BAI Calculator
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The body adiposity index estimates body fat percentage without a scale: BAI = hip circumference (cm) ÷ height (m)^1.5 − 18. A 100 cm hip at 1.68 m height gives about 27.9%.
| BAI (estimated body fat) | 27.9% |
| Hip circumference | 100 cm |
| Height | 1.68 m |
| Height^1.5 | 2.178 |
Show steps
- BAI = hip (cm) ÷ height (m)^1.5 − 18 (Bergman et al., 2011).
- = 100 ÷ 1.68^1.5 − 18 = 100 ÷ 2.178 − 18 = 27.9%.
How to measure
Measure your hips around the widest part of the buttocks, standing with feet together, keeping the tape level. Measure height without shoes.
The formula
BAI = hip ÷ height^1.5 − 18 (Bergman et al., 2011), with hip in cm and height in m. Raising height to the power 1.5 makes the index work across body sizes.
Limitations
Later studies found BAI less accurate than BMI-based or bioimpedance estimates in some groups, and it can overestimate fat in men and lean people. Use it as a rough guide.
BAI Calculator quiz: 10 questions
Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.
Quiz complete
Frequently asked questions
What is a healthy BAI?
Interpret it like body fat %: roughly 8 to 20% for men and 21 to 33% for women are common healthy ranges, depending on age.
Why no weight?
BAI was designed for settings without reliable scales.
Is BAI better than BMI?
Not consistently; each has limits.
Can I use inches?
Yes, switch the units.
Who should not rely on it?
Athletes, children and pregnant women.
Sources
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