4.00% is the example result. Read it using the units and relationship stated below.
Monthly Churn Rate uses customers lost, customers at start.
Separating growth, retention and subscription capacity
For monthly churn rate, the relationship is Result = (([Customers lost]) ÷ ([Customers at start])) × 100. The amount depends on the supplied customers lost, customers at start, rather than a live market price or a value imported from another record. Recurring revenue should be compared across the same starting cohort. Expansion, contraction and churn change retention in different directions. Adding new customers to a retained-customer calculation can conceal losses in the original population.
What the model includes
Result = (([Customers lost]) ÷ ([Customers at start])) × 100 Match the unit of the plan: users, seats, subscriptions and revenue are not interchangeable. A purchased seat can remain unused even when the invoice is fully paid. Annual prepayment also changes cash timing without changing monthly recurring value. Read the result beside the renewal schedule and account concentration. A short measurement window may miss seasonal usage or contracts that have not yet reached their renewal date.
Example with the supplied inputs
Customers lost: 12; Customers at start: 300. Result: 4.00%. The values are illustrative.
Compare one changed input
Customers lost changes from 12 to 13.2. The result becomes 4.40%. All other inputs remain fixed.
Calculation rule
Result = (([Customers lost]) ÷ ([Customers at start])) × 100
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Customers lost | 12 | Use the source quantity represented by customers lost. Keep the counted population fixed and avoid mixing a unit value with a period total. |
| Customers at start | 300 | Use the source quantity represented by customers at start. Keep the counted population fixed and avoid mixing a unit value with a period total. |
Output: 4.00% is the example result. Read it using the units and relationship stated below. Use the formula to distinguish a cash amount, count, percentage or ratio.
How to use the page
Collect the inputs
Gather Customers lost, Customers at start. Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Customers lost on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 4.00%.
Change Customers lost from 12 to 13.2 while keeping every other value fixed. The result becomes 4.40%. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026