Churn Rate Calculator

Calculate customer churn and retention over a period from the starting count and customers lost, with the implied average customer lifetime. Calculates in your browser.

Churn rate

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Retention rate-
Avg customer lifetime-

Show the math

Churn is the share lost over the period; lifetime is the inverse of churn:

churn % = lost ÷ starting customers × 100

lifetime = 1 ÷ churn rate (periods)

If your period is monthly, the lifetime is in months. Annual churn behaves differently, keep periods consistent. All math runs in your browser.

What this does

A churn rate calculator finds customer churn and retention over a period from the starting count and customers lost, with the implied average customer lifetime.

How to use it

  1. Enter the starting customers.
  2. Enter the customers lost.
  3. Read the churn rate.
  4. See the average lifetime.

How it works

Retention is 100% minus churn. The average lifetime is expressed in the same period you measured.

churn = lost ÷ start × 100; lifetime = 1 ÷ churn

Understanding your result

The churn rate is the share of customers lost in the period, and its inverse is the average customer lifetime. Because churn compounds, even a few percent a month adds up to heavy annual loss. Retention is 100 percent minus churn, and small improvements there extend lifetime sharply.

Example

Losing 5 of 100 customers a month is 5% churn and a 20-month lifetime.

Sources & methodology

Last updated .

Frequently asked questions

How is churn rate calculated?

Divide the customers lost in the period by the number at the start, then multiply by 100.

How does churn relate to lifetime?

Average customer lifetime is one divided by the churn rate, expressed in the same period you measured.

Is my data stored?

No. Everything is calculated locally in your browser.