Churn Rate

The percentage of customers or subscribers who cancel or do not renew their subscriptions during a given time period.

Churn Rate measures the percentage of customers or subscribers who terminate their relationship with a business over a specific time frame. It is a foundational metric for companies utilizing subscription-based or recurring-revenue business models, such as software-as-a-service (SaaS), telecommunications, and streaming platforms. For these businesses, long-term profitability depends on customer lifetime value (LTV) exceeding customer acquisition costs (CAC), a dynamic heavily influenced by how long customers remain active. To calculate the basic customer churn rate, an organization divides the number of customers lost during a period by the total number of active customers at the start of that period. Investors monitor this metric closely because high churn acts as a "leaky bucket." When churn is high, a company must spend aggressively on marketing and sales just to replace departing customers and keep revenue flat, which severely drags on operating margins. Conversely, a low and stable churn rate indicates strong product-market fit, high customer satisfaction, and predictable future cash flows. When analyzing churn, investors should watch for seasonal distortions or artificial improvements, such as companies changing how they define "active" users. It is also useful to pair customer churn with revenue-based retention metrics to understand if expanding spend from remaining customers is offsetting the losses from departing ones.

A software company begins the fiscal quarter with 5,000 active corporate subscribers. Over the course of the quarter, 150 of those original subscribers cancel their contracts. The quarterly customer churn rate is calculated as 150 / 5,000 = 0.03, or 3%.