Churn Rate Calculator

Customer churn rate is the customers you lost during the period divided by the customers you had at the start, multiplied by 100. For example, losing 10 of 200 customers is a 5 percent churn rate. Retention is simply 100 minus the churn rate, so that example keeps 95 percent.

Customer churn counts how many accounts you lost, treating every customer equally. Revenue churn measures the MRR you lost, so losing one large account hurts more than losing one small one. A business can have low customer churn but high revenue churn if its biggest accounts leave, which is why it helps to track both.

Net revenue churn subtracts expansion revenue from upgrades and add-ons from the revenue you lost to cancellations and downgrades, divided by starting MRR. When expansion outpaces losses the figure goes below zero. That is called net negative churn, and it is a strong sign because your existing customers grow your revenue even before you add new ones.

Pick the period that matches how you bill and report, and stay consistent. Monthly churn suits fast-moving SaaS, while annual churn can read more clearly for contracts that renew once a year. Do not compare a monthly rate against an annual one directly, since a small monthly rate compounds into a much larger annual figure.

It varies widely by market and customer size. Many SaaS businesses aim for low single digit monthly customer churn, and the best products reach net negative revenue churn. Rather than chase one benchmark, compare against your own trend and watch whether churn rises or falls over time.

No. The calculation runs entirely in your browser, so your customer counts and MRR figures never leave your device or get stored on a server.