Churn Rate: Formula, Revenue Churn and What One Cancellation Does to It

What are customer churn and revenue churn?

Customer churn counts people. Take the customers you had on the first day of the month, count how many of them are gone by the end and divide. New customers who joined during the month are left out, because they were not in the starting group. Revenue churn counts money: the monthly recurring revenue those lost customers represented, divided by the monthly recurring revenue you started with.

The two rates differ here because the customers who left were on higher plans. That pattern is worth noticing: if revenue churn exceeds customer churn, your larger customers are leaving faster than the small ones, and the cause is probably a feature or a price that matters more to them. The numbers are invented for the example and are not a benchmark.

Why does a small monthly rate add up to a large annual loss?

Because churn compounds. If you lose 5% of the remaining customers each month, after twelve months you keep 0.95 multiplied by itself twelve times, which is about 54% of the original group. It is not 40%, as multiplying 5% by twelve would suggest, and it is not 95%. The loss each month is smaller than the last in absolute numbers, since there are fewer people to lose.

A rough rule links churn to customer lifetime. If the monthly rate stays constant at 5%, the average customer stays about 20 months, which is one divided by 0.05. Treat it as a back-of-envelope estimate that assumes a steady rate, and not as a forecast. It is helpful for one decision: how much you can afford to spend finding a customer, since a customer’s expected lifetime times what they pay is what they are worth.

Why do customers leave, and which kinds can you fix?

• Voluntary churn. The customer decided to cancel. Ask them one short question on the way out: “What was the reason?” Group the answers monthly.
• Involuntary churn. A card expired or a payment failed, and the customer never meant to leave. Retry failed payments and send a clear email, because this is the cheapest churn to recover.
• Trial drop-off. People who never paid are not churn. That is a conversion rate between trial and paid, so keep it in a separate number.
• Seasonal or project-ended. Some customers leave because the job ended, not because of your product. Record that as its own reason.

Do not assume you have a product problem before you have a reason list. Three cancellations with three different reasons is a small sample, and the useful response is to write back to each of them personally.

How do you read churn with only a few dozen customers?

Report the count as well as the rate, and look at a trailing three-month view instead of a single month. With 40 customers, one cancellation is 2.5 points. If a rate swings from 2.5% to 7.5% in one month, the real story is that two more people left, and you should read their reasons before reacting. Publishing a monthly figure with a single decimal place implies precision you do not have.

Skip benchmarks. What counts as a healthy rate depends on the price, the type of customer, whether people pay monthly or annually, and how essential the product is to their work. The comparison that helps is your own earlier numbers, with the same definition. If this quarter’s rate is lower than last quarter’s on a larger base, something is improving, regardless of what other companies report.

If you do not yet have paying customers, churn is not your metric. Look at retention rate for usage, and at activation rate before that. The get your first paying customer playbook covers how to reach the point where churn starts to matter.

Which mistakes distort the number?

• Including new customers in the denominator. Use the starting count only, or every month looks better than it was.
• Mixing monthly and annual plans without saying so. An annual customer can only churn once a year, so a month with no annual renewals shows no churn from them. Report each plan type separately if the mix is large.
• Counting refunds and downgrades inconsistently. Decide whether a downgrade is a loss of revenue in your revenue churn and write the rule down.
• Treating one-off sales as churn. A single-payment product has no churn; it has repeat purchases, which is a different metric.

Pair this number with MRR, because churned revenue is one of the movements that explains why monthly recurring revenue rose or fell. When you launch your product free, you start collecting your first cohort. If you are still deciding what to build as a subscription, the legal tool ideas on the board are one place to look for a problem that comes back every month.