Ideal Weight Calculator
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General information only, not medical advice. Talk to a doctor or registered dietitian before making health decisions.
What this calculator does
Enter your height and sex to see your ideal body weight according to four well-known formulas, shown in both kilograms and pounds. Under them you will find the healthy weight range for your height, based on a BMI of 18.5 to 24.9. Together they give a realistic range to aim for rather than one exact number.
How to use it
- Choose your sex and units.
- Enter your height.
- Compare the four formula results and the healthy BMI range.
Formulas and sources
All four formulas add a fixed amount for each inch of height above 5 feet (60 inches):
- Devine (1974): men 50 kg + 2.3 kg per inch; women 45.5 kg + 2.3 kg per inch.
- Robinson (1983): men 52 kg + 1.9 kg per inch; women 49 kg + 1.7 kg per inch.
- Miller (1983): men 56.2 kg + 1.41 kg per inch; women 53.1 kg + 1.36 kg per inch.
- Hamwi (1964): men 106 lb + 6 lb per inch; women 100 lb + 5 lb per inch.
Example: a man who is 5 ft 10 in (10 inches over 5 ft) gets 73 kg from the Devine formula.
Please note
The Devine formula was originally created to help estimate medication doses, and all four formulas are only rough guides. Age, muscle, bone structure and health all matter. Do not use the result as a weight-loss target without medical advice. If you are worried about your weight, speak to a doctor or dietitian. Your numbers stay in your browser.
Frequently asked questions
Why do the four formulas give different answers?
Each was developed by a different researcher for a different purpose, using different data. They agree roughly but differ by a few kilograms, so treat them as a range rather than a single target.
Is "ideal weight" the same as a healthy weight?
Not exactly. The classic formulas give a single reference number. A healthy weight is better described as a range, which is why the BMI range of 18.5 to 24.9 is shown too.
Do the formulas account for age or muscle?
No. They only use your height and sex, so they ignore age, muscle mass, bone structure and body shape. Athletes and older adults may be healthy outside the results.
Why is there a warning for short heights?
The Devine, Robinson, Miller and Hamwi formulas start from 5 feet (152 cm). Below that they simply show the 5-foot value, so use the BMI range instead.