Ideal Weight Calculator
Ideal body weight by the Devine, Robinson, Miller and Hamwi formulas, alongside the healthy BMI weight range.
About Ideal Weight Calculator
This ideal weight calculator shows your ideal body weight in kg using four well-known formulas: Devine, Robinson, Miller and Hamwi. Choose male or female, enter your height in centimetres or in feet and inches, and compare the results side by side with the healthy weight range from BMI.
Because each formula gives a slightly different answer, seeing them together gives you a sensible target range rather than a single number. It is useful when setting weight goals or checking what a healthy weight is for a 5 ft 3 in woman or a 5 ft 9 in man. It is free, needs no sign-up and runs in your browser.
How to use Ideal Weight Calculator
- Choose sex.
- Enter your height in cm or feet and inches.
- Compare the four formula results and the healthy BMI range.
Frequently asked questions
Which ideal weight formula is best?
None is perfect. Devine (1974) is widely used for medication dosing; Robinson and Miller were refinements. The BMI range is broader and more practical for everyday goals.
Are these formulas valid for short heights?
They were designed for adults 5 ft (152.4 cm) and taller. Below that the results are extrapolated and less reliable.
Does frame size matter?
Yes. People with a larger frame can reasonably weigh about 10% more than the formula result, and small frames about 10% less.
What is ideal body weight (IBW)?
IBW is an estimate of a healthy weight for your height and sex, originally used for medicine dosing. The Devine formula is the most widely used version.
How is IBW calculated?
The Devine formula uses 50 kg for men or 45.5 kg for women, plus 2.3 kg for every inch over 5 feet.
Is ideal body weight accurate?
It is a rough guide that ignores muscle mass and frame size. Use it alongside the BMI range rather than as a strict target.
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