Churn Rate Calculator
Measure how much of your customer base and revenue you lose in a period — and what you keep.
This free churn rate calculator works out how much of your customer base and revenue you lose over a period — and how much you keep. Enter the customers and MRR you started with and what you lost, and it returns your customer churn rate, revenue churn rate and retention instantly.
Churn rate is the single biggest drag on compounding growth. A few points of monthly churn quietly cap how high your MRR can climb no matter how much new business you add, which is why founders track it as closely as new bookings.
How to calculate churn rate
There are two churn rates worth tracking. Customer churn counts the logos you lose: divide the customers lost in a period by the customers you had at the start. Revenue churn weights each loss by its MRR: divide the MRR lost by the MRR you had at the start. Pick one period — usually a month — and measure it consistently.
The two rates diverge when the accounts leaving are larger or smaller than average. If revenue churn runs higher than customer churn, your bigger accounts are the ones cancelling — a more urgent problem than the logo count alone suggests.
Customer churn rate = customers lost ÷ customers at start of period × 100. Revenue churn rate = MRR lost ÷ MRR at start of period × 100.
Start the month with 1,000 customers and $50,000 MRR. You lose 30 customers worth $2,000 of MRR. Customer churn = 30 ÷ 1,000 = 3%. Revenue churn = $2,000 ÷ $50,000 = 4%. Customer retention for the month is 97%.
Stop estimating. See your real numbers.
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