Ideal Weight Calculator
Estimates from three well-known formulas, shown side by side since they don't always agree.
Why the three numbers differ
Devine, Robinson, and Hamwi are all decades-old formulas developed for different clinical purposes (originally for medication dosing), and none accounts for body frame or muscle mass — treat the spread between them as a rough range rather than a single target.
About the Ideal Weight Calculator
The Ideal Weight Calculator estimates a reference body weight for your height and sex using three well-known formulas: Devine, Robinson and Hamwi. These formulas were originally created for medication dosing and clinical use, and they give a range rather than one perfect number.
Each formula adds a fixed number of kilograms for every centimetre or inch above 152 cm (5 feet). They give slightly different results because they were derived from different data. They do not account for frame size, muscle mass, age or ethnicity, so they are rough guides. A healthy weight is better judged with BMI, waist measurements, fitness and medical advice.
How to use it
- Select male or female.
- Enter your height in centimetres.
- Read the three estimates.
- Consider the range and discuss goals with a health professional.
Tips and good to know
- Do not treat the number as a target if your body composition differs, for example in athletes.
- Compare with BMI for context.
- These formulas are intended for adults.
Frequently asked questions
Why are the three numbers different?
Each formula uses slightly different constants and was developed separately.
Is ideal weight the same as healthy weight?
Not necessarily; healthy weight depends on many factors.
Does age matter?
The formulas ignore age.