Four published formulas, side by side, plus the healthy BMI range for your height.
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These formulas take height and sex only. They cannot see frame size or muscle, which is why they disagree and why the range matters more than any single figure.
Ideal weight range
68.7 kg to 72 kg
The span across all four formulas
| Formula | Result |
|---|---|
| Devine | 70.5 kg |
| Robinson | 68.9 kg |
| Miller | 68.7 kg |
| Hamwi | 72 kg |
| Healthy BMI range | 56.7 kg to 76.3 kg |
The BMI band is usually the widest row, and the most honest. Bodies of the same height differ by that much while being equally healthy.
This tool shows four formulas at once, and they will not agree. That disagreement is the most useful thing on the page.
Devine, Robinson, Miller, and Hamwi were each derived for clinical purposes, mostly drug dosing rather than health targets. They take height and sex and nothing else, which means they have no way to account for frame size, muscle, or age. Treat the spread between them as the honest answer.
A healthy BMI of 18.5 to 24.9 converts to a weight range for your height, and that range is wide. For someone 175 centimetres tall it spans roughly 57 to 76 kilograms.
A nineteen kilogram window sounds imprecise, and that is the point. Bodies of the same height genuinely differ that much while being equally healthy.
Frame size is the big one. Wrist and elbow breadth vary enough between people of the same height to shift a sensible target by several kilograms, and no height-only formula captures it.
Muscle is the other. An athlete can sit well above every one of these numbers with low body fat and excellent health markers. If the figure you get looks wrong for how you actually look, the figure is probably what is wrong.
These formulas need nothing else, which is both their convenience and their limitation.
Four results appear. The span between the lowest and highest is a more honest target than any single figure.
The weight range for a BMI of 18.5 to 24.9 at your height is shown alongside, and it is usually wider.
Larger frame or serious muscle means a higher sensible target. Neither is in the equations.
Enter height and weight. The number appears as you type, and nothing leaves your browser.
The US Navy circumference method. All you need is a tape measure.
Estimates how many calories you burn in a day, and what to eat to hold, lose, or gain weight.
A calculator tells you where you are once. If the thing you actually want is to keep something up, that takes a record rather than a result.
