Calculators · Free to use
Churn Rate Calculator
Churn quietly caps your growth. Enter customers at the start of a period and how many churned to get churn %, retention % and the average customer lifetime that implies.
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How to use the churn rate calculator
- 1Enter customers (or MRR) at the start of the period.
- 2Enter how many customers (or how much MRR) you lost.
- 3Read churn %, retention % and implied average lifetime.
This tool runs in your browser. The text, files and values you enter are not uploaded to our server.
About the churn rate calculator
Churn rate is the share of customers (or revenue) lost in a period: churned ÷ starting count × 100. It silently caps growth — at 5% monthly churn the average customer lasts only 20 months. This calculator returns churn %, retention % and the implied average customer lifetime, and works the same for revenue (MRR) churn.
Frequently asked questions
Is this tool free?
Yes — completely free, no signup, no watermark and no limits. Startup OG funds the site through its directory and partner program, not paywalled tools.
How is churn rate calculated?
Churn rate = customers lost during the period ÷ customers at the start of the period × 100. Use MRR instead of customer counts to get revenue churn.
What is a good churn rate?
For SMB SaaS, ~3–5% monthly is common; for products selling to enterprises, sub-1% monthly is the target. Annual contracts naturally show lower monthly churn.
What is negative churn?
When expansion revenue from existing customers exceeds the revenue lost to churn, net revenue churn is negative — the strongest signal of product-market fit.