Body Adiposity Index (BAI) Calculator
Estimate body fat percentage from hip circumference and height
BAI is calculated as ((hip / height^1.5) - 18). All calculations run locally in your browser.Input details
Results
--Body Adiposity Index
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Reference age bracket
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BAI range position
Scale 0% - 60%
0%60% (chart max)
Reference Data: Body Adiposity Index (BAI) by Age and Sex
Men - Reference ranges by age
| Age (years) | Underfat | Healthy | Overweight | Obese |
|---|---|---|---|---|
| 20 - 39 | < 8 | 8 - 20 | 21 - 25 | > 25 |
| 40 - 59 | < 11 | 11 - 22 | 23 - 27 | > 27 |
| 60 - 79 | < 13 | 13 - 25 | 26 - 30 | > 30 |
Women - Reference ranges by age
| Age (years) | Underfat | Healthy | Overweight | Obese |
|---|---|---|---|---|
| 20 - 39 | < 21 | 21 - 32 | 33 - 38 | > 38 |
| 40 - 59 | < 23 | 23 - 33 | 34 - 39 | > 39 |
| 60 - 79 | < 24 | 24 - 35 | 36 - 41 | > 41 |
Notes and Considerations
- Healthy range (Men): 8-21%.
- Healthy range (Women): 21-33%.
- Cutoffs differ by sex because women naturally have more body fat.
- Originally validated in Mexican-American and African-American adults; values may vary in other ethnic groups.
- Best for ages 20-79; less accurate for children, teens, or elderly users.
- Advantage: no body weight scale required, only hip and height.
- Limitation: less accurate than DEXA or BMI plus waist; may misclassify very lean or very muscular individuals.