Churn Rate Calculator
This churn rate calculator works out how much of your customer base or recurring
This churn rate calculator works out how much of your customer base or recurring
How to use Churn Rate Calculator
- Choose whether you are measuring customer churn or revenue (MRR) churn.
- Enter your starting count and the amount lost during the period, plus expansion MRR if using revenue mode.
- Read your churn rate, retention, and net revenue retention below the inputs.
About Churn Rate Calculator
This churn rate calculator works out how much of your customer base or recurring revenue you lost over a period. In customer mode it divides customers lost by the customers you had at the start of the period, then shows your retention rate and an annualized churn figure if the same monthly rate repeated for a year. In revenue mode it calculates gross revenue churn from your starting MRR and the MRR lost to cancellations and downgrades, and optionally factors in expansion MRR to give net revenue churn and net revenue retention (NRR).
The math is standard SaaS and subscription formulas: churn rate = lost ÷ starting count, retention = 100% minus churn, and NRR = (starting MRR − churned MRR + expansion MRR) ÷ starting MRR. A negative net churn (NRR above 100%) means growth from your existing customers outpaced what you lost. The annualized figure is a simple compounding estimate and assumes a steady rate, so treat it as a directional guide rather than a forecast.
Everything runs privately in your browser. Nothing you type is uploaded, stored, or sent anywhere, so it is safe to use with real revenue and customer numbers.
Frequently asked questions
- How do I calculate churn rate?
- Divide the number of customers (or the amount of MRR) you lost during a period by the number you had at the start of that period, then multiply by 100. For example, losing 50 of 1,000 customers is a 5% churn rate. The calculator does this automatically for both customer counts and revenue.
- What is the difference between customer churn and revenue churn?
- Customer churn counts how many accounts you lost. Revenue churn measures the dollar value of the recurring revenue you lost, which can differ if the customers who leave pay more or less than average. This tool calculates both; switch modes with the dropdown at the top.
- What is net revenue retention (NRR) and why is it shown?
- NRR compares your ending revenue from existing customers to your starting revenue, including upgrades (expansion MRR) and subtracting churn and downgrades. An NRR above 100% means expansion outweighed losses, which is a strong signal for subscription businesses. It is calculated in revenue mode from your expansion MRR figure.
- How is the annualized churn figure calculated?
- It compounds your monthly churn rate over 12 months using 1 minus (retention rate raised to the 12th power). It assumes the same rate repeats every month, so it is an estimate for context, not a guaranteed yearly result.
- Is my data private?
- Yes. The calculator runs entirely in your browser with no network calls, uploads, or sign-up. Your customer and revenue numbers never leave your device.
- What time period should I use?
- Use any consistent window, most commonly a month. Just make sure the starting count, lost customers, and revenue figures all refer to the same period so the rate is accurate.