Churn is the metric that determines whether your subscription business grows or runs on a treadmill. Here is what it means, how to calculate it, and what to do when it's too high.
Churn rate is the percentage of customers or revenue that your subscription business loses in a given period. It is the single most important metric for understanding whether your business is healthy — and the one that most solo founders misdiagnose.
Customer churn rate: the percentage of customers who cancel in a given month. If you start the month with 100 customers and 8 cancel, your monthly customer churn rate is 8%.
Revenue churn rate (MRR churn): the percentage of monthly recurring revenue lost in a given month. If you lose $640 of $8,000 MRR, your revenue churn rate is 8%. These two numbers are often similar but can diverge — especially if your customers on different price points churn at different rates.
Monthly churn rate = (customers lost this month ÷ customers at start of month) × 100. Example: 8 cancelled ÷ 100 at start = 8% monthly churn.
Annual churn rate is not monthly churn × 12. It is a separate calculation: (customers at start of year − customers at end of year) ÷ customers at start of year. A business with 5% monthly churn has approximately 46% annual churn — a fact that surprises most founders who only track the monthly number.
Early churn (days 1–14). The customer never activated. They signed up, didn't understand the value, and left before forming a habit. This is an onboarding problem, not a product problem. The fix: identify the moment when activated customers first experience the core value and make that moment happen faster and more reliably for every new customer.
Mid-term churn (weeks 2–8). The customer activated but didn't build a habit. They used the product a few times and drifted away. This is a habit formation problem. The fix: identify what retained customers do differently in the first 30 days and build that behaviour into the onboarding sequence.
Late churn (months 2+). The customer was retained but eventually cancelled. Usually a product gap — the product stopped solving their problem as their situation evolved, or a competitor solved it better. The fix requires product work or re-positioning, not onboarding changes.
For a solo-founder subscription product: below 5% monthly is healthy. 5–8% is a warning sign. Above 8% is a structural problem that will prevent any meaningful growth regardless of acquisition volume.
Annual churn benchmarks: below 20% is good for SMB-focused products. Below 10% is good for products with higher ACV. If your annual churn is above 40%, you're replacing your entire customer base faster than you can grow it.
Step 1: find out when churn is happening. Look at the cancellation dates relative to signup dates. Is most churn in the first 14 days? Weeks 2–8? Later? The timing determines which lever to pull.
Step 2: email 10 recent churned customers with one question: "Was there a specific moment when you decided to cancel?" Not a survey — a personal email that invites a real answer.
Step 3: apply the fix for the type of churn you diagnosed. Early churn → fix onboarding. Mid-term churn → fix habit formation. Late churn → fix product or positioning.
Tell Marcus your churn rate and when customers are leaving. You'll get a specific diagnosis and one fix to implement this week.
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