Ideal Weight Calculator
Calculate your ideal body weight range using four leading medical formulas — Devine, Robinson, Miller, and Hamwi.
Did this tool work for you?
How to use this calculator
Each formula gives a slightly different result. The range across all four shows the healthy window.
- 1
Enter your height in centimetres.
- 2
Select your biological sex.
- 3
The calculator shows your ideal weight range from four leading medical formulas.
Frequently asked questions
Is there one definitive "ideal weight"?
No. Different formulas give different results, and healthy weight varies by body composition, muscle mass, bone density, and age. The range across formulas is more useful than any single number.
What is the Devine formula?
The Devine formula (1974) was originally developed to estimate drug dosing for ideal body weight. For men: 50 kg + 2.3 kg per inch over 5 feet. For women: 45.5 kg + 2.3 kg per inch over 5 feet.
How does ideal weight differ from healthy BMI weight?
BMI-based healthy weight is a range (18.5–24.9 BMI). Ideal weight formulas give a single target. Ideal weight formulas tend to give lower targets than the upper end of the BMI healthy range.
Should I aim for the ideal weight target?
These formulas are guidelines, not prescriptions. Athletes and muscular individuals often exceed ideal weight while being very healthy. Body fat percentage and fitness are better health indicators than weight alone.
Ideal body weight formulas explained
The four main ideal weight formulas
Devine (1974): most widely used in medicine. Robinson (1983): derived from insurance and population data. Miller (1983): based on lean body mass estimates. Hamwi (1964): one of the oldest clinical formulas. All use height as the primary variable, with small adjustments for sex.
Limitations of ideal weight formulas
These formulas were developed decades ago from population studies. They do not account for muscle mass (athletes will appear "overweight"), bone density (larger frames carry more weight healthily), age, or ethnicity. They are screening tools, not diagnostic standards.
A more complete picture of healthy weight
Use ideal weight alongside BMI (18.5–24.9), waist circumference (men <94 cm, women <80 cm), body fat percentage, and physical fitness. No single metric captures health — the combination gives the clearest picture.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →