Ideal Weight Calculator
Estimate your ideal body weight from your height and sex using the Devine, Robinson, Miller and Hamwi formulas, plus a healthy weight range based on BMI.
For general information only — not medical advice. “Ideal weight” formulas are rough, decades-old estimates based mainly on height and sex; they ignore body composition and frame. A healthy weight is individual — discuss it with your doctor.
What “ideal weight” means
The classic ideal-weight formulas estimate a target from your height and sex. The Devine formula, for instance, starts at 50 kg (men) or 45.5 kg (women) for a 5-foot frame and adds about 2.3 kg per inch above that. The calculator shows the Devine, Robinson, Miller and Hamwi results side by side, plus a healthy weight range from BMI (18.5–24.9) for your height.
Why the BMI range is often better
The formulas were built decades ago from height and sex alone, so they ignore muscle and frame size and disagree by a few pounds. The BMI-based range is broader and more widely accepted as a healthy target. Treat any single number as a rough guide, not a goal in itself. For related checks, see the BMI calculator and the body fat calculator.
Frequently asked questions
How is ideal body weight calculated?
The classic formulas base it on height above 5 feet. The Devine formula, for example, is 50 kg (men) or 45.5 kg (women) plus 2.3 kg for each inch over 5 feet. This calculator shows the Devine, Robinson, Miller and Hamwi results plus a healthy weight range from BMI.
What is a healthy weight for my height?
A widely used guide is the weight range that puts your BMI between 18.5 and 24.9 for your height — the calculator shows this range alongside the formula estimates. It is broader and more accepted than a single “ideal” number.
Why do the formulas give different numbers?
The Devine, Robinson, Miller and Hamwi formulas were developed separately and use slightly different constants, so they disagree by a few pounds. None accounts for muscle or frame size, which is why the BMI-based healthy range is often the more useful guide.