Calculate your ideal body weight range using four proven medical formulas.
Calculate Ideal Weight ↓Results shown for four widely-used formulas: Devine, Robinson, Miller, and Hamwi.
Results by formula:
Developed in 1974 by Dr. B.J. Devine, originally to help calculate drug dosages for obese patients where standard weight-based dosing didn't apply well. It remains the most commonly referenced formula in clinical and pharmacy settings today, decades after its original narrow purpose.
A 1983 revision by Robinson et al. that produces slightly lower estimates than Devine, based on a larger and more representative dataset of the era. Many clinicians consider it a modest improvement, though the difference from Devine is usually only a kilogram or two.
Published in 1983, the Miller formula tends to give the lowest estimates among the four, particularly for taller individuals. Some researchers argue it better reflects realistic, sustainable body weights rather than a narrower clinical ideal.
Created by Dr. George Hamwi in 1964, this formula is often used as a starting baseline, then manually adjusted ±10% for small or large body frame size — something the other three formulas don't account for directly, which is why results can vary between formulas for the same person.
All four formulas share the same basic approach: they were built by fitting a straight-line equation to height-weight data from specific study populations, decades ago. None of them account for muscle mass, bone density, age, or body fat distribution — they only use height and gender as inputs. That's why we show an average across all four rather than picking a single 'correct' number: the spread between them (often 3-5 kg) is a more honest picture than false precision from just one formula.
These formulas are best treated as a rough starting reference, not a strict target. A muscular, athletic person will likely weigh more than any of these formulas suggest and still be perfectly healthy. If you want a measure that reflects body composition rather than just a height-based estimate, pair this result with our BMI Calculator and Body Fat Percentage Calculator for a fuller picture.