CAC Payback Period Calculator
Determine how long it takes to recoup your customer acquisition spend.
Formula
Payback Period = CAC ÷ (ARPU × Gross Margin)What is Payback Period?
The CAC Payback Period is the number of months it takes for a newly acquired customer to generate enough gross profit to reimburse the cost of acquiring them.
How to calculate Payback Period
Take your Customer Acquisition Cost (CAC) and divide it by the monthly gross profit per user (ARPU multiplied by Gross Margin percentage).
Example calculation
If your CAC is $300, your ARPU is $50, and your Gross Margin is 80% ($40/month profit), the math is: $300 ÷ $40 = 7.5 Months Payback Period.
Why Payback Period matters for SaaS
Payback period dictates the capital efficiency of your startup. A short payback period (under 12 months) means you can reinvest your cash back into marketing rapidly, fueling hyper-growth without constantly raising external capital.
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