Calculators
Churn Rate Calculator
Calculate customer churn, annualised churn, average customer lifetime and revenue churn for a period.
- Runs in your browser
- Nothing uploaded
The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Monthly retention reporting
- Converting monthly churn into an annual figure
- Estimating customer lifetime for LTV
- Comparing logo churn with revenue churn
About this tool
What the Churn Rate Calculator does
Churn rate is the share of customers lost during a period, measured against the customers you started with. This calculator also annualises a monthly rate, converts it to an average customer lifetime and, if you add MRR, measures revenue churn.
Formula
- Churn rate = customers lost ÷ customers at the start × 100
- Annualised churn = 1 − (1 − period churn)^(periods per year)
- Average lifetime = 1 ÷ churn rate (in periods)
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Customers at the start | 1,200 |
| Customers lost | 60 |
| New customers | 150 |
| Period | Month |
| MRR at the start (optional) | $60,000 |
| MRR lost (optional) | $2,400 |
| Result | Value |
|---|---|
| Churn rate for the period | 5.00% |
| Annualised churn | 46.0% |
| Average customer lifetime | 20 months |
| Customers at the end | 1,290 |
| Revenue churn | 4.00% |
How to read the result
Do not divide by the end-of-period count or include new customers in the denominator; both understate churn when you are growing.
Annualising compounds the rate. A 5% monthly churn is about 46% a year, not 60%, because each month churns from a smaller base.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
Divide the number of customers lost in a period by the number you had at the start of it, then multiply by 100.
Customer churn counts accounts lost. Revenue churn measures the recurring revenue lost, which weights larger customers more heavily.
Annual churn = 1 − (1 − monthly churn)^12. A 2% monthly churn is about 21.5% a year.
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