Find the healthy weight range for your height and body frame, compare four classic formulas with the healthy BMI band, and see how far your current weight is from that range.
Advanced: set your body frame manually
| Method | Weight | Notes |
|---|---|---|
| Devine | - | Common clinical formula; widely used for dosing. |
| Robinson | - | 1983 revision; usually reads a little lower. |
| Miller | - | 1983 revision; the most lenient of the four. |
| Hamwi | - | 1964 rule of thumb; reacts most strongly to height. |
| Healthy BMI range | - | Weight for a body mass index of 18.5 to 24.9. |
Body frame is estimated from the ratio of height to wrist circumference. A larger skeleton carries more healthy weight, so the range shifts up or down by about 10 percent.
How to read this result
To get a result, choose a starting preset or enter your own values: sex, height, current weight and wrist circumference. Use the unit toggle to switch between metric (cm, kg) and imperial (ft/in, lb). The advanced section lets you override the body frame instead of estimating it from the wrist.
The four formulas
The calculator shows a recommended weight from four classic equations, where height over 5 feet is measured in inches.
- Devine: men 50 kg plus 2.3 kg per inch over 5 feet; women 45.5 kg plus 2.3 kg per inch.
- Robinson: men 52 kg plus 1.9 kg per inch; women 49 kg plus 1.7 kg per inch.
- Miller: men 56.2 kg plus 1.41 kg per inch; women 53.1 kg plus 1.36 kg per inch.
- Hamwi: men 48 kg plus 2.7 kg per inch; women 45.5 kg plus 2.2 kg per inch.
BMI range and body frame
Alongside the formulas the calculator works out the weight that gives a body mass index of 18.5 to 24.9 for your height, which is the standard healthy band. Body frame is estimated from the ratio of height to wrist circumference and classed as small, medium or large; a small frame lowers the formula weight by about 10 percent and a large frame raises it by the same amount. The headline range runs from the lowest to the highest of all these values, so no healthy weight is left out.
Distance to the range
If your current weight sits outside the band, the calculator shows how many kilograms or pounds you would need to lose or gain to reach it, plus a rough timeline based on a safe pace of about half a kilogram per week.
What is not included
This estimate does not account for muscle mass, athletic build, age, exact body composition or medical conditions, and it does not apply to children or to pregnancy. The formulas were built from adult population data and read low for very tall people and for athletes. It is not medical or nutrition advice; a healthy weight goal should be set with a qualified professional.