CPA Calculator
Divide spend by conversions to get your cost per acquisition, with context on setting CPA targets.
Cost per acquisition
What it measures
CPA divides spend by the conversions it bought. What counts as a conversion is your call: a sale, a signup, a qualified lead.
Why it matters
CPA is the operating number of paid media. Every bid strategy and budget decision eventually reduces to whether the CPA is worth paying.
A worked example
4,000 of spend producing 50 conversions is an 80 CPA. Whether that is good depends on what a conversion is worth downstream.
How to read and improve it
Set the target CPA from the economics backwards: value per conversion times acceptable share, not from what the account happens to deliver.
Frequently asked questions
CPA or CAC?
CPA is per conversion in a channel. CAC is per customer across all spend. A form fill CPA of 80 can easily be a CAC of 800.
Why did my CPA rise?
Usually rising CPCs or falling conversion rate. Split the two before reacting; the fixes are different.
More in Paid media: ROAS Calculator · Break Even ROAS Calculator · PPC ROI Calculator
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