How to Calculate Body Roundness Index (BRI)
What is Body Roundness Index (BRI)?
Body Roundness Index (BRI) uses waist circumference and height to estimate body roundness. BRI = 364.2 − 365.5√(1 − (W/2π)²/(0.5H)²). Better predictor of visceral fat than BMI.
Step-by-Step Guide
- 1W = waist circumference · H = height (same units)
- 2BRI range: 1 (very lean) to ~15 (very obese)
Worked Examples
Input
Waist 85cm · Height 175cm
Result
BRI ≈ 3.4 (healthy range)
BRI < 4 generally lower risk
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