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tool.bmi-calculator Calculator
Calculates Body Mass Index from height and weight and classifies the result against WHO categories (Underweight, Normal, Overweight, Obese). BMI is a population-level screening tool with well-documented limitations for individuals with high muscle mass.
Inputs
Wt
Body or object weight. For health calculators, usually in kg or lbs.
Ht
Vertical measurement. For health calculators, typically standing height without shoes.
Wrist
Reference formula or conversion factor shown for context.
Age
Age in completed years. Many health and fitness formulas adjust for age.
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.
frame size (wrist)
Reference formula or conversion factor shown for context.
ideal weight range
Estimated healthy weight for this height, using formulas like Devine or Robinson. Rough guide — healthy weight varies by body composition, frame size, and genetics.
weight to lose/gain
The computed weight (gravitational force) or mass.
BMI = kg/m²
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.