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CPA Calculator

Cost Per Acquisition shows how much ad spend it took, on average, to generate a single conversion from a specific campaign or channel.

$

Cost Per Acquisition

$50.00

What This Means

What each conversion cost from this campaign. Compare against Break-Even ROAS and CAC to know if that's actually affordable.

Want the full picture, not just this one number?

Try the Ad Performance Calculator

The Formula

CPA = Ad Spend / Number of Conversions

Why It Matters

CPA is the most direct link between a campaign and the acquisition cost that feeds into CAC and Breakeven CAC, so it's usually the first number media buyers optimize toward once a campaign is live. Watching it alongside conversion rate helps separate a targeting problem from a landing page problem.

Example

A campaign spends $4,000 and drives 80 conversions. CPA is $4,000 divided by 80, which equals $50.

Frequently Asked Questions

  • They're related but not identical. CPA is usually campaign- or channel-level and counts a specific conversion action. CAC is typically the fully blended acquisition cost across all sales and marketing spend company-wide.

  • Improving conversion rate on the destination page, tightening targeting to a more qualified audience, and improving ad relevance to lower CPC are the three most common levers.

Related Calculators

CPC CalculatorROAS Calculator

From the Glossary

Cost Per Acquisition (CPA)Return on Ad Spend (ROAS)
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