Four formulas, one answer
Each formula starts from a weight at 5 feet and adds a fixed amount per inch above it. The headline is their average; the healthy BMI range is a wider, more forgiving target.
| Formula | Men | Women |
|---|---|---|
| Devine | 50 kg + 2.3 kg/in | 45.5 kg + 2.3 kg/in |
| Robinson | 52 kg + 1.9 kg/in | 49 kg + 1.7 kg/in |
| Miller | 56.2 kg + 1.41 kg/in | 53.1 kg + 1.36 kg/in |
| Hamwi | 48 kg + 2.7 kg/in | 45.5 kg + 2.2 kg/in |
Common questions
Which of the four formulas is most accurate?
None is definitively "right" — they're all decades-old clinical estimates (Devine is the most widely used, mainly for drug-dosing calculations), which is why the calculator averages all four rather than picking a winner.
What if I'm under 5 feet tall?
The formulas still work — the "inches over 5 ft" term just goes negative, pulling the estimate below each formula's base weight. It's less tested at that end of the height range, though.
For general information only — not medical advice. Talk to a doctor about anything that concerns you.