Definition · Updated June 2026

What is Churn Rate? Plain-English 2026 answer.

Churn rate is the metric subscription businesses live and die by. Here is the plain-English definition, the formula, a worked example, and the traps to avoid.

Short answer

Churn rate is the percentage of customers (or revenue) that a business loses over a given period. It is the inverse of retention and the single clearest signal of whether a subscription business is leaking.

Definition

Churn rate measures how much you are losing. Customer (or logo) churn counts the customers who left; revenue churn measures the dollars that left. A 5 percent monthly customer churn rate means 5 of every 100 customers you started the month with are gone by the end of it. Because losses compound, small differences in churn produce enormous differences in growth over a year.

How it is calculated

Customer Churn Rate = (Customers lost during period / Customers at start of period) x 100

If you start the month with 400 customers and 12 cancel, your monthly churn rate is (12 / 400) x 100 = 3 percent. Annualized, roughly 30 percent of your base would turn over, which is the number that should drive your retention budget.

Why it matters

Churn is the leak in the bucket. You can pour leads in the top, but if churn is high, growth stalls and acquisition spend is wasted. It directly drives net revenue retention and customer lifetime value, and it is usually cheaper to cut churn than to add new customers. A modern team uses AI to spot at-risk accounts early; the AI toolkit for finance leaders covers the reporting side.

What to watch out for

Customer churn vs revenue churn. Losing many small accounts looks bad in logo churn but may barely dent revenue, and vice versa. Track both.
The denominator. Churn over a month, quarter, and year are very different numbers. Always state the period.
Gross vs net. Net revenue churn can be negative (good) if expansion outweighs losses. Do not confuse it with gross churn.
Cohort effects. Blended churn hides whether new cohorts churn faster or slower than old ones.

Frequently asked questions

How do you calculate churn rate?

Divide the customers lost during a period by the customers you had at the start, then multiply by 100. For revenue churn, use lost MRR over starting MRR instead.

What is a good churn rate?

It varies by model. For B2B SaaS, monthly logo churn under about 1 to 2 percent is healthy; consumer products run higher. Lower is better, and negative net revenue churn is the gold standard.

What is the difference between churn rate and revenue churn?

Churn rate (logo churn) counts customers lost. Revenue churn measures dollars lost. A few small cancellations can be low revenue churn but high logo churn.