Calculator · 052
Payback Period Calculator
Measure how long it takes to recover acquisition cost — and decide whether growth is self-funding or tying up too much cash.
Payback period
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AverageFormula
Payback period = CAC / Monthly gross profit per customer
Understanding payback period
Reference material — the calculator above stays the primary tool.
What payback period measures
Payback period is how many months of gross profit it takes to recover the cost of acquiring a customer — CAC divided by monthly gross profit per customer. It measures the cash efficiency of growth: how long each acquisition ties up money before it turns positive.
Shorter is better, and it governs how fast you can reinvest: a short payback recycles cash into more growth, while a long one starves it.
How to read your result
The result is labelled against a SaaS benchmark, with faster payback marked stronger:
Strong — well under the benchmark; growth is largely self-funding. Average — near the benchmark; tightening CAC or margin pays off. Low — above the benchmark; acquisition ties up cash too long to scale safely.
Payback benchmarks by motion
Payback norms vary by motion and margin. Treat these as orientation, not targets.
| Context | Typical median |
|---|---|
| Self-serve / PLG | <6 months |
| SMB sales | 6–12 months |
| Mid-market | 12–18 months |
| Enterprise | 18–24 months |
Levers that shorten payback
Two inputs move it: lower CAC through cheaper, better-converting acquisition, or raise monthly gross profit through pricing and margin. Both shorten payback and free cash to reinvest. Model the change as a scenario above.
Payback in context
Read payback alongside LTV and the LTV:CAC ratio, which the related tools cover. A short payback with weak LTV may signal underpricing, while a long payback can be fine if LTV is large and retention strong — judge them together.