Compare the four published ideal-weight formulas — Devine, Hamwi, Robinson and Miller — side by side at any height, with the BMI 18.5–24.9 range alongside. Runs entirely in your browser — your numbers never leave this device.
| Formula | Result (kg) | Result (lb) |
|---|---|---|
| Devine | 73 | 160.94 |
| Hamwi | 75 | 165.35 |
| Robinson | 71 | 156.53 |
| Miller | 70.3 | 154.98 |
| BMI 18.5–24.9 range at this height | 58.5 – 78.7 kg | 128.9 – 173.5 lb |
The four formulas were published for different purposes — drug dosing, actuarial tables and similar — and they disagree with each other. The spread between them is information, not error.
Informational only. This calculator applies a published formula to the numbers you enter — it is not medical advice, a diagnosis, or a substitute for a clinician. Talk to a qualified professional about decisions concerning your health.
| Formula | Men: base + per inch | Women: base + per inch |
|---|---|---|
| Devine | 50 kg + 2.3 kg | 45.5 kg + 2.3 kg |
| Hamwi | 48 kg + 2.7 kg | 45.5 kg + 2.2 kg |
| Robinson | 52 kg + 1.9 kg | 49 kg + 1.7 kg |
| Miller | 56.2 kg + 1.41 kg | 53.1 kg + 1.36 kg |
"Ideal weight" is the historical name attached to a family of formulas developed for drug dosing and actuarial work, not a description of any person. Each formula starts from a base weight at 5 feet tall and adds a fixed amount for every inch above that height. Devine (1974) is the form most often used in clinical dosing references; Hamwi, Robinson and Miller are the other widely published variants, and their constants differ, which is why the four return four different numbers for the same height.
Because the formulas disagree, this page shows all four together rather than selecting one. Alongside them it shows the weight range that corresponds to BMI 18.5–24.9 at the same height, calculated from the WHO BMI definition. The range is wider than any single formula figure, which is the honest picture: published formulas produce estimates from height alone, and no single figure is a target for a person.
The output is informational arithmetic from named published formulas. It is not an assessment of any individual and it is not advice.
Each was fitted at a different time for a different purpose — dosing and actuarial tables — with different base weights and per-inch additions. The constants are printed in the table so the differences can be traced to the formulas themselves.
It is the historical name of the formulas, dating from their use in drug-dosing and insurance tables. On this page it names a set of calculations from height; it is not a judgement about any person.
For scale. The weight range corresponding to BMI 18.5–24.9 at the same height is calculated from the WHO BMI definition and is considerably wider than the spread between the four formula figures, which puts any single figure in context.
No. The page returns the outputs of published formulas for information only. It does not set a target for any person, and health decisions belong with a clinician.
No. The calculation runs entirely in the browser and nothing entered is uploaded, stored or tracked.
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