Definition: Metric measuring the percentage of customers who stop using a product or cancel their subscription in a given period, a key indicator of business health.
— Source: NERVICO, Product Development Consultancy
What is Churn Rate
Churn rate is the metric that measures the percentage of customers who stop using a product or cancel their subscription during a given period. It is expressed as a percentage: if a SaaS service has 1,000 customers at the start of the month and 50 cancel, the monthly churn is 5%. There is also revenue churn, which measures revenue lost from cancellations and downgrades, which is relevant when not all customers pay the same amount.
How it works
Churn is calculated by dividing the number of customers lost in a period by the number of customers at the start of that period. It can be measured at different granularities: daily, weekly, monthly, or annually. For B2B SaaS businesses, acceptable monthly churn is typically below 2-3% (equivalent to 20-30% annual churn). For B2C products, thresholds are higher. Net revenue churn accounts for expansion of existing accounts (upselling) and can be negative, indicating that revenue from existing customers grows more than what is lost from cancellations.
Why it matters
Churn is the most critical indicator of long-term health for a subscription-based business. A 5% monthly churn seems small, but it means losing half the customer base in a year. No level of customer acquisition compensates for high churn sustainably. Reducing churn has a direct impact on customer LTV (lifetime value) and, therefore, on business profitability.
Practical example
A SaaS product has 8% monthly churn. The team analyzes data and discovers that 60% of cancellations happen within the first 30 days. They implement a guided onboarding program with personalized sessions for new customers. Six months later, first-30-day churn drops from 60% to 25%, and overall monthly churn decreases to 4%. Average customer LTV increases from 8 months to 14 months, drastically improving the business’s unit economics.