⚖️ Ideal Weight Calculator
There is no single “ideal” weight, but medicine has used height-based formulas for decades to dose drugs and set healthy ranges. This calculator shows four of the classic ones side by side so you can see the range they agree on.
These formulas were designed for adults of average build. Frame size, muscle mass and age all shift what is healthy for you personally.
How to use this calculator
Select your gender and enter your height, and the tool shows what four classic medical formulas say your healthy weight should be.
- Select your Gender from the dropdown.
- Enter your Height in centimetres.
- Compare the four results: Devine, Robinson, Miller and Hamwi.
- Treat the cluster of values as your healthy range rather than one magic number.
Frequently asked questions
What does this calculator compute and what are the inputs?
It gives you four different estimates of a healthy body weight, one from each classic medical formula, shown side by side in kilograms. You only supply your gender and height.
Which formulas does it use?
Devine, Robinson, Miller and Hamwi: height-based equations that add a set number of kilos per inch above five feet, with different baselines for men and women. They were originally created for drug dosing and are still used as reference ranges.
Can you show a worked example?
A man who is 175 cm tall gets about 70.5 kg from Devine, 68.9 kg from Robinson, 68.7 kg from Miller and 72.0 kg from Hamwi. The four agree on a sensible range of roughly 68 to 72 kg.
Does one formula win over the others?
Not really: they disagree by a kilo or two on purpose, which is the point of showing all four. They also assume an average build, so muscular people and older adults should treat the range as a guide and check with a clinician for anything personal.