IBW Calculator for Women
Specialized body weight assessment for women. Accounts for female anthropometry using Robinson and Hamwi equations with metabolic health tips.
Devine & Robinson Average
Lower end of Hamwi (Frame adjusted)
About
Standard weight charts often fail to account for the unique physiological requirements of the female body, including essential fat stores required for hormonal regulation and bone density protection. This specialized tool prioritizes the Robinson and Hamwi equations, which historically align closer with female anthropometry than the muscular-bias of other formulas.
We distinguish between "Medical Ideal" (optimized for longevity and organ function) and "Aesthetic Standards," providing a judgment-free zone to assess your metrics. Results are accompanied by metabolic health tips designed to support cortisol balance and thyroid function.
Formulas
The core calculations use a base weight of 45.5 kg (approx 100 lbs) for the first 5 feet of height, adding increments for every inch thereafter.
Robinson (1983) - Female:
W = 49.0 + 1.7 × (Inches over 5ft)Hamwi (1964) - Female:
W = 45.5 + 2.2 × (Inches over 5ft)These formulas are mathematically smoothed to prevent abrupt jumps between height increments.
Reference Data
| Metric | Target Range (Women) | Health Implication |
|---|---|---|
| Essential Fat | 10-13% | Critical for hormonal cycle |
| Athletic Fat | 14-20% | High performance, high maintenance |
| Fitness Fat | 21-24% | Sustainable, energetic |
| Acceptable | 25-31% | Standard health range |
| IBW Variance | ±10% | Accounts for cycle fluctuation |