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Marketing Payback Calculator

Enter the CAC and monthly margin to get the 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 marketing payback period answers a simple question: how many months does it take for a newly acquired customer to earn back what it cost to acquire them? The formula is CAC (customer acquisition cost) ÷ monthly gross margin per customer — so a $300 CAC against $50 of monthly margin per customer gives a 6-month payback.

Subscription and SaaS businesses, growth marketers, and investors evaluating unit economics watch this number closely because it directly measures cash-flow risk: a payback period under roughly 12 months is generally considered healthy for SaaS, while longer paybacks mean the company is fronting more cash per customer before that spend turns profitable, which matters a lot for how fast it can safely scale acquisition spend.

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