Customer Retention Rate Calculator
Calculate the percentage of customers retained over a period.
About this calculator
Total customer count can grow even while a business is quietly bleeding existing customers, because new signups mask the loss, which makes retention rate a more honest signal than a raw headcount comparison. This calculator takes customers at the end of a period, subtracts new customers acquired during that same period, and divides the result by customers at the start, isolating how many of your original customers actually stuck around. It's built for businesses tracking whether their existing customer base is stable, useful for board updates, cohort analysis, or deciding whether to invest more in acquisition versus retention. Doing this subtraction manually is simple arithmetic, but it's a step people skip, comparing end count directly to start count without removing new customers inflates the apparent retention and hides a real churn problem.
Worked example
480 at end, 0 new, 500 at start
Result: 96.00%
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