Churn Rate Calculator
Customer churn & retention rate over a period.
Calculate your customer churn rate — the share of customers lost over a period — plus the retention rate and the implied average customer lifespan. Enter customers at the start and how many churned. Runs fully in your browser — nothing is uploaded.
How to use Churn Rate Calculator
Enter starting customers
Type how many customers you had at the start of the period into this free online churn rate calculator to set the base for the churn percentage.
Add churned customers
Enter the number of customers lost during the period so the tool can instantly compute your customer churn rate against the starting count.
Read churn rate
The hero card shows your churn rate percentage at once, calculated as customers lost divided by customers at start, multiplied by one hundred.
Check retention rate
View the retention rate alongside churn, since retention equals one hundred percent minus your churn rate, giving a clear loyalty snapshot instantly.
See customer lifespan
Read the estimated average customer lifespan in months, derived from your monthly churn rate, to gauge how long customers typically stay.
Share your result
Use the share link to send your churn and retention numbers to teammates, with every figure recalculated live and privately in your browser.
Frequently asked questions
What is a good churn rate?
It varies by market, but many healthy SaaS businesses target monthly customer churn under ~2–3% (lower for annual contracts). Early-stage and SMB-focused products often see higher churn.
Customer churn vs revenue churn?
Customer churn counts accounts lost. Revenue churn counts the MRR lost — which can differ if the customers who leave are bigger or smaller than average. This tool measures customer churn.
How does churn relate to lifespan?
If churn is steady each month, the average customer stays roughly 1 ÷ monthly churn rate months. So 2% monthly churn implies an average lifespan of about 50 months.
How do I calculate my churn rate?
Divide the customers you lost during a period by the customers you had at the start, then multiply by 100. This free churn rate calculator does it instantly — for example, 25 lost out of 500 is a 5% churn rate — and also shows your retention rate.
What’s the difference between churn rate and retention rate?
They’re two sides of the same coin: retention rate = 100% − churn rate. If your monthly churn rate is 5%, your retention rate is 95%. This calculator reports both so you can track customer loss and loyalty together.
How do I reduce customer churn?
Focus on onboarding (customers who reach value fast stay longer), proactive support, catching at-risk accounts early, and offering annual plans that lock in commitment. Even a one-point drop in monthly churn meaningfully extends average customer lifespan and lifts LTV.
What's the difference between monthly and annual churn?
Monthly churn is the share of customers lost in a single month; annual churn is the share lost over a year. They aren't simply 12× each other because of compounding — roughly, annual retention = (1 − monthly churn)^12, so 5% monthly churn is closer to ~46% annual churn, not 60%.
Is my data sent anywhere?
No. Everything is calculated in your browser with JavaScript — nothing you enter is uploaded.
Related tools — SaaS Metrics
- MRR Calculator — Monthly Recurring Revenue from customers × ARPA.
- ARR Calculator — Annual Recurring Revenue from customers × contract value.
- LTV Calculator — Customer Lifetime Value & LTV:CAC ratio.
- Burn Rate Calculator — Net burn & how many months of runway you have left.