CPA Calculator
CPA – cost per acquisition – is what you pay to win one customer or lead. This CPA calculator turns spend and conversations into a single number that decides which campaign you scale, which you fix, and which you switch off today.
How to calculate cost per acquisition
Total spend – everything you paid the platform over the period you’re measuring – one campaign, one ad group, or the whole account. Use the same window for both inputs. Management fees and creative cost sit outside this number unless you deliberately choose to include them.
Conversions – the completed actions you count as an acquisition: a purchase, a qualified lead, a booked call, a form fill. Define the action once and keep it consistent, because counting every form fill and every sale in the same bucket makes CPA meaningless.
For example: Say a Google Ads campaign spent $4,000 last month and produced 60 conversions. CPA = $4,000/60= $66.67 per acquisition. That sits almost exactly on the $66.69 median cost per lead Word Stream reported across 13,474 US search campaigns in 2026. Spend $4,000 for 120 conversions instead and CPA halves to $33.33
Frequently asked questions
What’s the difference between CPA and CPL? +
What’s a good CPA? +
Is $130 per lead too expensive? +
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Does CPA include agency fees? +
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