Calculate your ideal body weight using four evidence-based formulas (Devine, Robinson, Miller, Hamwi). Supports metric and imperial units with healthy weight range.
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Devine: IBW = 50 + 2.3 × (height_in − 60) [male] | 45.5 + 2.3 × (height_in − 60) [female]IBWIdeal Body Weight in kgheight_inHeight in inches (converted internally from cm if needed)50 / 45.5Base weight for 5 ft (60 inches) — male / female2.3kg added per inch above 5 ftFour medical formulas are used in clinical practice to estimate ideal body weight. Devine (1974) is the oldest and most widely used. Robinson (1983), Miller (1983), and Hamwi (1964) are alternatives with slightly different baselines. The BMI range (18.5–24.9 kg/m²) provides an additional reference. No single formula is perfect for everyone — use the average as a guide.
Ideal body weight (IBW) has been used in medicine for decades — primarily for calculating drug doses, ventilator settings, and nutritional targets. This calculator applies the four most widely referenced clinical formulas (Devine, Robinson, Miller, and Hamwi) alongside the BMI healthy weight range, giving you a comprehensive picture of what a healthy weight looks like for your height and sex.
Select your unit system and biological sex, enter your height, and the calculator instantly applies all four formulas. Results are shown individually so you can see the range, plus an average and the BMI-based healthy weight range for comparison.
Seeing four formulas side-by-side shows that 'ideal weight' is a range, not a single number — typically spanning 3–6 kg between the lowest and highest formula. This is useful context: if you are within that range, you are doing well regardless of which formula you use as a reference.
A common mistake is treating the ideal weight as a hard target. These formulas ignore muscle mass, bone density, age, and ethnicity. A bodybuilder and a sedentary person of the same height will have very different ideal weights in practice. Use this as a starting reference, not a strict goal.
Calculate your Body Mass Index (BMI) using metric or imperial units. Understand your weight category and health implications.
Estimate body fat percentage using the US Navy method with waist, neck, and hip measurements. More accurate than BMI for body composition.
Calculate daily calorie needs for weight loss, maintenance, or muscle gain based on your goals and activity level.