BRI & BMI Calculator

The Best BRI and BMI Calculator for Free!

Free, fast, and reliable BRI and BMI calculator.

Calculate Your BRI and BMI

What is BRI or Body Roundness Index ?

Body Roundness Index (BRI) is a measure of body shape that takes into account both height and waist circumference. It provides an estimate of body fat distribution and can be used as an indicator of health risks associated with body shape and it's more acurate then (BMI) Body Mass Index.

How to Calculate BRI?

The Body Roundness Index is calculated using the following formula, where waist and height are measured in meters.

BRI = 364.2 - (365.5 * √(1 - ((0.5 * waist / (0.5 * height))Β² / (2 * Ο€))))

How to use BRI Calculator?

  1. Select the measurement system you prefer: Metric (cm) or Imperial (inches).
  2. Enter your waist circumference and height. See The Accurately Measuring Your waist section.
  3. Click the "Calculate BRI" button to get your Body Roundness Index.
  4. Review your results to understand your body composition better.

Guide: Accurately Measuring Your waist

  1. Use a flexible measuring tape. Upgrade to professional-grade precision measuring tape β†’
  2. Stand up straight and locate your natural waist (the narrowest part of your torso, usually just above your belly button).
  3. Wrap the tape around your waist horizontally, keeping it parallel to the floor.
  4. Make sure the tape is snug but not too tight - you should be able to fit one finger underneath.
  5. Don't hold your breath or suck in your stomach while measuring.
  6. Record the measurement in centimeters or inches, depending on your preferred unit.
Waist circumference measurement guide showing different body types

Visual guide showing waist circumference measurements for both sexes

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Frequently Asked Questions

BMI does not differentiate between muscle and fat mass, leading to potential misclassification. For example, muscular individuals may be categorized as overweight or obese, while those with low muscle mass but high body fat may fall within a "normal" range. It also does not account for fat distribution, which is important in assessing health risks.

BRI provides information about body shape and fat distribution, which can be indicators of health risks.

Unlike BMI, BRI takes into account body shape by incorporating waist circumference, providing a more comprehensive assessment of body composition.

A BRI value between 3.4 and 4.45 is generally considered normal, with values above 5 indicating increased health risks.

The World Health Organization (WHO) defines a healthy BMI range as 18.5 to 24.9. A BMI below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 or above is classified as obese. These categories help assess potential health risks, but they may not apply perfectly to everyone due to individual differences in muscle mass and body composition.

Yes, BRI can be used to predict health risks such as cardiovascular disease, diabetes, and metabolic syndrome. By considering waist circumference, it provides insight into abdominal fat, which is more closely associated with these conditions than overall body weight alone.

BRI is considered more accurate than BMI for estimating health risks associated with body fat, as it incorporates waist circumference to better reflect fat distribution. However, both are useful tools, and their effectiveness may vary depending on individual circumstances. Combining them with other health assessments can provide a more comprehensive evaluation.

Waist circumference is a useful indicator of health risk, particularly for assessing abdominal fat, which is linked to conditions like heart disease and diabetes. However, using it in combination with other measures like BMI or BRI can provide a more comprehensive evaluation of health risks.

References for Body Roundness Index

Scientific sources supporting our Body Roundness Index (BRI) calculator

1

Thomas, D. M., et al. (2013).

Relationships between body roundness with body fat and visceral adipose tissue emerging from a new geometrical model

Obesity, 21(11), 2264-2271.

This foundational study introduced the Body Roundness Index as a novel anthropometric measure for assessing body shape and predicting visceral adipose tissue distribution.

2

Chang, Y., et al. (2018).

Body roundness index and its association with metabolic syndrome in type 2 diabetes mellitus

Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy, 11, 827-833.

Research demonstrating BRI's effectiveness in identifying metabolic syndrome risk in patients with type 2 diabetes, showing superior predictive value compared to BMI.

3

Perona, J. S., et al. (2019).

Waist circumference and abdominal volume index are the strongest anthropometric discriminators of metabolic syndrome in Spanish adolescents

European Journal of Clinical Investigation, 49(3), e13060.

Study validating waist-based measurements including BRI components for assessing metabolic health risks in younger populations.

4

Rico-MartΓ­n, S., et al. (2020).

Effectiveness of body roundness index in predicting metabolic syndrome: A systematic review and meta-analysis

Obesity Reviews, 21(9), e13023.

Comprehensive meta-analysis confirming BRI's superior accuracy in predicting metabolic syndrome across diverse populations compared to traditional anthropometric measures.

5

Zhang X, Ma N, Lin Q, et al. (2024)

Body Roundness Index and All-Cause Mortality Among US Adults

JAMA Netw Open, 2024;7(6):e2415051.

the application of BRI as a noninvasive and easy to obtain screening tool for estimation of mortality risk and identification of high-risk individuals.