Kelpi

CPA Calculator

Calculate cost per acquisition from spend and conversions, or switch to planning mode to find the max spend that fits a target CPA.

CPA calculator

Calculate cost per acquisition or plan the max spend that fits a target CPA.

Cost per acquisition

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CPA = spend / conversions

CPA is acquisition cost for the conversion you define. The cost-per-lead benchmark page is useful context, but CPA and CPL are not identical.

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Formula

Cost per acquisition, defined.

CPA is the cost of the acquisition event you choose. That event might be a purchase, booked call, lead, subscriber, or another conversion that matters to your funnel.

CPA = spend / conversions

Worked example

From spend to CPA.

If you spent $600 and generated 20 acquisitions, the math is 600 divided by 20. The result is a $30.00 CPA.

In planning mode, enter a target CPA and conversion count to get the spend ceiling for that goal.

How to read this result

Read CPA against your own economics.

CPA is only good or bad relative to margin, close rate, payback, and customer value. If the conversion is a lead, compare it with lead quality and sales close rate before changing budget.

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FAQ
Is CPA the same as CPL?
Not always. CPL measures cost per lead, while CPA can mean cost per purchase, booked call, subscriber, or another acquisition event.
How should I use a target CPA?
Set it from margin, close rate, and customer value, then use it to cap spend for a planned conversion volume.

Related: Facebook cost per lead benchmark

Related: Break-even ROAS calculator

More free tools: the full Kelpi toolbox