Ideal Weight
WEBSee your ideal body weight range from your height and sex.
A healthy weight for your height sits between 53.5–72.3 kg (BMI 18.5–24.9). This is a general guide, not medical advice.
What is the Ideal Weight tool?
This ideal weight calculator estimates a healthy body weight for your height and sex, in metric or imperial units. It runs the four classic clinical formulas — Devine, Robinson, Miller and Hamwi — side by side, shows the average as a single headline figure, and adds the weight range that keeps your body mass index in the healthy 18.5 to 24.9 band. Seeing all four at once matters because they disagree by a few kilograms, and no single one is 'the' answer.
Each formula starts from a sex-specific base weight at five feet of height and adds a set amount for every inch above that, which is why taller people get a higher target and men a slightly higher one than women at the same height. The healthy range is calculated the other way round — from your height, it works out the lightest and heaviest weights that still land inside the normal BMI band, so you get a sensible window rather than one exact number to chase.
Your height and sex are processed entirely in your browser: nothing is uploaded, no account is needed, and once the page has loaded it even works offline. It is free with no limits and switches between kilograms/centimetres and pounds/feet-and-inches in one tap. One honest caveat — ideal body weight formulas are rough guides built for dosing and quick screening, not a diagnosis. They ignore muscle, frame size and body fat, so athletes and older adults especially should read the number in context and talk to a health professional about what a healthy weight means for them.
How to use the Ideal Weight
- Choose your sex — the formulas use a different base weight for men and women.
- Pick metric (cm) or imperial (feet and inches) units.
- Enter your height.
- Read your ideal weight — the averaged headline figure updates instantly.
- Compare the Devine, Robinson, Miller and Hamwi results and check the healthy BMI weight range below.
Frequently asked questions
What is ideal body weight?
Ideal body weight (IBW) is an estimate of a healthy weight for a given height, originally created to help calculate medication doses. This tool reports it four ways — Devine, Robinson, Miller and Hamwi — and averages them, then shows the weight range that keeps your BMI in the healthy 18.5 to 24.9 band.
How is ideal weight calculated?
Each formula takes a base weight at five feet of height (different for men and women) and adds a fixed amount per inch above that. For example, the Devine formula for men is 50 kg plus 2.3 kg for each inch over five feet. The calculator applies all four and converts the result to your chosen unit.
Why do the four formulas give different numbers?
They were published in different years using different data, so their base weights and per-inch amounts vary slightly. Devine (1974) tends to sit lowest, Hamwi (1964) highest. Looking at the spread — and the healthy BMI range — is more useful than fixating on any single value.
Is ideal weight different for men and women?
Yes. Each formula uses a lower base weight for women, so at the same height a woman's ideal weight comes out a little lower than a man's. That is why the calculator asks for your sex.
How accurate is an ideal weight calculator?
It is a rough guide, not a measurement. The formulas ignore muscle mass, frame size and body-fat percentage, so a muscular athlete can read as 'over' their ideal weight while carrying very little fat. Treat it as a starting point and discuss your real target with a health professional.
Is my data private?
Yes. Your height and sex are used only in your browser to do the maths — they are never uploaded, stored or sent to any server. After the page loads the calculator works offline.
Is this ideal weight calculator free?
Yes — free, with no sign-up, no account and no limits. Enter your height and see your ideal weight in seconds.