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CPA calculator

Enter ad spend and conversions to get your cost per acquisition and check it against your margin.

Inputs

Results update live as you type.

Cost per acquisition
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Enter values to calculate.

Total spend
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Conversions
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Formulas: CPA = ad spend / conversions. Profitable when below the gross profit each customer brings.
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CPA vs CAC

CPA usually means the cost of one conversion from a specific campaign, while CAC (customer acquisition cost) covers all marketing and sales spend per new customer. CPA is the campaign metric; CAC is the business metric.

What CPA can you afford

Your break-even CPA equals the gross profit per new customer. If each customer brings $60 of margin, any CPA under $60 keeps acquisition profitable. For repeat buyers, compare CPA against lifetime value instead.

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CPA Calculator FAQs

How do you calculate CPA?
Divide total ad spend by the number of conversions. $1,000 spend producing 40 conversions is a $25 CPA.
What is a good CPA?
One below your profit per acquisition. Benchmarks vary wildly by industry, so your own margin is the only target that matters.
How can I lower my CPA?
Improve conversion rate (landing page, offer), raise click quality (targeting, keywords), or lower CPC (better Quality Score, broader efficient reach).
CPA vs CPC, what is the difference?
CPC is the cost of one click; CPA is the cost of one completed conversion. CPA = CPC / conversion rate, so both cheaper clicks and better conversion lower it.
Is my data uploaded anywhere?
No. Every calculation happens in your browser with JavaScript. Nothing you enter leaves your device.
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