Marketing
Churn Rate Calculator
Measure customer churn percentage or reverse the formula to estimate customers lost and starting customer volume.
Enter your starting customers and churn inputs.
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Churn Formula
Calculate Rate
Rate = (Lost / Starting) x 100
Calculate Lost
Lost = (Rate / 100) x Starting
Calculate Starting
Starting = Lost / (Rate / 100)
What is churn rate?
Churn rate tells you how quickly customers are leaving. Subscription teams, SaaS operators, and ecommerce brands use it to diagnose retention issues and understand how durable their customer base really is.
Even modest improvements in churn can have an outsized effect on growth because retained customers continue generating future revenue. That is why churn is often monitored alongside CLV, CAC, and expansion revenue.
Frequently asked questions
What is churn rate?
Churn rate measures the percentage of customers who leave during a given period compared with the number you started with.
How do I calculate churn rate?
Divide customers lost by starting customers and multiply by 100. If you lose 25 out of 500 customers, churn is 5%.
Why does churn matter so much?
Retention has a direct impact on growth, CLV, and acquisition efficiency. High churn makes it harder for revenue gains to compound.
What is a good monthly churn rate?
For SaaS businesses, a monthly churn rate below 2% is generally considered healthy. Best-in-class companies often achieve under 0.5% monthly churn, which translates to retaining more than 90% of revenue annually.
How does churn rate affect customer lifetime value?
Higher churn shortens the average customer lifespan, which directly reduces CLV. If you halve your churn rate, you roughly double average customer lifespan and therefore approximate CLV, assuming spend per customer stays constant.