Ideal Weight Calculator
Enter your height and sex and we show four well-known ideal weight estimates alongside the healthy range from BMI.
This calculator gives general estimates for information only. It is not medical advice and does not replace a consultation with a doctor or other qualified health professional.
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The formula
Devine (men): 50 kg + 2.3 kg per inch over 5 ft. Women: 45.5 kg + 2.3 kg per inch over 5 ft.
Four formulas, one rough answer
The Devine, Robinson, Miller and Hamwi formulas were all written between the 1960s and 1980s, some originally to help doctors dose medicines. They all start from 5 feet and add a set weight for each extra inch, which is why their answers are close but not the same. We show the average too.
The healthy BMI range is better
These formulas give one number, but there is no single ideal weight. The range from BMI 18.5 to 24.9 is wider and more realistic. A 180 cm man, for example, is in the healthy range at anything from about 60 to 81 kg.
What they do not know
They ignore frame size, muscle, age and how you carry weight. Someone with a large frame or lots of muscle can be healthy well above the formula's answer. Use these as guidance and look at how you feel, your fitness and your blood tests.
Examples to check
Type these into the calculator above to see how it behaves. Every result below was produced by the same calculator code that runs on this page.
| What you enter | What you get |
|---|---|
| Male; Height (cm): 180 | Average of four formulas: 74.1 kg |
| Female; Height (cm): 165 | Average of four formulas: 57.7 kg |
| Female; Height (feet): 5; Height (inches): 4 | Average of four formulas: 123.3 lb |
| Male; Height (cm): 170 | Average of four formulas: 65.9 kg |
Ideal Weight Calculator: frequently asked questions
Which formula is the most accurate?
None is. They give similar answers for average heights. The BMI-based range is the most commonly recommended starting point.
Do the formulas work for short or tall people?
They were designed around heights from about 5 feet. We only accept heights between 4 ft and 8 ft (122 to 244 cm).
Can I rely on this result as medical advice?
No. It is a general estimate for information only. It cannot replace a check-up, and your doctor can interpret the numbers for your own situation.
Is what I enter in this calculator saved or sent anywhere?
No. The calculation runs in your browser, so what you enter is not sent to our servers. We only count, anonymously, whether a tool ran successfully.
Is this calculator free to use?
Yes. It is free, needs no sign-up and has no usage limit.
Last reviewed: October 3, 2026