Churn Rate Calculator
Calculate your customer churn rate, retention rate, annualized churn, and average customer lifetime to understand and improve customer retention.
Total active customers at the beginning of the period
Number of customers who churned during this period
Time period for the churn calculation
Enter your customer numbers and period, then click Calculate to see your churn rate.
How Churn Rate Works
What is Churn Rate?
Churn rate measures the percentage of customers who leave your business during a specific time period. It is the inverse of retention rate and is one of the most important metrics for any subscription or recurring-revenue business. A high churn rate means you are losing customers faster than you can replace them, which leads to declining revenue and growth.
How to Calculate Churn Rate
The churn rate formula is straightforward:
- Churn Rate = (Customers Lost During Period / Customers at Start of Period) x 100
- Retention Rate = 100 - Churn Rate
For example, if you start the month with 1,000 customers and lose 50, your monthly churn rate is 5% and your retention rate is 95%.
Annualizing Monthly Churn
Monthly churn compounds over time, so a 5% monthly churn does not simply equal 60% annual churn. The correct formula is:
- Annual Churn = 1 - (1 - Monthly Churn Rate / 100)^12
A 5% monthly churn actually translates to about 46% annual churn when compounded. This is why even small reductions in monthly churn can have a dramatic impact on your annual retention numbers.
Average Customer Lifetime
Your average customer lifetime is directly tied to your churn rate. The formula is:
- Average Lifetime = 1 / Monthly Churn Rate (in months)
With a 5% monthly churn, the average customer stays for 20 months. Reducing churn to 3% extends that to about 33 months. Combining this with customer lifetime value (CLV) helps you understand how much each customer relationship is worth and how much you can afford to spend on acquisition.
Why Churn Matters
Even a small improvement in churn can significantly impact revenue. Reducing monthly churn from 5% to 4% may seem minor, but over a year it means retaining roughly 8% more customers. For a company with $1M in annual recurring revenue, that difference could represent $80,000 or more in preserved revenue.