Why churn rate matters to a first-time founder
Churn rate sets a ceiling on growth. If 5% of customers leave every month, you must win that many new ones just to stand still, and the bigger you get, the more you lose each month. High churn also makes every pound spent on acquisition worth less, because customers leave before repaying it. It is often the first number investors ask about in a subscription business.
Examples of churn rate
You start March with 40 paying freelancers, and four do not renew. The churn rate is 10% for the month. If those four were on the most expensive plan, the money you lost matters more than the count of names. Follow the version of the rate that matches how you get paid.
Common misunderstanding
People treat customer churn and revenue churn as the same number. Customer churn counts the people who left; revenue churn counts the money they took with them. Lose four small accounts out of forty and customer churn is 10%, while revenue churn might be 3%. Lose one large account and the reverse can happen. Track both, and say which churn rate you are quoting.
When to use it
Measure the churn rate as soon as customers are in a position to leave. With only ten customers, one cancellation produces a frightening percentage. Read the reason alongside the rate, and do not average it into something that feels comfortable.