Churn Rate Calculator
Customer churn, retention & average lifetime
How fast are customers leaving? Enter how many you started the period with and how many you lost to get your churn rate, retention rate and average customer lifetime.
Reading your churn rate
Churn rate is customers lost divided by customers at the start of the period, as a percentage. Retention is simply the rest. Losing 25 of 500 customers in a month is 5% monthly churn and 95% retention. If that's a monthly figure, the rough average customer lifetime is 1 ÷ churn — so 5% monthly churn implies a ~20-month lifetime. For SaaS, under ~5% monthly (or ~5–7% annually for the best) is a common target.
Churn Rate Calculator: frequently asked questions
How do I calculate churn rate?
Divide the customers you lost during the period by the number you had at the start, then multiply by 100. 25 lost out of 500 is 5% churn.
How does churn relate to customer lifetime?
For a steady monthly churn rate, average customer lifetime is roughly 1 ÷ churn. 5% monthly churn implies about a 20-month average lifetime.