Ideal Weight Calculator
See what the four classic ideal-body-weight formulas — Devine, Robinson, Miller, and Hamwi — suggest for your height and sex, shown as a range rather than a single misleading number. Results in kg or lb to match your chosen units.
Ideal-weight range
Example: male at 175 cm → Devine 70.5 kg.
The four formulas, side by side
Each takes the form "base weight at 5 ft + increment per inch above". For a man at 175 cm the engine computes: Devine 70.5 kg, Robinson 68.9 kg, Miller 68.7 kg, Hamwi 72 kg — a spread of about 3.3 kg between the most and least generous. Presenting all four as a band is more honest than averaging them into false precision.
Why the concept persists
Ideal body weight remains genuinely useful where it started: standardizing drug doses and ventilator settings to height rather than to total weight. As a personal target it is much weaker — a healthy weight range for you depends on composition and health markers, which is why this page reports the formulas' outputs without endorsing any of them as a goal.
Frequently asked questions
Where do these formulas come from?
Hamwi (1964) and Devine (1974) were devised for drug-dosing estimates, and Robinson and Miller (both 1983) refined them against insurance height-weight tables. All four share the shape: a base weight at 5 feet plus an increment per inch above.
Why do the four formulas disagree?
They were fitted to different reference data with different aims. The spread between them — a few kilograms at most heights — is a useful reminder that "ideal weight" is a modeling convention, not a biological constant.
Is my healthiest weight inside this range?
Not necessarily. The formulas ignore body composition, frame size, age, and ethnicity. Health markers (blood pressure, lipids, fitness) matter far more than distance from a 1970s dosing formula; discuss weight goals with a healthcare professional.
Why is there no result below 5 feet?
The formulas are defined as a base value at 5 ft plus per-inch increments above it; below that height they extrapolate meaninglessly, so the calculator declines rather than fabricating a number.
Not medical advice: these are historical population formulas with real limitations. Consult a qualified healthcare professional about healthy weight goals. Data is processed locally in your browser and never transmitted. See the methodology page.