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CPA Calculator

Work out cost per acquisition from spend and conversions.

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Use the cpa calculator

Work out cost per acquisition from spend and conversions.

Ad spend (£)

Total campaign spend

Conversions

Number of acquisitions or sales

Revenue (£, optional)

Optional revenue for context

Enter your values to see the result.

Quick Guide

Quick answer

CPA Calculator: CPA Calculator helps turn marketing performance inputs into a clear result you can compare, explain, and use for a practical decision.

Formula / core ruleCPA = ad spend ÷ conversions

This section explains the rule behind the result in plain language.

ExampleIf £300 in ad spend creates 12 conversions, CPA is £25.

Use this example as a quick check on how the inputs affect the answer.

Common mistakeIgnoring the value or margin of each conversion.

Checking this point helps prevent a misleading result.

How to interpret the result

CPA shows the average acquisition cost for one conversion.

Methodology

The CPA Calculator uses the values you enter to calculate the result shown in the panel. The supporting notes explain the method, the assumptions to check, and the situations where the answer should be treated as guidance rather than a final decision.

Reviewed by CalcBeacon Editorial TeamUpdated May 2026Category: Marketing MetricsTransparent formula and example

How it works

CPA Calculator formula

CPA = ad spend ÷ conversions

What this helps with

Use this tool for a quick planning calculation before checking a full spreadsheet, payslip, quote or official document.

Worked example

If you spend £500 and get 25 conversions, your CPA is £20.

Best use

Compare scenarios quickly by changing one or two inputs at a time.

Practical Guide

Understanding the result

This calculator helps estimate values quickly using the information you provide. It can be useful for comparisons, planning, and faster decision-making.

What the result means

The result should be interpreted together with your specific goals, assumptions, and real-world conditions.

Typical considerations

Small input changes can affect the final result
Use realistic assumptions whenever possible
Compare multiple scenarios for better insight

Example

Enter realistic values, calculate the result, then test another scenario with adjusted assumptions.

Common mistakes

Using unrealistic inputs
Ignoring related costs or factors
Relying on estimates without verification

Frequently asked questions

What counts as an acquisition?

Use the action that matters most to you, such as a sale, lead or booked call.

Can CPA be compared to AOV?

Yes. It is a useful way to judge whether acquisition cost is sustainable.

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