Churn Rate Calculator

Measure the share of customers lost during a period. Enter your own values below to see customer churn and check the method behind it.

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Your result

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Your result and breakdown will appear here.

How this calculator works

Customer churn = Customers lost during period ÷ Customers at start of period × 100.

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What is Churn Rate Calculator?

Churn Rate Calculator helps you measure the share of customers lost during a period.

The main result is customer churn. The formula, example and assumptions below explain how to interpret it.

How to use Churn Rate Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather customers lost during period and customers at start of period. Use values from the same situation or reporting period.
  2. Replace the example customers lost during period with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read customer churn. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter customers lost during period, at least 0. Decimals are accepted.
  • Enter customers at start of period, at least 0.000001. Decimals are accepted.

Churn Rate Calculator: a worked example

With the inputs below, the result is 20 % (customer churn). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Customers lost during period200
Customers at start of period1,000
Customer churn20 %

Understanding the Churn Rate result

The main output is customer churn, expressed in %. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Churn Rate Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Separate revenue from cash receipts and cost from selling price. Check the denominator before comparing a margin with a markup.

For wider guidance, visit ICAI. The formula and scope of this specific tool are stated on this page.

Churn Rate Calculator FAQs

What does Churn Rate Calculator calculate?

Churn Rate Calculator helps you measure the share of customers lost during a period. Its main output is customer churn in %.

What inputs do I need for Churn Rate Calculator?

You need customers lost during period and customers at start of period. Use the field labels and units to match your figures to the formula.

Which formula does Churn Rate Calculator use?

Customer churn = Customers lost during period ÷ Customers at start of period × 100.

What is a worked example for Churn Rate Calculator?

Example inputs: Customers lost during period: 200; Customers at start of period: 1,000. The result is 20 % (customer churn).

How should I enter customers lost during period?

Enter customers lost during period, at least 0. Decimals are accepted.

How do I choose customers at start of period?

Enter customers at start of period, at least 0.000001. Decimals are accepted. The example uses 1,000; replace it if your circumstances differ.

How should I read customer churn?

The main output is customer churn, expressed in %. It applies to the inputs and operation you selected.

Why might my Churn Rate Calculator result differ from my records?

Separate revenue from cash receipts and cost from selling price. Check the denominator before comparing a margin with a markup. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Churn Rate Calculator?

Yes. Note your first customer churn, change customers lost during period or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Churn Rate Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.