Churn rate calculator
Churn rate is the share of customers you lost over a period. It compounds quietly — a 5% monthly churn rate leaves only about half your customers after a year. Enter your numbers to see your rate and what it means over 12 months.
Runs entirely in your browser — real, deterministic math. Nothing is uploaded, stored or sent anywhere.
Your numbers
Churn rate = customers lost during the period ÷ customers at the start of the period.
Counts only — nothing leaves your browser. ClientTell tracks churn signals and at-risk accounts automatically from your real data.
You lost 50 of 1,000 customers in one month.
Monthly rate
5.0%
Annualised rate
46.0%
Remaining now
950
of 1,000 at period end
Held after 12 months
540
if the monthly rate continues, with no new customers
Annualised churn
46.0%
equivalent yearly loss at this monthly pace
Why churn deserves a weekly glance
Churn is the most expensive number in a subscription business: every point of churn removed compounds straight into retained revenue. Measuring it consistently is the precondition for reducing it.
Rate first, reasons second
The rate tells you the size of the leak; the exit feedback tells you where it is. Teams that skip the measurement skip straight to guessing about causes.
Monthly hides nothing
A monthly cadence smooths weekly noise while still moving fast enough to act. Annualised figures help you compare against industry benchmarks on the same scale.
Logo churn vs revenue churn
Losing ten small accounts can hurt less than losing one large one. Calculate churn on both counts and by segment — the blended rate flatters the dangerous story.
Want ClientTell to monitor churn — and flag the accounts that are cooling before they cancel automatically?
This calculator gives you a snapshot. ClientTell keeps the number live, reads the feedback behind it, and alerts you the moment a customer starts to slip.