Ideal Weight Calculator
Healthy weight range for your height, with four classic formulas compared.
How to use Ideal Weight Calculator
- Choose units and your sex.
- Enter your height.
- Read the healthy range and compare the four formulas.
How it works
The headline range is the weight that gives a BMI of 18.5 to 24.9 at your height, the World Health Organization’s healthy range for adults: weight = BMI × height in metres squared.
Four formulas are shown for comparison. Each starts from a base weight at 5 ft (152.4 cm) and adds a fixed amount per inch (2.54 cm) above that: Devine (1974) men 50 kg + 2.3, women 45.5 kg + 2.3; Robinson (1983) men 52 + 1.9, women 49 + 1.7; Miller (1983) men 56.2 + 1.41, women 53.1 + 1.36; Hamwi (1964) men 48 + 2.7, women 45.5 + 2.2. They were created to set medicine doses, not to define a perfect body, which is why they disagree with each other.
Example
A man 5 ft 10 in (177.8 cm): Devine 50 + 2.3 × 10 = 73.0 kg, Robinson 71.0, Miller 70.3, Hamwi 75.0. The healthy BMI range at that height is 58.5–78.7 kg.
Frequently asked questions
What is my ideal weight?
There is no single number. A healthy weight is a range that depends on height, build, muscle and age. Use the BMI range as the broad guide and the formulas as reference points inside it.
Which formula is best?
None is "correct". Devine is the most widely used in medicine for dosing. If the four are close together for your height, their average is a reasonable midpoint.
Do the formulas account for age or frame size?
No. They use only height and sex. People with large frames or a lot of muscle can be healthy above them.
Why does the range seem wide?
Because healthy bodies vary. At 175 cm the healthy BMI range spans about 20 kg.
Limitations
- Adults only; children and teenagers need age-specific growth charts.
- The four formulas are unreliable below 5 ft (152.4 cm); the tool says so.
- Ignores muscle mass, frame size, age and ethnicity.
- An estimate for healthy adults, not medical advice. Talk to a doctor or registered dietitian about your own situation.
Last reviewed November 9, 2026. How we build and test tools.