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Free CPA Calculator

See exactly what it costs to win a customer, and whether they're worth more than you paid.

  • Free to use
  • No login
  • Result on screen first
Your answer shows hereAdd what you spent and how many customers it won, and the cost of each customer appears here.

Why it matters

The number that decides if ads work

CPA is the honest test. If it costs £50 to win a customer who spends £40, you're paying to lose money, and no amount of scaling fixes that, it just loses faster.

Compare your CPA to what a customer is actually worth, and watch it per channel, some quietly cost double the rest. Neuron Monitor tracks it live.

What it works out

  • Cost of each customerTotal spend divided by the customers it won.
  • Is a customer worth it?Add your average order value to compare what they spend with what they cost.
  • What is left per customerOrder value minus cost, before your product costs.
  • A plain verdictWhether it is safe to spend more, or time to fix the numbers first.

What to do next

Know the cost of a customer? Now make it smaller.

Your result is yours to keep, with no email needed. These are the best next steps.

  • Check your return

    See whether the money you spend is coming back at your margin.

    ROAS calculator

  • Win more from the same visitors

    A page that converts better lowers what each customer costs.

    Conversion rate

  • Track it per channel

    Neuron Monitor shows which channels win customers cheapest.

    Open Monitor

Good to know

Questions, answered plainly.

  • What is CPA?

    Cost Per Acquisition: total spend divided by customers won. Spend £2,000 to get 40 customers and your CPA is £50.

  • Is my CPA too high?

    It's too high the moment it's more than a customer is worth to you. Add your average order value above and we'll show your margin per customer.

  • CPA vs CAC?

    People use them loosely. CPA usually means cost per conversion from a channel; CAC often includes all sales and marketing costs. This tool does the per-channel version.

  • Is it free?

    Yes, no login. Neuron Monitor tracks real CPA per channel automatically.

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Useful next door.

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Where this goes

Track cost-per-customer automatically

Neuron360 shows real CPA per channel, so you double down on the cheap ones and cut the rest.

Open MonitorGet my free plan

Want to hear when the full suite opens?

Your result above is yours already. This is an optional swap: leave your email and we will tell you the day Neuron360 opens.

  • One confirmation now, and one email when the suite opens.
  • Used only to tell you about Neuron360.
  • No email? No problem. The tool works the same without it.