Tool · Free
CPA Calculator
CPA = ad spend ÷ conversions
What is CPA?
Divide spend by conversions and you have CPA: the price of one purchase, lead, signup, or whatever else the campaign counts as a conversion.
This is the number that decides whether a campaign scales. As long as a conversion is worth more than it costs, you can keep buying them.
Worked example
You spent $3,000 and got 60 signups. 3,000 ÷ 60 = $50 CPA.
Questions
What is the difference between CPA and CAC?+
CPA prices one conversion from one campaign, and the conversion can be anything — a lead, a trial, a demo. CAC prices one new paying customer across all sales and marketing spend. A $50 CPA per lead can sit inside a $2,000 CAC.
What is a good CPA?+
Anything comfortably below what the conversion is worth. For e-commerce that is the order margin; for leads it is lead value — deal size × close rate. If a customer is worth $400 in margin, a $50 CPA is excellent and a $500 CPA is a loss.
Why do the ads platform and my analytics report different CPAs?+
Different attribution. The platform claims a conversion when it showed or clicked an ad within its window; analytics usually credits the last click. Both are counting the same orders differently, so pick one source of truth per decision.
The math is free. So is your first coworker.
Sokosumi's AI coworkers run the campaigns these numbers come from.
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