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CPA Calculator

Enter your ad spend and conversions to get your cost per acquisition — the number that decides whether your Google Ads actually pay.

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Cost per acquisition

How to calculate CPA

CPA = Ad spend ÷ Conversions. £1,000 for 40 conversions is a £25 CPA. Compare it to what a customer is worth (see the Lead Value and LTV tools).

CPA only means something next to value

A £25 CPA is superb if a customer is worth £300 and terrible if they’re worth £20. Always judge CPA against customer value, not in isolation.

Frequently asked questions

How do I calculate CPA?

Divide total ad spend by the number of conversions (acquisitions).

What is a good CPA?

One comfortably below the profit a customer generates. Use the Lead Value / LTV tools to set your ceiling.

Is this free?

Yes — no sign-up.

Numbers not adding up?

If the figures aren't where you want them, tell me what you're seeing. I'll give you a straight answer on whether it's fixable and whether I'm the right person to fix it.

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