Ideal Weight Calculator

Calculate your ideal body weight using four scientific formulas. See your healthy weight range based on BMI and height.

This calculator runs four classic ideal-body-weight formulas — Robinson, Miller, Devine, and Hamwi — and averages them, alongside a healthy-range band derived from BMI. All four share the same structure: a sex-specific base weight at five feet tall, plus a fixed number of kilograms for every inch above sixty inches (heights below five feet are clamped to the base, so the formulas never subtract). They differ in slope: Hamwi adds the most per inch for men (2.7 kg) and Devine the most for women (2.3 kg), while Miller climbs the gentlest for both — so the four estimates fan out as height increases and nearly converge near five feet. Height is the input that matters within a sex: each added inch moves every formula by its slope, while switching sex shifts the whole bundle down by a roughly constant offset. The BMI range works differently — it is height squared times 18.5 and 24.9 — so it widens faster than the formula estimates as you get taller, which is why tall users see the average ideal sitting low inside the band. Results are reported in pounds. These formulas date to drug-dosing research, not body composition: they account for no muscle mass, frame size, or age.