Health

Ideal Weight Calculator

How much should I weigh? This calculator computes your ideal body weight using four scientific formulas (Broca, Devine, Hamwi, Robinson) and shows your healthy weight range – based on your height and sex.

✓ Reviewed by Julian Bronski · updated June 2026

Your details

Height 175

100250+

Sex

Age (optional) 30

years

15100+

Result

Ideal weight Broca (kg)

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Ideal weight Devine (kg)

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Ideal weight Hamwi (kg)

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Ideal weight Robinson (kg)

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Healthy range min (kg)

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Healthy range max (kg)

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How does the Ideal Weight Calculator work?

Four established formulas are compared:

Broca (1871): Men = height (cm) − 100; Women = height (cm) − 105. Simple and widely known.
Devine (1974): Men = 50 + 2.3 × (inches over 5 ft); Women = 45.5 + 2.3 × (inches over 5 ft). From clinical pharmacology.
Hamwi (1964): Men = 48 kg + 2.7 kg per inch over 5 ft; Women = 45.5 kg + 2.2 kg per inch over 5 ft. Widely used in clinical settings.
Robinson (1983): Men = 52 + 1.9 × (inches over 5 ft); Women = 49 + 1.7 × (inches over 5 ft). A more modern clinical refinement.

The healthy range is formed from the minimum and maximum of all four formulas.

Frequently asked questions

Which formula is most accurate for ideal weight? ▾

No single formula fits everyone. Broca is the most well-known but can be less accurate for very short or very tall people. Devine and Hamwi were developed for clinical use and are generally more robust. It's best to use the range from all four formulas as your reference.

Is ideal weight the same as normal weight? ▾

Not exactly. Ideal weight describes a target body weight for optimal health, while normal weight typically refers to the BMI range of 18.5–24.9. Ideal weight usually falls toward the lower end of the normal weight range – but muscle mass, bone structure and age all play a big role.

Why do the formulas give different results? ▾

Each formula was developed in a different era and for different purposes. Broca (1871) was a simple clinical rule of thumb, while Hamwi (1964) and Devine (1974) were optimised for drug dosing calculations. The variation shows that 'ideal weight' is not an exact number – it's a range.

Not financial or medical advice. No warranty.

How does the Ideal Weight Calculator work?

Frequently asked questions

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