Body Roundness Index (BRI) Calculator
The Body Roundness Index (BRI) is a measurement tool that evaluates body shape and health risk based on height and waist circumference. It provides an assessment of body fat distribution and associated health risks.
When to Use BRI Calculator
Consider using the BRI calculator in these situations:
- When you want to assess your overall body shape and potential health risks
- As part of a comprehensive health screening to evaluate cardiovascular risk factors
- When monitoring changes in body composition during weight loss or fitness programs
How to Calculate BRI
The Body Roundness Index is calculated using the following formula:
BRI = 364.2 - (365.5 × e)
Where:
- e = eccentricity
- e = √[1 - (WC/(2π))²/(0.5×h)²]
- WC = waist circumference in meters
- h = height in meters
BRI Risk Categories
| BRI Range | Risk Category |
|---|---|
| < 3.41 | Moderate Risk |
| 3.41 - 4.44 | Low Risk |
| 4.45 - 5.45 | Very Low Risk |
| 5.46 - 6.90 | Moderate Risk |
| > 6.90 | High Risk |
Example Calculation
Let's calculate the BRI for a person with:
- Height: 170 cm (1.7 m)
- Waist Circumference: 80 cm (0.8 m)
Step 1: Calculate eccentricity
e = √[1 - (0.8/(2π))²/(0.5×1.7)²]
e = √[1 - (0.127324)²/(0.85)²]
e = √[1 - 0.016211/(0.7225)]
e = √[1 - 0.022438]
e = √0.977562
e ≈ 0.9887
Step 2: Calculate BRI
BRI = 364.2 - (365.5 × 0.9887)
BRI = 364.2 - 361.375
BRI ≈ 2.82
According to the BRI risk categories, a BRI of 2.82 corresponds to a Moderate Risk category.