Free Online Ideal Body Weight Calculator

Calculate your scientifically suggested weight range using established medical formulas including Miller, Hamwi, Devine, and Robinson.

Calculator Settings

170 cm
cm

Results update in real-time as you adjust your height and preferences.

Devine Formula

Standard
-- kg

Most commonly used formula in clinical settings for drug dosage calculation.

Robinson Formula

1983 Revision
-- kg

Modified Devine formula aimed at improved accuracy for average-height users.

Miller Formula

1983 Statistical
-- kg

Uses a different base weight and increment, often resulting in slightly higher results.

Hamwi Formula

Original 1964
-- kg

The oldest of the four, originally designed for easy manual calculation.

Combined IBW Range

Lowest Estimate --
Highest Estimate --

Understanding IBW Formulas

The Devine Equation

Developed in 1974 by Dr. Ben J. Devine, this is the most widely recognized formula in medicine. It is primarily used to calculate dosages for specific medications like theophylline or digoxin, which distribute poorly in body fat.

The Robinson Equation

A revision of the Devine formula published in 1983. Robinson noted that the Devine formula didn't perfectly match the heights of modern populations and adjusted the values to provide a more accurate statistical average.

The Miller Equation

Also published in 1983, the Miller formula was based on different clinical data than Robinson. It often suggests a slightly higher ideal weight for the same height compared to the other three major formulas.

The Hamwi Equation

The G.J. Hamwi formula (1964) is intended for use with individuals of "medium frame." It is the simplest to remember: 100/106 lbs for the first 5 feet, plus 5/6 lbs for every additional inch.

Important Medical Disclaimer

Ideal Body Weight (IBW) is a clinical guideline used primarily by medical professionals to determine medication dosages and fluid requirements. It does not account for muscle mass, bone density, or overall body composition. These calculations are for educational and informational purposes only and should not replace professional medical advice from a qualified healthcare provider.