Free BRI Calculator

BRI (Body Roundness Index) is a modern health metric that estimates body shape and fat distribution - specifically abdominal fat - using waist circumference and height. It’s designed to provide a more accurate assessment of health risks than traditional BMI.

BMI (Body Mass Index) calculates body fat based on height and weight.
BRI focuses on waist size and height, making it more sensitive to central obesity—the fat stored around internal organs.
BRI gives a better estimate of health risks, especially for conditions like heart disease, diabetes, and some cancers.

BMI can be misleading:
- It doesn’t differentiate between fat and muscle.
- It doesn’t reflect fat distribution, which is critical in assessing health risk.
- It may misclassify athletes or older adults.
BRI addresses these issues by focusing on abdominal fat, a major risk factor for chronic illness. Research, including studies published in JAMA Network Open, has found BRI to be a better predictor of mortality and disease than BMI.

BRI requires:
Waist circumference
Height
It uses a specific formula developed by Thomas et al., producing a score between 1 and 20. The higher the score, the greater the roundness and the higher the risk related to abdominal fat.

Low BRI (Smaller than 3.4): Indicates minimal abdominal fat, representing a healthier body composition. However, extremely low scores might signal risks tied to being underweight.
BRI between 3.4 and 5.5: Suggests a balanced body shape, often reflecting the healthiest range for most individuals.
BRI between 5.5 and 6.9: Your BRI is slightly above the optimal range. While the risk is not as high as in extreme cases, it’s recommended to adopt healthier habits to reduce potential risks.
High BRI (Larger than 6.9): Reflects a higher concentration of visceral fat in the abdominal region. This is linked to an elevated risk of serious conditions such as cardiovascular disease, Type 2 diabetes, and other obesity-related illnesses. Research shows a 49% increased risk of all-cause mortality for those with a BRI of 6.9 or greater. It is recommended to consult a healthcare professional for personalized advice.

Yes! Our BRI calculator is:
✅ Free
✅ Anonymous
✅ Privacy-focused (works directly in your browser—no data sent)
✅ Supports both inches and centimeters
Just enter your waist and height to get instant results.

No. While BRI is a useful tool for self-assessment, it’s not a substitute for a medical diagnosis. Always consult a healthcare professional for a full evaluation of your health.

BRI is gaining traction. Studies like the one by Zhang et al. (2024) in JAMA Network Open show that BRI outperforms other metrics in predicting all-cause mortality and health risks, making it a valuable tool in preventive healthcare.