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health.bmi-advanced Calculator
Calculates BMI, BMI Prime (ratio to upper normal), and Ponderal Index (height-adjusted) for a more nuanced body composition picture. Ponderal Index (kg/m³) is superior to BMI for very tall or short individuals where BMI systematically miscategorises body composition.
Inputs
Weight
Body or object weight. For health calculators, usually in kg or lbs.
Height
Vertical measurement. For health calculators, typically standing height without shoes.
Age
Age in completed years. Many health and fitness formulas adjust for age.
Sex
Reference formula or conversion factor shown for context.
Results
BMI
BMI (body mass index) = weight (kg) / height squared (m^2). Under 18.5: underweight. 18.5-24.9: normal. 25-29.9: overweight. 30+: obese. Does not distinguish muscle from fat.
category
The classification bucket this result falls into based on the computed value and the applicable reference scale.
body fat % (est.)
The value at the specified point or condition.
ideal body weight (kg)
The computed weight (gravitational force) or mass.
weight to reach normal BMI
The computed weight (gravitational force) or mass.
BMI limitations
BMI (body mass index) = weight (kg) / height squared (m^2). Under 18.5: underweight. 18.5-24.9: normal. 25-29.9: overweight. 30+: obese. Does not distinguish muscle from fat.