Churn Rate Calculator
Calculate churn rate — the percentage of customers who leave over a period.
The leak in the bucket
Churn rate is the percentage of customers who stop being customers over a period — the rate at which you lose them. This works it out from customers lost and the total, a critical metric for any subscription or recurring-revenue business, because churn is the leak that growth has to outpace.
Enter customers lost and the total to see the churn rate.
Why churn quietly kills growth
Churn is dangerous because it compounds against you: even a modest monthly churn rate means losing a large share of customers over a year, and every new customer you win first has to replace one who left before you grow at all. This is why a business can pour money into acquisition and barely move, if churn is high — it is filling a leaking bucket. Small improvements in retention have outsized effects, since reducing churn both keeps existing revenue and lets new customers add to growth rather than just replace losses. Watching churn, understanding why customers leave, and reducing it is often higher-leverage than chasing new ones. Retention is where sustainable growth lives.
Questions & answers
Why is churn so important?
Because it compounds — even modest churn loses a large share of customers over a year, and new customers must first replace those lost before you grow at all.
Why can reducing churn beat winning new customers?
Lower churn both preserves existing revenue and lets new customers add to growth instead of just replacing losses, so retention has outsized leverage.
Is anything uploaded?
No. The calculation happens in your browser.