This ideal-weight calculator compares Devine, Robinson, Miller, and Hamwi adult formulas and shows weights corresponding to BMI 18.5 and 24.9.
Health
Ideal Weight Calculator
Compare four adult ideal-weight formulas and a standard BMI weight range.
Calculator
About this calculator
Formula notes
Each historical formula starts with a sex-specific weight at 5 ft and adds or subtracts a fixed amount per inch; BMI reference weight = BMI × height².
Worked examples
- Example: for a 180 cm male, the four estimates average about 74.12 kg and the BMI 18.5–24.9 range is about 59.94–80.68 kg.
- For a 180 cm adult male, the four displayed formulas range from about 71.52 kg to 77.34 kg, with an average near 74.12 kg.
How to use it
- Select the adult sex used by the formulas.
- Enter height and confirm its unit.
- Compare the four estimates rather than treating one as an exact target.
Frequently asked questions
Why do the formulas disagree?
They were derived from different historical samples and use different starting weights and per-inch adjustments.
Is the displayed average a medical recommendation?
No. It is only the arithmetic mean of four estimates and cannot replace an individualized health assessment.
Limits and interpretation
- Ideal-weight equations are historical population estimates, not individualized targets, and do not account for body composition, disability, ethnicity, age, pregnancy, or clinical history.
- The BMI-derived range is a screening reference for adults and is not a diagnosis or a prescription to gain or lose weight without professional assessment.