Body Mass Index
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Body Mass Index, where it falls on the healthy range, and your Ponderal Index as a bonus metric.
Beyond the BMI number and category, this shows exactly where you fall on the healthy range with a visual bar, the actual healthy weight range in pounds for your specific height, how far you are from that range if you're outside it, and your Ponderal Index — a related metric that scales height differently and is considered more reliable for people who are unusually tall or short.
BMI = weight(kg) ÷ height(m)² · Ponderal Index = weight(kg) ÷ height(m)³
No — BMI doesn't distinguish muscle from fat, so very muscular people often show as "overweight" despite low body fat, and older adults with reduced muscle mass can show a "normal" BMI while carrying more fat than the number suggests.
18.5–24.9 kg/m² is generally considered the healthy range for most adults, though it can vary by age, sex, and ethnicity.
It uses height cubed instead of squared, making it more consistent for people who are unusually tall or short — a useful cross-check alongside BMI.
No — children and teens need age- and sex-specific growth charts (BMI-for-age percentiles), not the adult categories used here.