About

Determining an "ideal" weight is complex because different standards exist for medical health versus aesthetic goals. This calculator aggregates the five most respected algorithms used in clinical settings. While BMI (Body Mass Index) offers a broad range (18.5-25) for general health, formulas like Devine and Robinson were developed to calculate drug dosages based on lean body mass, making them more precise for individuals with average muscle composition.

Users often find that the Miller formula estimates lower weights, suitable for lighter frames, while the Hamwi method is a favorite among dietitians for quick frame-adjusted estimates. This tool runs all calculations simultaneously to provide a comprehensive "Agreement Range," helping you filter out outliers and find a realistic target.

Formulas

Devine Formula (Men):

Weight = 50 + 2.3 × (height_in_inches − 60)

Devine Formula (Women):

Weight = 45.5 + 2.3 × (height_in_inches − 60)

Other formulas follow similar linear regression logic with slightly different base constants and coefficients per inch over 5 feet.

Reference Data

Formula	Origin/Year	Primary Use Case
Robinson	1983	Replaced Devine; used for general population stats.
Miller	1983	Often yields lower estimates; good for slender frames.
Devine	1974	Originally for Levothyroxine dosing; standard for height.
Hamwi	1964	"Rule of Thumb" used in clinical dietetics.
BMI Range	WHO	Epidemiological health risk assessment (18.5-25).

Frequently Asked Questions

Each formula was derived from different population datasets at different times. The Miller formula (1983) often suggests lighter weights, while Devine (1974) is heavier. The variation reflects the natural diversity in human body types. An average of these numbers is usually the best starting point.

Yes. These formulas assume an average body composition. If you are a bodybuilder or powerlifter, you will likely weigh significantly more than the "Ideal Weight" due to muscle density, yet still be healthy. In such cases, use the Body Composition Calculator instead.

The Medical Healthy Range is strictly defined by the World Health Organization (WHO) as a BMI between 18.5 and 25. Falling within this range correlates with the lowest risk of all-cause mortality, regardless of what the aesthetic formulas suggest.