How to use this tool
Replace the example values with your own inputs. Results update as you type. Keep your measurement period and definitions consistent, then use the result to inform the next question in your advertising review.
The formula
CAC payback months = CAC ÷ (monthly revenue per account × gross margin).
Worked example
600 CAC, 100 monthly revenue and 80% gross margin gives a 7.50-month payback period.
What the result can tell you
This steady-state estimate excludes churn, expansion, collection delays and changing margins. It is not a cash-flow forecast.
Is it free, and where do my inputs go?
The tool runs in your browser without an account or an ad-platform connection. Calculation inputs are not sent to WhatWins. If you save a scenario, it stays in this browser on this device.