Ideal Weight Calculator

"Ideal body weight" is a single reference weight calculated from your height and sex. It's worth knowing where it comes from: the Devine formula was created in 1974 to standardise medication doses, not to define a personal health goal. It has stuck around because it's simple, but it's a heuristic, not a verdict.

The most important thing to understand is that a healthy weight is a range, not a point. Two people of the same height and sex can both be perfectly healthy at noticeably different weights, depending on their build and muscle. That's why we pair this with the Healthy Weight Range calculator, which gives a band rather than one number.

Because it uses only height and sex, this figure can't account for how much of your weight is muscle versus fat. If you train seriously, it may read low; a body-fat estimate will tell you far more than an 'ideal weight' number ever can.

Formula. We use the Devine equation. For men, ideal weight (kg) = 50 + 2.3 × (height in inches − 60); for women, 45.5 + 2.3 × (height in inches − 60). Height entered in cm is converted to inches first, and the result is shown in the weight unit that matches your region.

Alternatives. Robinson, Miller, and Hamwi formulas exist and give slightly different figures — there's no single agreed 'ideal', which is exactly why the result should be read as an approximation.

Confidence. We label this moderate confidence: it's a long-standing clinical heuristic, but it isn't a validated health-outcome target and ignores body composition. Use it alongside BMI, body fat %, and the healthy weight range rather than on its own.