Calculate Your BRI and BMI for Free!

Free, fast, and reliable BRI & BMI calculator.

Calculate Your BRI and BMI

What is 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.

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))² / (2 * π))))

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 Accurately Measuring Your Wrist
  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 Wrist

  1. Use a flexible measuring tape or a strip of paper and a ruler. Get the best results with this Body Measuring Tape
  2. Wrap the tape or paper around the widest part of your wrist, just below the wrist bone.
  3. Make sure the tape is snug but not too tight.
  4. If using paper, mark where the end meets the loop and measure the length with a ruler.
  5. Record the measurement in centimeters or inches, depending on your preferred unit.

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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.