Ideal Body Weight (IBW) Calculator
Determine your medically ideal body weight range using 4 distinct clinical formulas (Devine, Robinson, Miller, Hamwi). Understand healthy weight targets based on height and gender.
About
The concept of "Ideal Body Weight" (IBW) was originally developed for determining drug dosages, not necessarily for aesthetic goals. However, these formulas have become the standard for estimating a healthy weight baseline based on skeletal height. Unlike BMI, which accounts for total mass, IBW formulas try to identify a target weight that is statistically associated with the lowest mortality rates.
Since no single body type exists, this tool calculates your IBW using four different respected medical algorithms. The variation between these results provides a realistic "target zone" rather than a single, rigid number. This helps account for differences in frame size and muscle mass.
Formulas
Most IBW formulas follow a base weight plus a specific weight for every inch of height over 5 feet.
Devine Formula (Male):
Devine Formula (Female):
Reference Data
| Formula Name | Year | Primary Use Case | Methodology (Male Base) |
|---|---|---|---|
| Devine Formula | 1974 | Standard for Drug Dosing | 50kg + 2.3kg per inch over 5ft |
| Robinson Formula | 1983 | Update to Devine | 52kg + 1.9kg per inch over 5ft |
| Miller Formula | 1983 | lean Mass Estimation | 56.2kg + 1.41kg per inch over 5ft |
| Hamwi Formula | 1964 | General Framework | 48kg + 2.7kg per inch over 5ft |
| BMI Range | N/A | WHO Classification | 18.5 - 24.9 kg/m² |