Churn Rate Calculator

Churn is the share of what you had at the start of a period that you no longer have at the end. Customer churn counts accounts. Revenue churn counts dollars, and it's usually the more honest figure because customers don't leave in equal sizes. Losing three small accounts and keeping one large one can look fine on a customer basis and fine on a revenue basis. Losing the large one is a different story, and only revenue churn shows it.

Net revenue churn subtracts expansion, meaning upsell and price increases from existing customers, from the revenue you lost. When expansion exceeds loss, net churn goes negative and net revenue retention rises above 100%. That is the single figure most subscription investors ask about, because a business with negative net churn grows even in a quarter where it wins no new customers.

Churn only means something with a period attached, and rates don't scale linearly across periods. A 3% monthly churn is not 36% a year. Each month's losses come off a smaller base, so it compounds to about 30.6%. The tool converts between monthly and annual using the compound formula in both directions, and turns your rate into the average lifetime it implies: one divided by churn, in periods. At 3% a month that's about 33 months.