Ideal Weight Calculator
Calculate your ideal body weight using four classic clinical formulas (Devine, Robinson, Miller, Hamwi) shown side by side against the healthy BMI weight range, with a visual comparison of where each estimate falls.
Recommended range (healthy BMI 18.5–24.9)
56.7 kg — 76.3 kg
Formula average: 70.0 kg
Side-by-side comparison
Devine
70.5 kg
1974
Robinson
68.9 kg
1983
Miller
68.7 kg
1983
Hamwi
72.0 kg
1964
The four formulas
Ideal body weight (IBW) formulas were created for clinical dosing and quick reference, not aesthetics. Each is a simple linear function of height: a base weight at 5 ft (152 cm) plus a fixed amount per inch above it.
| Formula | Year | Men (kg) | Women (kg) |
|---|---|---|---|
| Hamwi | 1964 | 48 + 2.7·in | 45.5 + 2.2·in |
| Devine | 1974 | 50 + 2.3·in | 45.5 + 2.3·in |
| Robinson | 1983 | 52 + 1.9·in | 49 + 1.7·in |
| Miller | 1983 | 56.2 + 1.41·in | 53.1 + 1.36·in |
in = inches of height above 60 in (5 ft). Devine, originally devised for drug dosing, became the de-facto standard and is still the most widely cited.
IBW vs. healthy BMI range
The formulas return a single number; the healthy BMI band (18.5–24.9)returns a range of weights for your height. The range is the more modern, evidence-based target — the single-number formulas tend to fall near its lower-middle portion.
That is why this tool plots all four formula points on top of the green BMI zone: if every estimate sits inside the band, any weight in that band is reasonable. Treat IBW as a reference point, not a hard goal.
Limitations to know
- No body composition: formulas can't tell muscle from fat — a lean athlete often exceeds their "ideal" while being perfectly healthy.
- Height-only: they ignore frame size, age, and ethnicity, which all shift a realistic target.
- Extrapolation below 5 ft: all four were fitted around average adult heights and become less reliable at the extremes.
- Pair with other metrics: waist circumference and body-fat percentage describe health risk better than weight alone.
Frame size adjustment
A common clinical tweak: subtract about 10% for a small frame and add about 10%for a large frame. Estimate frame from wrist circumference relative to height — larger wrists generally mean a larger skeletal frame and a higher healthy weight.
This calculator is for general information only and is not a substitute for medical advice.