Churn Rate Calculator
Track customer churn and monthly subscriber loss, then see your retention rate in one click.
This calculator runs entirely in your browser. Nothing you type is uploaded or stored.
How to use this tool
Pick a time period you want to measure, such as a month or a quarter. Enter the number of customers or subscribers you had at the start of that period, then enter how many of them left during it. Click "Calculate churn" and the tool shows your churn rate as a percentage, along with the retention rate and the number of customers you kept. Use this as a quick churn rate tracker to watch your subscription metrics over time.
The formula and how it works
Retention rate (%) = 100 - Churn rate
Churn rate measures the share of your existing customers who stopped paying or canceled during a set period. You divide the customers lost by the customers you had at the start, then multiply by 100 to get a percentage. Only count customers who were already on board at the start of the period; new sign-ups that joined and left within the same window are usually tracked separately. The retention rate is simply the mirror image: whatever you did not lose, you kept.
A real example
Say a subscription app starts the month with 1,000 active subscribers. By the end of the month, 50 of them have canceled. The monthly subscriber loss is 50, so the churn rate is (50 / 1,000) x 100 = 5%. The retention rate is 100 - 5 = 95%, which means 950 customers stayed. Tracking that 5% each month lets you spot whether customer churn is creeping up before it becomes a serious revenue problem.
Common questions
What counts as a good churn rate?
It depends on your market. Many consumer subscription products aim for monthly churn under 5 to 7 percent, while strong business software often sees monthly churn closer to 1 to 2 percent. Lower is better, and the trend over time matters more than any single month.
What is the difference between churn rate and retention rate?
They are two sides of the same coin. Churn rate is the percentage of customers you lost in a period; retention rate is the percentage you kept. If your churn rate is 5 percent, your retention rate is 95 percent, because the two always add up to 100 percent.
Should I count new customers in the starting number?
No. Use only the customers who were already active at the beginning of the period. Counting people who signed up mid-period mixes acquisition with churn and makes your monthly subscriber loss harder to read accurately.
Can I use this for revenue churn instead of customer churn?
Yes, in a basic way. If you enter your starting recurring revenue in place of starting customers and the revenue lost to cancellations as the lost amount, the same formula gives you a simple revenue churn percentage. For detailed metrics, account for upgrades and downgrades separately.
How often should I track churn?
Monthly is the most common cadence for subscription businesses because it lines up with billing cycles. Some teams also review churn quarterly to smooth out short-term noise and see the longer trend in their subscription metrics.
This tool provides estimates for educational and planning use only and is not professional financial advice.