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CAC Payback Period Calculator

Enter CAC, monthly revenue per account, and gross margin to find the CAC payback period.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

The CAC payback period tells a SaaS company how many months it takes to recover what was spent acquiring a customer, calculated as CAC ÷ (monthly revenue per account × gross margin %) — using gross-margin-adjusted revenue because that’s the portion of revenue actually available to offset acquisition spend. A shorter payback period means cash is recovered and reinvestable faster.

Startup finance and growth teams, along with SaaS investors, treat this as a core efficiency metric — a payback period under 12 months is generally considered healthy for B2B SaaS — because it shows how quickly customer acquisition spend turns into usable cash rather than sitting locked up as risk. This calculator takes CAC, monthly revenue per account, and gross margin to return the payback period in months.

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