Churned MRR Calculator

Churned MRR is the monthly recurring revenue you lose when customers cancel their subscriptions entirely, and the churn rate that flows from it is one of the most important health metrics in any subscription business. This calculator takes the recurring revenue lost from customers who left in a period and divides it by the recurring revenue you started the period with, giving your gross MRR churn rate as a percentage. You enter churned MRR, the total monthly recurring revenue from cancelled accounts, and starting MRR, the recurring revenue on the books at the start of the period, and the tool returns both the dollar loss and the rate. It also shows the MRR you retained, so you can see the flip side of the same coin. Founders, finance teams and customer success leaders track churn rate closely because even a modest monthly rate compounds heavily over a year and can quietly cap your growth no matter how strong new sales are. A few good practice tips will sharpen the figure. First, this is gross revenue churn, so it counts only customers who fully cancelled, not those who downgraded, which belong in contraction MRR. Second, measure churned and starting MRR over the same period so the rate is meaningful and comparable month to month. Third, look beyond the headline number to which customers are leaving, since losing a few large accounts is very different from losing many small ones. Watching churned MRR and the churn rate consistently, alongside expansion and contraction, gives you an honest view of retention and tells you whether your recurring revenue base is solid enough to build durable growth on.

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Churn rate = churned MRR / starting MRR x 100. Estimate only, not financial or tax advice.