Business
Customer Retention Rate Calculator
Calculate customer retention rate from starting customers, ending customers, and new customers acquired.
- Free to use
- Runs in your browser
- Level B · Industry formula
- Last reviewed 2026-08-16
How to use this calculator
Enter the requested values and select Calculate. The result is computed locally in your browser using the formula shown on this page.
Understanding the result
Measure the percentage of starting customers retained through the end of a period.
Calculation method
Retention Rate = (Ending Customers − New Customers) ÷ Starting Customers × 100.
Calculator guide
About the Customer Retention Rate Calculator
Measure the percentage of starting customers retained through the end of a period.
What to keep in mind
- Use all customer counts from the same period.
- Starting customers must be greater than zero.
- Retention can be distorted if customer definitions change.
Formula & methodology
Retention Rate = (Ending Customers − New Customers) ÷ Starting Customers × 100
Review standard: Level B · Industry formula. How calculator reviews work.CalculateMeasure performs the arithmetic locally in your browser. The displayed result depends on the values and units you enter.
Frequently asked questions
What does this calculator calculate?
Measure the percentage of starting customers retained through the end of a period.
Can I use the result for an important decision?
Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.
Does CalculateMeasure store the values I enter?
This calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.