Customer Acquisition Cost (CAC) Calculator

Total acquisition spend ÷ new customers = blended CAC.

Total marketing + sales spend (USD)

New paying customers acquired

Avg revenue per user / month (USD, optional)

Gross margin % (optional)

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Enter inputs to calculate

About this calculator

Free CAC calculator: enter your total marketing + sales spend and the number of new paying customers acquired in the same period — get your blended Customer Acquisition Cost in seconds. Includes payback-period guidance against your gross margin and average revenue per user, so you know whether your CAC is sustainable or burning runway. Built for indie founders evaluating channel performance and SaaS founders monitoring unit economics.

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Want this metric in context, not in isolation?

The Unbuilt Lab app runs your idea through a 6-document Blueprint Pack — and the Gtm doc covers Customer Acquisition Cost against your specific market data, competitors, and unit-economics targets. Not a generic calculator: tailored analysis.