Body Roundness Index (BRI) Calculator

Estimate body roundness from waist and height.

Waist circumference

Height

Body roundness index 3.095

Formula: BRI = 364.2 − 365.5 × √(1 − eccentricity²)

Step-by-step with your numbers:

1. Values used:

2. Waist circumference = 85

3. Height = 175

5. Body roundness index = 3.095

Did we solve your problem today?

BRI models the body as an ellipse to estimate visceral fat. Informational only.

The math behind it

BRI uses waist and height to compute an eccentricity-based roundness score (typically ~1–16).

85 cm waist, 175 cm → ~3.4.

Higher means?

Rounder body shape — more central fat.