Find your ideal body weight using four clinically validated formulas. Compare results by gender, height, and age.
Devine: 50 + 2.3(inches over 5ft) [M] / 45.5 + 2.3(inches over 5ft) [F]The Devine formula estimates ideal body weight based on height and gender. It was developed in 1974 by Dr. B.J. Devine for medication dosing and is the most widely used formula in clinical settings. The result is also compared against the WHO healthy BMI range (18.5–24.9) for a complete picture.
| Symbol | Meaning |
|---|---|
| Devine | The clinical standard formula for ideal body weight, used for medication dosing |
Our calculations are based on established financial and scientific formulas. The following sources inform the default values and methodology used in this calculator:
Health professionals use BMI-based healthy weight ranges rather than a single ideal number, because body composition varies. A healthy BMI is 18.5-24.9. For any height, the healthy range is the weight that stays inside this BMI band. Frame size, muscle mass, and age mean two people of the same height can have different healthy weights, so treat the range as a general target. The four common formulas — Devine, Robinson, Miller, and Hamwi — give different ideal figures; for a 5-foot-6 woman they range from about 120 to 133 pounds, which is why a range beats a single number. Interpretation matters: the band assumes average muscle and frame, so a trained bodybuilder may exceed it while staying lean, and an older adult losing muscle may feel best near the bottom. Treat the midpoint as a soft target, weigh yourself at the same time weekly rather than daily, and judge progress mainly by how you feel and perform.
| Height | Healthy Weight Range (BMI 18.5-24.9) |
|---|---|
| 5 ft 0 in (152 cm) | 95-128 lbs |
| 5 ft 6 in (168 cm) | 115-154 lbs |
| 5 ft 10 in (178 cm) | 129-174 lbs |
| 6 ft 0 in (183 cm) | 136-184 lbs |
| 6 ft 3 in (190 cm) | 147-198 lbs |
One common way to define a healthy weight range is to invert the BMI formula. BMI = weight (kg) ÷ height (m)², and the widely used healthy band is 18.5 to 25. Flip the algebra and you get: healthy weight = BMI × height². That single equation is why every ideal-weight table shows a range rather than one number — your height fixes a window of about 20 kilograms (45 lb), and any point inside it is equally "healthy" by this measure.
| Height | Lower Bound (BMI 18.5) | Upper Bound (BMI 25) |
|---|---|---|
| 5'2" (158 cm) | 46 kg (102 lb) | 63 kg (138 lb) |
| 5'6" (168 cm) | 52 kg (115 lb) | 71 kg (156 lb) |
| 5'9" (175 cm) | 57 kg (126 lb) | 77 kg (169 lb) |
| 6'0" (183 cm) | 62 kg (137 lb) | 84 kg (185 lb) |
| 6'3" (191 cm) | 68 kg (149 lb) | 91 kg (201 lb) |
The BMI method is blunt on purpose. It cannot see muscle mass, so athletes often land in the "overweight" band at perfectly healthy body fat levels; and it can miss central adiposity, where weight looks normal but waist circumference flags risk. Treat the range as a starting reference, not a target to hit exactly — and if your weight sits inside it and your waist measurement is proportionate, further precision adds little. The calculator above combines the BMI approach with frame-size adjustments so you can see how the answer moves between methods.
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