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Assess your cardiovascular and metabolic health risk based on body shape
Measure around your waist at the level of your belly button
The Body Roundness Index (BRI) is a novel anthropometric measure that estimates body shape and visceral fat distribution. It combines waist circumference and height to create a three-dimensional assessment of body roundness, which correlates with cardiovascular and metabolic health risks.
BRI = 364.2 - 365.5 × √(1 - ((Waist/2π)² / (0.5×Height)²))
| Metric | Measurements | Primary Use |
|---|---|---|
| BRI | Waist, Height | Visceral fat & shape assessment |
| BMI | Weight, Height | General weight classification |
| Waist-to-Height | Waist, Height | Central obesity screening |
| Waist-to-Hip | Waist, Hip | Fat distribution pattern |
Research shows BRI is a strong predictor of:
Stand upright and breathe normally. Place a measuring tape around your waist at the level of your belly button (umbilicus). The tape should be snug but not compress the skin. Take the measurement at the end of a normal breath.
BRI provides complementary information to BMI. While BMI measures overall weight relative to height, BRI specifically assesses body shape and central fat distribution, which are important indicators of metabolic health. Using both together provides a more complete picture.
Greater body roundness typically indicates more visceral fat (fat around internal organs), which is associated with increased risk of cardiovascular disease, type 2 diabetes, and metabolic syndrome. BRI quantifies this shape to predict health risks.
Yes, BRI can be used by athletes and is often more informative than BMI, which may misclassify muscular individuals. However, some athletes with developed core muscles may have higher waist measurements despite low body fat. Consider using multiple assessment tools.
For health monitoring, calculating BRI every 3-6 months is reasonable. If you're actively working on body composition changes, monthly measurements can help track progress. Always measure under similar conditions for consistency.
Aim for a BRI below 3.4 for optimal health. Values between 3.4 and 4.5 suggest moderate risk and may warrant lifestyle modifications. Values above 4.5 indicate high risk and should prompt consultation with healthcare providers.
BRI has been validated primarily in adult populations. While it can be used across different age groups, the risk thresholds may need adjustment for older adults. Children and adolescents should use age-specific growth charts and percentiles instead.
Reducing BRI involves decreasing waist circumference through a combination of healthy eating, regular physical activity (especially aerobic exercise), strength training, stress management, and adequate sleep. Focus on reducing visceral fat through sustainable lifestyle changes.
This calculator is for educational and informational purposes only and should not be considered medical advice. BRI is a screening tool and should not be used as the sole indicator of health status or disease risk. Individual health varies based on many factors including genetics, medical history, and lifestyle. Always consult with qualified healthcare professionals for personalized medical advice, diagnosis, or treatment plans, especially if you have concerns about cardiovascular or metabolic health.