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A classic ideal-weight estimate (Devine formula) with a healthy range around it.
Devine: men 50 kg + 2.3 kg/inch over 5 ft · women 45.5 kg + 2.3 kg/inch
It is a classic medical rule of thumb for an 'ideal' body weight based only on height and sex. It starts from a base weight at 5 feet tall — 50 kg for men, 45.5 kg for women — and adds 2.3 kg for every inch above that. It was originally created to help with medication dosing, not as a beauty or fitness target.
The formula gives one tidy figure, but no single weight is right for everyone of a given height — frame size, muscle, and build all vary. Showing a band around the Devine point is a more honest picture of what a healthy weight can look like, rather than implying there is one exact correct number.
The shaded band is the healthy range around the Devine estimate, with the formula's exact figure marked inside it. If you enter your current weight, a marker shows where you sit — inside the band, below it, or above it — so the comparison is visual rather than just a number.
Not exactly. 'Ideal weight' formulas are simple estimates and can disagree with each other and with BMI. A muscular person may weigh more than the formula suggests while being perfectly healthy. Use it as one rough reference point, alongside BMI and, most importantly, advice from a health professional who knows your full situation.
The Devine formula is still widely used in medicine to scale drug doses to body size, and as a quick reference in fitness and nutrition. For example, a man 5 ft 10 in tall has a Devine ideal near 73 kg; a woman of the same height near 68 kg. Treat these as starting points for a conversation, not fixed goals.