BMI Prime Calculator
Turn your BMI into BMI Prime, a ratio against the upper healthy BMI of 25.
Quick answer: enter your details below and click Calculate BMI Prime — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Enter your weight in kilograms.
- Enter your height in centimetres.
- Click Calculate BMI Prime.
About this tool
BMI Prime divides your BMI by 25, the top of the usual healthy range, so 1.0 marks that boundary in a single number. Below 1.0 sits under the boundary and above 1.0 sits over it. It is the same information as BMI in a different form, and it carries the same limits for very muscular or older adults.
Frequently asked questions
Why divide by 25?
25 is the top of the commonly used healthy BMI range, so dividing by it puts that boundary at exactly 1.0.
Does BMI Prime suit athletes?
No better than BMI does; muscle can push both figures up without extra body fat.