CAC Payback Period Calculator
See how quickly you earn back what you spend to acquire a customer. A short payback period frees up cash to reinvest in growth.
Calculate your payback period
Payback months equal CAC divided by monthly gross profit per customer.
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How it works
CAC payback tells you how long your gross profit takes to cover the cost of winning a customer.
Enter your CAC
Add the total sales and marketing cost to acquire one customer, including ads, commissions, and tooling.
Enter monthly gross profit
Add the gross profit a single customer generates each month after the direct costs of serving them.
Read your payback
We divide CAC by monthly gross profit to show how many months and days it takes to break even.
Frequently Asked Questions
Everything you need to know about CAC payback period.
CAC payback period is the time it takes to recover the money you spent to acquire a customer. It is measured by how long the gross profit from that customer takes to equal the acquisition cost. A shorter payback means you get your cash back faster.
Divide customer acquisition cost by the monthly gross profit per customer. For example, if CAC is 600 and monthly gross profit is 150, payback is 4 months. Use gross profit, not revenue, so the number reflects real recovered cash.
For many small businesses and SaaS companies, a payback under 12 months is healthy, and under 6 months is strong. The faster the better, because quick recovery lets you reinvest in acquiring the next customer with less risk.
Client-financed acquisition is when the gross profit you collect in the first 30 days covers your CAC, ideally about two times CAC plus delivery costs. When that happens, the customer effectively pays for their own acquisition. You recover cash almost immediately and can scale with far less risk because growth does not drain your bank account.
Recover cash faster with on-time payments
Invoice My Clients helps you bill and collect quickly, so the gross profit that pays back your CAC arrives sooner.
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