BRI Score Chart — Body Roundness Index Ranges Explained
A complete reference for interpreting your BRI score, with color-coded ranges, male and female tables, and age-adjusted context.
Calculate Your BRI Free →BRI Scale — Visual Overview
The Body Roundness Index (BRI) runs from near 0 (extremely lean) to above 9 (severely obese). The scale below shows how BRI maps to health categories established by Thomas et al. (2013), the researchers who developed the index.
<3.41
3.41–4.45
4.45–5.46
5.46–6.91
Scale shown up to BRI 16 for visual clarity; scores above 9 are rare and all indicate very high risk.
BRI Score Chart — Complete Category Table
The table below covers all BRI score ranges with their health implications. These categories apply to all adults and are based on the original BRI research paper published in Obesity (Thomas et al., 2013).
| BRI Score | Category | Color | Health Implication |
|---|---|---|---|
| < 1 | Extremely lean | Very low body fat — potential undernourishment; consult a doctor if accompanied by fatigue or weakness | |
| 1.0 – 3.41 | Lean | Below-average body fat; healthy for most adults, especially those who are physically active | |
| 3.41 – 4.45 | Normal | Healthy body fat distribution; low visceral fat burden; associated with optimal cardiometabolic health | |
| 4.45 – 5.46 | Slightly elevated | Moderate visceral fat accumulation — monitor diet, increase physical activity; common in adults over 45 | |
| 5.46 – 6.91 | Elevated | Elevated visceral fat — increased risk of type 2 diabetes, hypertension, and metabolic syndrome | |
| 6.91 – 9.0 | High | High visceral fat — significant cardiovascular and diabetes risk; clinical intervention recommended | |
| > 9.0 | Very high | Very high cardiometabolic risk — consult a healthcare professional urgently |
BRI Chart by Gender — Men vs Women
While the BRI formula is the same for both sexes, the healthy interpretation differs due to differences in body fat distribution. Women naturally carry more subcutaneous fat and tend to have higher BRI values at equivalent health status. Age amplifies this gap as estrogen declines during menopause.
Men — Healthy BRI by Age
| Age | Healthy Range |
|---|---|
| 20s–30s | 2.5 – 4.2 |
| 40s | 2.8 – 4.6 |
| 50s | 3.2 – 5.0 |
| 60s+ | 3.6 – 5.5 |
Women — Healthy BRI by Age
| Age | Healthy Range |
|---|---|
| 20s–30s | 2.8 – 4.5 |
| 40s | 3.2 – 5.0 |
| 50s | 3.8 – 5.5 |
| 60s+ | 4.2 – 6.0 |
Full age-specific BRI guide with context → | BRI Calculator for Women →
What Does Each BRI Score Mean?
A BRI below 1 is extremely rare in adults. It indicates a very low waist circumference relative to height, suggesting very low body fat. While not inherently dangerous, it can signal undernourishment or muscle wasting in older adults. If you score here without being a competitive athlete, consult a doctor.
Lean BRI is typical among young, active adults and endurance athletes. Visceral fat is minimal. This range is healthy and associated with low cardiometabolic risk. For people in their 30s this is an excellent score.
The "normal" zone reflects healthy body fat distribution for the general adult population. Visceral fat is within a safe range. Most healthy adults in their 30s and 40s who exercise regularly land here. This is the target range for most people.
Slightly elevated BRI indicates moderate abdominal fat accumulation. This range is increasingly common in midlife adults (especially women post-menopause) and is not immediately alarming, but it warrants attention to diet, exercise, and metabolic markers like blood pressure and fasting glucose.
Elevated BRI carries meaningful health risk. Research consistently links BRI scores in this range to significantly higher rates of type 2 diabetes, hypertension, and metabolic syndrome. Diet and lifestyle intervention is strongly recommended. How to lower your BRI →
High BRI is associated with substantial cardiovascular risk, elevated triglycerides, insulin resistance, and increased likelihood of non-alcoholic fatty liver disease (NAFLD). Clinical assessment and medically supervised lifestyle changes are recommended at this level.
Very high BRI scores are rare and represent very high cardiometabolic risk. Medical consultation is urgently warranted. Research shows that BRI scores above 9 are associated with dramatically elevated rates of diabetes, cardiovascular events, and all-cause mortality.
How BRI Is Calculated
BRI is derived from a geometric model that treats the body as an ellipse. It requires only two measurements: waist circumference and height (no weight needed).
BRI = 364.2 − 365.5 × √(1 − ((waist / 2π)² / (0.5 × height)²))
Where waist and height are in the same unit (meters). A higher waist circumference relative to height = higher BRI = more abdominal fat.
Full step-by-step BRI calculation guide with worked examples →
Use the free BRI calculator — no manual calculation needed →
BRI Chart vs BMI Chart — Key Differences
| BRI Chart | BMI Chart | |
|---|---|---|
| Inputs | Waist circumference + height | Weight + height |
| Detects fat location | Yes — waist circumference reflects abdominal fat directly | No — cannot distinguish fat distribution |
| Healthy range | BRI 3.41–4.45 (varies by age and sex) | BMI 18.5–24.9 (same for all adults) |
| Limitation | Requires accurate waist measurement; not for pregnant women | Misclassifies muscular individuals; ignores fat distribution |
| Best use | Cardiometabolic risk assessment, especially in midlife | Quick population screening; still widely used clinically |
BRI Chart — Frequently Asked Questions
A BRI between 3.41 and 4.45 is considered healthy for most adults. This range corresponds to a normal body fat distribution with low visceral fat. For adults over 50, especially postmenopausal women, slightly higher scores (up to 5.5) may be within normal range.
For women in their 30s, a BRI of 2.8–4.5 is healthy. In the 40s, 3.2–5.0 is typical. After menopause (50s+), 3.8–5.5 is the expected range due to hormonal fat redistribution. A BRI consistently above 6.0 at any age warrants medical attention. See our BRI calculator specifically for women →
Calculate your BRI using our free calculator, then find your score on the chart above. Lower scores (below 4.45) indicate lean to normal body fat distribution. Scores between 4.45 and 5.46 are slightly elevated, 5.46–6.91 are elevated risk, and above 6.91 indicates high cardiometabolic risk. Always interpret your score in the context of your age and sex using the male/female tables above.
Standard BRI charts are developed for adults. BRI research in children and adolescents is more limited, and the interpretation differs significantly. Age-specific percentile data is needed for children. Learn about BRI in children →
BRI scores above 5.46 are associated with elevated cardiometabolic risk. Scores above 6.91 carry significant cardiovascular disease risk. A landmark analysis in JAMA Network Open found that BRI scores in midlife are strongly predictive of cardiovascular events 10–15 years later. BRI and heart disease risk research →
The underlying BRI categories (normal, elevated, high) don't change, but the typical range for healthy adults shifts upward with age. A score of 4.8 might be slightly elevated for a 30-year-old but within the expected range for a 55-year-old woman. This is why age-adjusted interpretation (using the tables above) gives the most meaningful picture. Full BRI by age guide →
Calculate Your BRI Now
Use our free calculator to get your exact BRI score and see where you fall on this chart instantly.
Free BRI Calculator →Related: BRI for Women | How to Lower BRI | BRI vs BMI | BRI by Age