⚖️Ideal Weight Calculator

About this tool

Choose male or female, metric or imperial, and enter your height. The tool shows the result of each of the four classic ideal-body-weight formulas, the range they agree on, and the weight range that gives a BMI of 18.5–24.9 for that height. Nothing is stored.

Where the formulas come from, and their limits

All four formulas start from a base weight at five feet (152.4 cm) and add a fixed amount per inch above it: Devine (1974) uses 50 kg + 2.3 kg per inch for men and 45.5 kg + 2.3 kg for women; Robinson and Miller (both 1983) refitted the numbers to population data; Hamwi (1964) is the oldest and steepest. For a 175 cm man they give roughly 69–72 kg, which is why they are quoted together as a band. Context matters: Devine's formula was published to calculate medicine doses, not to tell anyone what they should weigh, and none of the four considers muscle mass, frame size, age or ethnicity — an athlete can be well above them and healthy. The healthy-BMI range (18.5–24.9) is the screening range used by the WHO and national health services, with the same caveats about muscle. Below five feet the formulas subtract and become unreliable; use the BMI range there. General information, not medical advice. The BMI calculator gives your current BMI, the body fat calculator estimates composition (How body fat percentage is estimated — and how much to trust each method explains the methods), and the calorie calculator sets an intake; How daily calorie needs are calculated — BMR, activity multipliers and what a deficit means covers the maths.

Frequently asked questions