Customer Acquisition Payback Period Calculator

A startup spending $240 to acquire a customer who pays $40/month has a 6-month payback period. That same model with a 20% monthly churn rate means the average customer churns before the acquisition cost is recovered. This is the math that separates sustainable growth from growth that consumes more cash than it creates. Customer Acquisition Payback Period is one of the most watched metrics in SaaS and subscription businesses. According to Profitwell's SaaS Benchmarks database, top-quartile SaaS companies maintain a CAC payback period under 12 months, while struggling companies often sit at 24 to 36 months. For e-commerce and non-subscription businesses, the metric adapts to use average order value and repurchase frequency. This calculator takes your customer acquisition cost, average revenue per customer, and gross margin to return your payback period in months, and whether your current model is sustainable.

This calculator takes your Customer Acquisition Cost (CAC), monthly or annual revenue per customer, and gross margin percentage to return the number of months required to recover the cost of acquiring each customer. For subscription businesses, it uses monthly recurring revenue per customer. For e-commerce, it uses average order value and purchase frequency. A payback period under 12 months is generally considered healthy for SaaS; under 6 months is excellent. The calculation tells you whether your current acquisition spending is economically justified by the revenue customers actually generate.