Ideal Weight Calculator

The Ideal Weight Calculator estimates a healthy body weight range from your height and gender using four formulas developed by different researchers between 1964 and 1983: Devine, Robinson, Miller and Hamwi. Rather than picking one formula and presenting it as definitive, this tool shows all four side by side along with their average — since the formulas disagree with each other by a few kilograms, seeing the spread gives a more honest picture than a single number pretending to be precise.

All four formulas share the same basic shape: a base weight for someone exactly 5 feet tall, plus a fixed amount added for every inch taller than that. They differ only in the base weight and the per-inch coefficient, which is why they produce similar but not identical results — the Devine formula (originally created for medical drug dosing, not fitness) tends to sit in the middle of the four, while Miller's tends to run a little higher.

These formulas were derived from population averages decades ago and don't account for muscle mass, bone density, frame size or body composition — a muscular athlete can be well above every one of these numbers while being perfectly healthy, and someone with a naturally small frame might be healthy somewhat below them. They're a rough population-level estimate, not a personalized medical target.

Switch between centimeters and inches for height entry, and everything computes instantly in your browser. This tool is for general information only, not medical advice — talk to a doctor or dietitian for weight guidance tailored to your body, health history and goals. It pairs naturally with the BMI Calculator and Calorie Calculator on this site: BMI flags a range from height and weight alone, this tool estimates a target weight from height alone, and the calorie calculator estimates the daily intake needed to move toward or maintain it.