Ideal body weight calculator
Compare Devine, Robinson, Miller and Hamwi weights with the healthy BMI range for your height.
A clear answer. Here’s how.
Four classic equations add a fixed weight per inch of height above 5 feet: Devine (50 kg men, 45.5 kg women, +2.3 kg per inch), Robinson (52 or 49 kg, +1.9 or 1.7), Miller (56.2 or 53.1, +1.41 or 1.36) and Hamwi (106 lb or 100 lb, +6 or +5 lb per inch). The healthy range shows the weights for BMI 18.5 up to 25. They were designed for drug dosing, not health targets, and apply from 5 to 8 feet.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Sex used by the equation
- Male
- Measurement units
- Metric (cm, kg)
- Height (cm, or inches)
- 180
Example result
- Devine (1974)
- 75.0 kg / 165.3 lb
- Robinson (1983)
- 72.6 kg / 160.2 lb
- Miller (1983)
- 71.5 kg / 157.7 lb
- Hamwi (1964)
- 77.7 kg / 171.2 lb
- Healthy BMI range (18.5 to under 25)
- 59.9 to 81.0 kg / 132.1 to 178.6 lb
Each formula adds a fixed amount of weight per inch above 5 feet; they were written for hospital drug dosing and give different answers, so treat them as a range. The BMI range uses the WHO adult normal band. None allow for frame size, muscle or age. Not medical advice.