Ideal Weight Calculator
Ideal body weight is an estimate of a healthy weight for your height. There is no single correct number, so this calculator shows several well-known clinical formulas alongside the healthy weight range for a normal BMI, giving you a realistic band rather than one figure.
How it works
The Devine, Robinson and Hamwi formulas all start from a base weight at five feet of height and add a fixed amount for every inch above that, with different constants for men and women. The healthy range is worked out from a BMI of 18.5 to 24.9 for your height.
Devine men: 50 + 2.3 × (inches over 5 ft). Devine women: 45.5 + 2.3 × (inches over 5 ft).Example. For a man of 175 cm (about 68.9 inches), the Devine ideal weight is about 70.5 kg, while the healthy BMI range for that height is roughly 56.7 to 76.3 kg.
Why show a range, not one number
The classic formulas were designed for medication dosing, not body image, and they ignore build, muscle and frame size. A muscular person can be heavier than their formula weight and still be healthy. Treat the BMI range as the realistic target and the formulas as reference points.
Frequently asked questions
Which ideal weight formula is most accurate?
The Devine formula is the most widely used in clinical settings, but all of these are rough estimates. The healthy BMI range is often a more practical target for most people.
Does ideal weight account for muscle?
No. These formulas use only height and sex, so they can understate a healthy weight for muscular or large-framed people. Body fat percentage is a better guide to body composition.
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is considered the normal range for most adults. This calculator converts that range into a weight band for your height.
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