Tips & Common Mistakes

Tips

  • Ensure you track conversions accurately using analytics tools to get reliable CPA numbers.
  • Regularly calculate CPA for each campaign or channel to identify which ones are most cost-effective.
  • Compare your CPA to your average order value or customer lifetime value to ensure profitability.
  • Use CPA alongside other metrics like ROAS and conversion rate for a complete performance picture.

Common Mistakes to Avoid

  • Including all spend but not all conversions, or vice versa, leading to an inaccurate CPA.
  • Comparing CPA across different industries or business models without considering context.
  • Ignoring the time period of the campaign; CPA can vary over time, so use consistent time frames.

Last updated: August 13, 2026