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CAC Payback Period Calculator

Months to recover customer acquisition cost from monthly gross profit per customer — a key SaaS metric.

Enter values

Results update as you type.

Result

Payback period

10 months

Excellent (under 12 months).

About the CAC Payback Period Calculator

Months to recover customer acquisition cost from monthly gross profit per customer — a key SaaS metric.

Also known as: cac payback, customer payback period, payback period saas, customer-break-even.

How to use this calculator

  1. Enter cac, monthly revenue per customer, gross margin.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

Payback = CAC ÷ (ARPU × gross margin)

Worked example

Using the values pre-filled in the calculator above:

  • CAC = 1,200
  • Monthly revenue per customer = 150
  • Gross margin = 80 %

the calculator returns:

  • Payback period: 10 months