Finding Your Ideal Weight: Multiple Scientific Approaches
Compare four validated formulas for calculating ideal body weight and understand why different methods may give different results based on your frame and build.
Why Multiple Formulas?
Different ideal weight formulas were developed for different purposes and populations. The Robinson, Miller, Devine, and Hamwi formulas each have strengths and limitations. Comparing results from multiple formulas provides a realistic weight range rather than a single target number.
The Robinson Formula (1983)
Developed for calculating drug dosages, the Robinson formula is: Men: 52 kg + 1.9 kg per inch over 5 feet. Women: 49 kg + 1.7 kg per inch over 5 feet. This formula tends to give slightly higher weights than older formulas.
The Miller Formula (1983)
Also developed in 1983, Miller's formula is: Men: 56.2 kg + 1.41 kg per inch over 5 feet. Women: 53.1 kg + 1.36 kg per inch over 5 feet. This formula typically produces results between Robinson and Devine formulas.
The Devine Formula (1974)
Created for medical dosage calculations, Devine's formula is: Men: 50 kg + 2.3 kg per inch over 5 feet. Women: 45.5 kg + 2.3 kg per inch over 5 feet. This is one of the most widely used formulas in medical settings.
The Hamwi Formula (1964)
One of the oldest formulas, Hamwi's method is: Men: 48 kg + 2.7 kg per inch over 5 feet. Women: 45.5 kg + 2.2 kg per inch over 5 feet. You can adjust ±10% for large or small body frames. This formula is simple and still commonly used.
Interpreting the Results
Use these formulas as guidelines, not absolute targets. Your ideal weight depends on body composition, frame size, muscle mass, and overall health. If the formulas give a range of 150-165 pounds, any weight in that range could be healthy for you. Focus on how you feel and your health markers, not just the number on the scale.