What's your Body Roundness Index?
A better measure of central adiposity than BMI
Medical Disclaimer: This tool provides general educational estimates. Always consult your prescribing physician or healthcare provider before making medication changes or interpreting results from population-based models.
Frequently Asked Questions
BRI is a metric that estimates central adiposity (belly fat) using only height and waist circumference. It was developed by Thomas et al. in 2013 and models the body as an ellipse to capture shape, not just weight.
BMI uses weight and height but cannot distinguish muscle from fat or detect where fat is stored. BRI uses waist circumference to specifically measure central adiposity, which is more strongly linked to health risks.
A BRI below 3.41 is considered lean/healthy. BRI 3.41-4.45 is overweight range, 4.45-5.73 is obese, and above 5.73 is high risk.
Sources
- Thomas DM, et al. Relationships between body roundness with body fat and visceral adipose tissue. Obesity. 2013;21(11):2264-2271. Link
Methodology
BRI = 364.2 - 365.5 × √(1 - ((WC / (2π))² / (0.5 × H)²)), where WC = waist circumference in meters and H = height in meters. The formula models the body as a prolate ellipse and estimates body roundness from the relationship between waist circumference and height.
Body Roundness Index (BRI) measures central adiposity using height and waist circumference. BRI below 3.41 is lean/healthy, 3.41-4.45 overweight, 4.45-5.73 obese, above 5.73 high risk. Unlike BMI, BRI captures body shape and fat distribution, making it a better predictor of cardiovascular and metabolic risk.
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