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Finance
Customer Payback Period Calculator
How many months until a customer pays back their CAC?
Inputs
$
$
%
Monthly gross profit / customer
$60.00
Payback period
10.0 mo
Best-in-class SaaS: < 12 months
Payback in days
300
About this tool
Enter CAC, monthly ARPU, and gross margin to see how many months it takes each customer to pay back the cost of acquiring them. Under 12 months = healthy SaaS.
What it does
- •Months to payback
- •Gross-margin adjusted
- •Days to payback
- •SaaS benchmark verdict
Use cases
- ★Unit economics
- ★Fundraising diligence
- ★Ad-spend approval
FAQ
Formula?
Payback (months) = CAC / (Monthly ARPU × Gross Margin %).
What's healthy?
Best-in-class SaaS: under 12 months. 12–18 is acceptable, over 24 is a red flag.