Your ideal weight range using 4 medical formulas.
The Ideal Weight Calculator gives you a healthy weight range based on your height, age and gender using four established medical formulas: Hamwi, Devine, Robinson and Miller. No single formula is perfect — the range gives you a realistic target.
Pick your gender, type your height (cm or ft+inches), choose a body frame size if you know it (small / medium / large) and your age. The result panel shows four numbers — one from each named formula — plus the average. Frame size adjusts the average up or down by roughly 10% because skeletal width genuinely affects healthy weight at the same height. The healthy BMI range (18.5–24.9 BMI for your height) is shown alongside as a sanity check. Read the spread, not a single number; if your real weight is anywhere inside the four-formula range, you're at a clinically reasonable weight.
Hamwi (1964): men 48 kg + 2.7 kg per inch over 5 ft; women 45.5 kg + 2.2 kg per inch over 5 ft — quick clinical rule of thumb. Devine (1974): men 50 + 2.3 × inches over 5 ft; women 45.5 + 2.3 × inches over 5 ft — used for medication dosing in hospitals. Robinson (1983): men 52 + 1.9 × inches over 5 ft; women 49 + 1.7 × inches over 5 ft — slightly higher targets. Miller (1983): men 56.2 + 1.41 × inches over 5 ft; women 53.1 + 1.36 × inches over 5 ft — the highest. None apply below 5 ft so the calculator extrapolates carefully.
These formulas were derived in the 1960s–80s on mostly Western adult populations. They under-estimate healthy ranges for athletic builds and may overestimate for very small or very tall individuals. Pregnancy, recovery from illness, and disability all change what's healthy. The number is a starting point for conversation, never a target imposed on a body.