CAC Payback Period
Find out how many months it takes to earn back the cost of acquiring a new customer.
Your Numbers
Enter three values to calculate your payback period.
Total spent to acquire one new customer
How much one customer spends per month
Revenue minus cost of goods, as a %
Payback Period
Enter your values on the left to see how quickly you earn back your customer acquisition cost.
Formula
CAC ÷ (Monthly Revenue × Margin%) = Payback Months
Pro Tip
Payback period tells you how fast your business can fund its own growth. If it takes > 12 months to earn back your acquisition cost, growth depends on outside cash. Aim for < 6 months to scale sustainably.
Why Payback Matters
ROAS is a vanity metric. LTV is a prediction. Payback period is reality. It tells you how fast your business can fund its own growth from the customers you already have.
The Self-Funding Cycle
If your payback is 1 month, you can reinvest that profit 12 times a year. If it's 12 months, you can only reinvest once.
De-Risking Scaling
Shorter payback periods mean you're less exposed to changes in ad costs or sudden drops in demand.
How to Shorten Payback
- Increase AOV:
Bundles and upsells increase the contribution margin of the first purchase.
- Improve Margins:
Lower COGS or shipping costs means more of every dollar goes to paying back the CAC.
- Reduce CAC:
Better creative or higher conversion rates drive down the initial investment needed.