Ideal Body Weight Calculator
Find your ideal weight range based on height and sex using four medically recognised formulas — Hamwi, Devine, Robinson, and Miller.
Ideal Weight Results
Enter your height and click Calculate.
About the Ideal Body Weight Formulas
| Formula | Year | Originally Designed For |
|---|---|---|
| Hamwi | 1964 | Clinical nutrition — used by dietitians and hospitals |
| Devine | 1974 | Dosing medications based on body weight in clinical settings |
| Robinson | 1983 | Revision of Devine formula for drug dosing |
| Miller | 1983 | Lighter ideal weights, especially for women |
Frequently Asked Questions
Ideal body weight (IBW) is an estimate of the most favourable weight for a given height, originally developed for clinical drug dosing and nutritional planning. It is not a strict target — it is a reference point. A healthy weight range based on BMI (18.5–24.9) is often more practical for most people.
Each formula was developed in a different decade and for a different clinical purpose. They use slightly different base weights and per-inch increments. The differences are usually small (2–4 kg). The range across all four formulas represents the realistic target zone.
IBW formulas are rough guides. For practical weight management, focus on staying within the BMI 18.5–24.9 range. Athletes or muscular individuals may be above IBW while still healthy. Always consult a doctor or dietitian for personalised targets.
