What is a Churn Rate?
The percentage of customers who stop doing business with you over a given period.
How Churn Rate Works
Churn rate measures the percentage of customers who stop doing business with you during a specific time period. For subscription businesses, it's customers who cancel. For e-commerce, it's customers who don't repurchase within an expected timeframe.
Churn rate is the inverse of retention rate. High churn forces continuous heavy acquisition spending just to maintain revenue—the "leaky bucket" problem. Reducing churn often delivers better ROI than increasing acquisition because saved customers don't require additional CAC. Churn analysis should identify: when customers churn (early vs. late lifecycle), why they churn (product issues, competitive offers, life changes), and which segments churn most. Effective churn reduction requires both predictive identification of at-risk customers and intervention strategies to retain them.
Frequently Asked Questions
What is a Churn Rate?
The percentage of customers who stop doing business with you over a given period.
Churn rate measures the percentage of customers who stop doing business with you during a specific time period. For subscription businesses, it's customers who cancel. For e-commerce, it's customers who don't repurchase within an expected timeframe.
Why is Churn Rate important?
Churn is the silent killer of growth—high churn means you're running hard just to stay in place, with acquisition spend replacing lost customers rather than growing the base. A 5% monthly churn rate means losing 46% of customers annually. Reducing churn has compounding returns: saved customers continue generating revenue and referrals while requiring no acquisition cost. For subscription businesses especially, churn reduction is often the highest-leverage growth lever.
How do you calculate Churn Rate?
Churn Rate = (Customers Lost During Period ÷ Customers at Start of Period) × 100. For example, if you started the month with 1,000 customers and lost 50, monthly churn is (50 ÷ 1,000) × 100 = 5%.