Ideal Weight Calculator
Find your ideal body weight by height and sex, with a healthy weight range.
Metric (cm)Imperial (ft/in)
MaleFemale
Devine formula
70.5 kg (155 lb)
Robinson formula
68.9 kg (152 lb)
Miller formula
68.7 kg (152 lb)
Healthy range (BMI 18.5–24.9)
56.7 kg (125 lb) – 76.3 kg (168 lb)
The Devine, Robinson and Miller formulas estimate ideal body weight from height and sex; the healthy range comes from a BMI of 18.5–24.9. These are general references and do not account for frame size or muscle mass.
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Ideal Weight Formulas
Each formula starts from a base weight at 5 ft (60 in) and adds weight per inch above that:
| Formula | Men | Women |
|---|---|---|
| Devine (1974) | 50 kg + 2.3 kg/in over 5 ft | 45.5 kg + 2.3 kg/in over 5 ft |
| Robinson (1983) | 52 kg + 1.9 kg/in over 5 ft | 49 kg + 1.7 kg/in over 5 ft |
| Miller (1983) | 56.2 kg + 1.41 kg/in over 5 ft | 53.1 kg + 1.36 kg/in over 5 ft |
The healthy weight range uses BMI: weight = 18.5–24.9 × height(m)².
These are general references and do not account for muscle mass, frame size or body composition. For personalised targets, speak to a healthcare professional.
Frequently Asked Questions
- What is ideal body weight?
- Ideal body weight (IBW) is a reference weight for a given height and sex, originally developed for medication dosing. Several formulas exist, so this tool shows the Devine, Robinson and Miller results side by side, in both kilograms and pounds.
- Which ideal weight formula is best?
- There is no single best formula. Devine is the most widely used in medicine; Robinson and Miller give slightly different values. A healthy weight is best viewed as a range rather than one exact number.
- How is the healthy weight range calculated?
- It uses a BMI of 18.5–24.9 multiplied by your height in metres squared. At 175 cm (5′9″) the healthy range is roughly 57–76 kg, or about 125–168 lb.
- Do these formulas account for muscle or frame size?
- No. They are based only on height and sex, so very muscular or large-framed people may weigh more while still being healthy. Consider your body fat percentage and waist measurement as well.
- Why do the formulas only use height above 5 feet?
- Devine, Robinson and Miller all start from a base weight at 5 feet (60 inches) and add a set amount per inch above that, which is why height is the main driver of the result.
📅 Last updated: June 2026 · Formulas follow standard banking / tax conventions · Results are for reference only.