Ideal Weight Calculator
Estimate your ideal weight from your height and sex using four classic medical formulas: Devine, Robinson, Miller and Hamwi. Ideal weight is a guideline, not a target — healthy bodies come in a range of weights.
What this means
Ideal body weight formulas predict a reference weight for a given height and sex. They were developed for medication dosing, so treat them as a range rather than an exact prescription.
How we calculate it
Formula
Base weight for 60 inches plus 2.3 (Devine), 1.9 (Robinson), 1.41 (Miller) or 2.7 (Hamwi) kg per extra inch.Worked example
A woman 165 cm tall:
- 1165 cm = 65 inches (5'5")
- 2Robinson: 49 + 1.7×5 = 57.5 kg
- 3Devine: 45.5 + 2.3×5 = 57 kg
Important assumptions
- Formulas assume an average build and do not account for frame size or muscle.
Frequently asked questions
What is my ideal weight for my height?
A healthy range, not a single number. Use the BMI healthy range as the broad target; the formulas give a narrower estimate.
Why do the formulas disagree?
Each was derived from different populations and eras. The spread between them is normal — aim for the middle of the range.
Guide
BMI Calculator Guide: How to Read Your Body Mass Index
BMI is a quick screening number, not a diagnosis. Here is how to use it correctly and what to look at next.
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