Churn Rate Calculator
Customer and revenue churn rate side by side, plus implied average customer lifespan.
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About the Churn Rate Calculator
Calculates customer churn rate (accounts lost) and revenue churn rate (MRR lost) side by side, plus an implied average customer lifespan from the churn rate — since the two churn measures commonly diverge.
- Enter customers at the start of the period and customers lost.
- Enter MRR at the start of the period and MRR lost.
- Read both churn rates side by side, plus the implied average customer lifespan.
500 customers at period start, 15 lost: a 3% customer churn rate. $24,500 MRR at start, $735 lost: also 3% revenue churn — implying a 33.3-month average customer lifespan.
Customer churn and revenue churn commonly diverge, since lost accounts aren't all the same size. The implied lifespan assumes a constant churn rate every month. Revenue churn here measures MRR actually lost only, not net movement including expansion.
- • If revenue churn is meaningfully higher than customer churn, larger accounts are churning disproportionately.
- • If revenue churn is lower than customer churn, you're mostly losing smaller accounts.
- • Pair this with the MRR/ARR Calculator's 12-month projection.
- ChartMogul — Churn Rate: How to Calculate and Reduce Customer Churn — accessed 2026-08-30
Illustrative estimate only, not financial or tax advice. Verify figures with a licensed adviser or your local tax authority.