What this calculator does
Customer churn & retention rate works out share of customers lost over a period, and the flip side: how many you kept. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
The inputs explained
| Field | What to enter |
|---|---|
| Customers at start of period | A number. Starts at 2000. |
| Customers lost during period | A number. Starts at 140. |
| New customers gained | A number. Starts at 180. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with customers at start of period
Every other input is held at the calculator’s starting values while customers at start of period varies. Select any row to load that scenario into the calculator.