Body Roundness Index Calculator for Women

BRI Equation for Women:

\[ BRI = 364.2 - 365.5 \times \sqrt{1 - \left(\frac{WC}{2\pi H}\right)^2} \]

Body Roundness Index (BRI):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Body Roundness Index?

The Body Roundness Index (BRI) is a geometric shape measurement that estimates body fat percentage based on waist circumference and height. It provides an alternative to BMI by considering body shape rather than just weight and height.

2. How Does the Calculator Work?

The calculator uses the BRI equation for women:

\[ BRI = 364.2 - 365.5 \times \sqrt{1 - \left(\frac{WC}{2\pi H}\right)^2} \]

Where:

\( WC \) — Waist circumference (cm)
\( H \) — Height (m)
\( \pi \) — Mathematical constant pi (~3.1416)

Explanation: The equation models the body as an ellipse to estimate body roundness and fat percentage.

3. Importance of BRI Calculation

Details: BRI correlates with body fat percentage and health risks associated with abdominal obesity. It may provide better health risk stratification than BMI alone.

4. Using the Calculator

Tips: Measure waist circumference at the midpoint between the lower rib and the top of the hip bone. Enter height in meters (1 m = 100 cm).

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BRI range?
A: Generally, BRI values below 3 indicate low risk, 3-6 moderate risk, and above 6 high risk for obesity-related conditions.

Q2: Why is this specific to women?
A: The equation uses coefficients specifically validated for women's body shapes.

Q3: How does BRI compare to BMI?
A: BRI considers body shape rather than just weight, potentially better identifying abdominal obesity risks.

Q4: When should I measure my waist circumference?
A: Measure in the morning before eating, at the end of a normal breath.

Q5: Are there limitations to BRI?
A: Like all indices, it has limitations in athletes, pregnant women, and those with unusual body proportions.