Churn Rate Calculator
Calculate customer churn percentage for a period.
This churn rate calculator finds the percentage of customers lost over a given period, a critical retention metric for subscription businesses that directly feeds into customer lifetime value calculations.
Enter your starting customer count and customers lost during the period, and the calculator returns your churn rate.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 25 customers lost from a starting base of 500 | Churn rate = 5% | Churn = (25 ÷ 500) × 100 = 5%. |
| 60 customers lost from a starting base of 800 | Churn rate = 7.5% | Churn = (60 ÷ 800) × 100 = 7.5%. |
The Churn Rate Formula
Churn rate = (customers lost during period / customers at start of period) x 100. Losing 25 customers from a starting base of 500 gives a churn rate of (25/500) x 100 = 5% for that period, typically measured monthly or annually depending on the business.
Why Even Small Churn Differences Compound Over Time
Monthly churn rates compound over a year - a 5% monthly churn rate results in roughly 46% annual customer loss (not simply 5% x 12 = 60%, since the shrinking customer base each month reduces the absolute number lost) - which is why even modest-looking monthly churn numbers can represent a much larger long-term retention challenge than they first appear.
How to Use the Churn Rate Calculator
- Open the Churn Rate Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the churn rate calculator works.
Frequently Asked Questions
How do you calculate customer churn rate?
Divide the number of customers lost during a period by the number of customers at the start of that period, then multiply by 100 for a percentage.
What is a good monthly churn rate for a SaaS business?
It varies by market segment, but many benchmarks suggest under 2-3% monthly churn for smaller-business-focused SaaS, while enterprise SaaS often targets even lower rates given larger, longer-term contracts.
How does monthly churn translate to annual churn?
Annual churn isn't simply monthly churn x 12, since the customer base shrinks each month - it compounds, so a 5% monthly churn rate results in roughly 46% annual churn rather than a simple 60%.
How do I use this churn rate calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Churn Rate Calculator calculate?
Calculate customer churn percentage for a period. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this churn rate use?
The formula is: churn = lost customers / starting customers * 100. Churn rate as a subscription business metric grew in importance alongside the rise of the SaaS business model in the 2000s, since recurring-revenue businesses depend on retention in a way one-time-purchase businesses don't - a key mathematical subtlety is that monthly churn compounds over a year rather than simply multiplying by 12, since the customer base shrinks with each passing month.
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Last updated: September 27, 2026.