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Churn Rate Calculator

Churn, retention and the average customer lifetime it implies.

Business Calculators Free, no sign-up Runs in your browser

Optional. Gives net growth.

Optional. For revenue churn rather than customer churn.

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Churn rate
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Retention rate
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Average lifetime
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Annualised churn
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Net growth
MeasureValue
Churn and retention are two views of the same number, and both are usually quoted without the period. A 5% monthly churn is a 46% annual churn, which is a very different business from one losing 5% a year.

About the Churn Rate Calculator

Churn Rate Calculator works out the share of customers lost in a period, the retention rate that is its mirror image, and the average customer lifetime the rate implies. It also annualises the figure, which is where most churn conversations go wrong.

Annualising churn is not multiplying by twelve. Retention compounds: keeping 94 per cent of customers each month means keeping 0.94 to the twelfth power over a year, which is about 48 per cent, so annual churn is 52 per cent rather than 72. Quoting a monthly rate as though it were annual, or multiplying it up, both produce badly wrong numbers.

Average lifetime is the reciprocal of the churn rate, and it is the bridge to customer lifetime value. Six per cent monthly churn implies an average stay of about 17 months. Halving churn doubles that, which is why retention work usually beats acquisition work on the same budget.

This is arithmetic, not financial advice. It tells you what the numbers do; it cannot tell you whether a decision is right for your circumstances. Fees, taxes and local rules vary, so check anything that matters against the actual offer and speak to someone qualified before committing.

Everything is worked out inside your browser. Nothing you enter is uploaded, logged or stored, which matters for the financial calculators in particular: the figures you put into them are nobody else's business.

How to use the Churn Rate Calculator

  1. Choose periodThe fields below change to match what you pick, so only the figures that matter to your case are asked for.
  2. Enter customers at the start, customers lost in the period and customers gainedDecimals are fine, and thousands separators are accepted and ignored.
  3. Read the churn rate, retention rate and average lifetimeThe figures update as you type. The Calculate button is there if you would rather press something, but nothing waits for it.
  4. Copy or check the resultCopy the summary with the copy button, or open the table to check it row by row.

Features

  • Shows churn rate, retention rate, average lifetime, annualised churn and net growth together, so you are not running it twice
  • A results table you can read across
  • Updates as you type, with no button to press and no page reload
  • Copy the result in one click
  • Free, no sign-up, and it runs entirely in your browser

Who uses this tool

The churn rate calculator is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

  • Reporting monthly churn and retention
  • Annualising a monthly churn rate correctly
  • Deriving average customer lifetime for an LTV model
  • Comparing customer churn with revenue churn

Frequently asked questions

How do I annualise monthly churn?

Compound the retention rate: one minus (retention to the power twelve). Multiplying monthly churn by twelve overstates it badly at higher rates.

What is the difference between customer and revenue churn?

Customer churn counts accounts; revenue churn counts money. Losing small accounts and keeping large ones gives high customer churn and low revenue churn.

Should new customers be in the denominator?

No. Churn measures what happened to the customers you started with, so the denominator is the opening count. Including new arrivals flatters the rate.

If the churn rate calculator is not quite what you need, these other free tools solve closely related problems, and there are 19 more in business calculators.

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Checked and rebuilt on 2026-10-14. The method this calculator uses is described in the section above, and corrections go through the contact page.