Ideal Weight Calculator — Find Your Healthy Weight Range

"What should I weigh?" is one of the most common health questions, and there's no single right answer — which is exactly why this ideal weight calculator shows you several. It runs four respected medical formulas — Hamwi, Devine, Robinson and Miller — each of which estimates a healthy weight from your height and sex, then gives you their average so you have one balanced figure to aim near rather than four competing ones.

These formulas were developed at different times and for different purposes; the Devine formula, for instance, began as a way to calculate medication doses. They use slightly different coefficients, so their results differ by a few kilograms, and the spread itself is informative — it shows that healthy weight is a band, not a precise point. Alongside the formulas, the tool calculates the weight range that corresponds to a normal BMI (18.5 to 24.9) for your height, giving you a sensible, evidence-based range to target.

Because the formulas rely only on height and sex, they can't see frame size, muscle mass or body composition. Someone with a larger frame or significant muscle may sit comfortably above their formula "ideal" while being perfectly healthy, and a very lean person may sit below it. The number is best used as a reference point, not a goal to hit exactly — pair it with body fat percentage and BMI for a rounder view.

As with all the health tools here, this is general educational information, not medical advice; your healthy weight is best confirmed with a qualified healthcare professional who knows your full history. The calculation runs privately in your browser, so your details never leave your device. Choose your units and enter your height above to see your range, then explore the BMI and body fat calculators.