Body Composition Calculators
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BMI Calculator
Body mass index with the healthy weight range for your height, the lower Asian thresholds, and the height bias built into the…
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BMI Prime Calculator
BMI as a fraction of the healthy upper limit, so 1.0 is the edge — a rescaling that adds legibility and, deliberately,…
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Body Fat Calculator
Body fat from tape measurements, with how much a centimetre of waist error moves the answer — usually more than a fortnight…
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Body Surface Area Calculator
Body surface area by four formulas, with the scaling test that separates the two that are dimensionally exact from the two that…
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Ideal Weight Calculator
Four ideal weight formulas side by side, what each was actually built for, and the healthy BMI range — the only one…
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Lean Body Mass Calculator
Lean mass from body fat or from height and weight — with the James formula refused past the point where it reports…
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Understanding BMI: Formula, Categories and Limits
How body mass index is calculated in metric and imperial units, what the adult categories mean, the lower thresholds for Asian populations,…
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Waist to Height Ratio Calculator
Keep your waist under half your height. One threshold for everyone — no sex adjustment, no population table, no percentile chart.
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Waist to Hip Ratio Calculator
Waist divided by hips against the WHO thresholds, plus waist-to-height — because a ratio of two girths cannot see how big you…