BMI Prime Calculator
Calculate your BMI Prime and Ponderal Index (Rohrer's Index) with adjustable standards and live sliders.
BMI Prime Visual Placement
BMI Prime Ranges (Western Standard)
About BMI Prime Calculator
BMI Prime is a dimensionless ratio of a person's BMI to the upper limit of the normal BMI range (typically 25 kg/m² for Western populations or 23 kg/m² for Asian populations). A BMI Prime of exactly 1.0 corresponds to a BMI at the healthy upper limit. Values below 1.0 are in the healthy range, and values above 1.0 indicate overweight.
This calculator allows toggling between Western and Asian standards, adjusting the denominator and categorization ranges automatically. The Ponderal Index (Rohrer's Index) is also calculated to help correct height bias in very tall or very short individuals. All calculations run strictly client-side.
Private & free — this tool runs entirely in your browser.