Free Ideal Weight Calculator

Find your ideal body weight by height and gender using the Robinson, Miller, Devine & Hamwi formulas — plus your healthy weight range.

Instant Results

4 Proven Formulas

Completely Free

Gender

Unit System

Height (cm)

Ideal Weight Formulas

Formula	Men (per inch over 5 ft)	Women (per inch over 5 ft)
Robinson (1983)	52 kg + 1.9 kg	49 kg + 1.7 kg
Miller (1983)	56.2 kg + 1.41 kg	53.1 kg + 1.36 kg
Devine (1974)	50 kg + 2.3 kg	45.5 kg + 2.3 kg
Hamwi (1964)	48 kg + 2.7 kg	45.5 kg + 2.2 kg

Ideal body weight is a general guideline for healthy adults. It does not account for muscle mass, body frame, or athletic build. Consult a doctor for personalised advice.

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Frequently Asked Questions

Ideal body weight (IBW) is an estimate of a healthy weight for a person based on their height and gender. It is widely used in medicine for dosing and as a general health reference. Several formulas exist (Robinson, Miller, Devine, Hamwi), and this tool shows all of them plus an average.

The common formulas all start from a base weight at 5 feet (60 inches) of height and add a fixed amount per inch above that. For example, the Robinson formula for men is 52 kg + 1.9 kg for each inch over 5 feet; for women it is 49 kg + 1.7 kg per inch over 5 feet.

No single formula is perfect — each was developed for slightly different purposes. The Devine formula is the most widely used in clinical settings, while Robinson and Miller are refinements of it. This tool shows all four and an average so you can see a realistic range rather than one number.

The standard formulas use only height and gender, not age or frame size. Ideal weight is a general guideline. Factors like muscle mass, bone structure, and body composition mean a healthy weight can vary. Use it as a reference, not a strict target.

Ideal weight is a single target figure from a formula. A healthy weight range is the band of weights that gives a normal BMI (18.5 to 24.9) for your height. This tool shows both — the formula-based ideal weight and the BMI-based healthy range.

Yes, CodBolt's Ideal Weight Calculator is completely free with no signup, no ads, and no limits. All calculations run instantly in your browser and no data is stored.