🎯 Ideal Weight Calculator

Your healthy weight range from height — four established formulas compared

cm

Ideal Weight Estimates

Healthy BMI Range (18.5–24.9)—
Devine Formula—
Robinson Formula—
Hamwi Formula—
⚠️ "Ideal weight" formulas are population averages — they don't account for muscle mass, frame size or ethnicity. The healthy BMI range is the most clinically used guide. Consult your GP for personalised advice.

What is an Ideal Weight?

There's no single "ideal" weight — formulas give estimates based on height and gender. The most clinically meaningful measure is the healthy BMI range (18.5–24.9), which defines a weight band rather than a single number.

The Formulas Explained

Devine (1974): originally developed for drug dosing — men: 50kg + 2.3kg per inch over 5ft; women: 45.5kg + 2.3kg/inch. Robinson (1983) and Hamwi (1964) are similar refinements. All were developed on limited populations and should be treated as rough guides only.

Better Measures Than Weight Alone

Waist circumference is a strong indicator of health risk: the NHS suggests increased risk above 94cm (men) / 80cm (women) and high risk above 102cm / 88cm. Waist-to-height ratio (keep your waist below half your height) is increasingly used as a simple check.