What is Ideal Body Weight (IBW)?
Ideal Body Weight (IBW) represents a statistical estimation of the body weight associated with optimal human health, longevity, and reduced chronic disease mortality. While originally developed in the 1960s and 1970s by clinical pharmacologists to calculate precise therapeutic dosages of water-soluble medications (such as theophylline and aminoglycosides), IBW formulas are now widely utilized in sports science, clinical dietetics, and preventive medicine.
| Equation | Men (kg) | Women (kg) |
|---|---|---|
| Devine (1974) | 50.0 + 2.3 × (Height in inches - 60) | 45.5 + 2.3 × (Height in inches - 60) |
| Robinson (1983) | 52.0 + 1.9 × (Height in inches - 60) | 49.0 + 1.7 × (Height in inches - 60) |
| Miller (1983) | 56.2 + 1.41 × (Height in inches - 60) | 53.1 + 1.36 × (Height in inches - 60) |
| Hamwi (1964) | 48.0 + 2.7 × (Height in inches - 60) | 45.5 + 2.2 × (Height in inches - 60) |
Body Frame Size Classification Table
Skeletal frame size significantly affects natural, healthy body weight. A person with a large frame carrying broad bone architecture will naturally weigh 10% more than someone with a small frame at the identical height and body fat percentage. Frame size is determined by measuring wrist circumference:
| Gender & Height | Small Frame (Wrist Size) | Medium Frame (Wrist Size) | Large Frame (Wrist Size) | IBW Weight Adjustment |
|---|---|---|---|---|
| Men (Height > 5'5") | < 6.5 inches (< 16.5 cm) | 6.5" – 7.5" (16.5–19.0 cm) | > 7.5 inches (> 19.0 cm) | Small: -10% | Medium: 0% | Large: +10% |
| Women (Height 5'2" – 5'5") | < 6.0 inches (< 15.2 cm) | 6.0" – 6.25" (15.2–15.9 cm) | > 6.25 inches (> 15.9 cm) | Small: -10% | Medium: 0% | Large: +10% |