Marketing Metrics Every Business Should Track
The handful of marketing numbers that actually matter — conversion rate, CPC, ROAS, CAC, lifetime value and churn — what they mean, how they fit together, and which to ignore.
Churn Rate Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Churn rate
5.00%
- Retention rate
- 95.00%
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Churn Rate Calculator
The Churn Rate Calculator works out your churn rate, along with 1 related figure in an instant. Enter customers lost in period and customers at start of period and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the customers lost in period.
- Enter the customers at start of period.
- Read off your churn rate, together with retention rate — the calculator updates automatically, with no button to press.
Formula
The Churn Rate Calculator uses the formula:
Churn rate = Customers lost in period ÷ Customers at start of period × 100
Worked example
For example, with customers lost in period of 50 and customers at start of period of 1,000, the churn rate is 5.00%.
| Customers lost in period | 50 |
|---|---|
| Customers at start of period | 1,000 |
| Churn rate | 5.00% |
|---|---|
| Retention rate | 95.00% |
Results are estimates for educational use, not professional advice.
Key terms explained
- Churn rate
- The percentage of customers who stop using a product or service over a period.
Frequently asked questions
Divide customers lost during the period by customers at the start, then multiply by 100. Losing 50 of 1,000 customers is a 5% churn rate.
Retention is the share of customers you keep — 100% minus the churn rate. A 5% churn means 95% retention.
Lower is better and varies by industry. Subscription businesses often watch monthly churn closely, where even a few percent compounds over a year.
Improve onboarding, support and product value, engage at-risk customers early and address the common reasons people leave.
Enter the customers lost in period. Enter the customers at start of period. Read off your churn rate, together with retention rate — the calculator updates automatically, with no button to press.
Related guides
Churn Rate Table: Churn rate by Customers lost in period
Reference table of churn rate for Churn Rate across a range of customers lost in period values — exact, engine-computed figures you can read off at a glance.
How to Calculate Churn Rate: Formula, Steps & Examples
Learn how to calculate Churn Rate — the formula explained step by step, with worked examples and a free calculator to check your answer.