widest point of the buttocks
0 % body fat (BAI)
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Category
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Healthy range
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Hip circumference
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Height
The Body Adiposity Index estimates body-fat percentage from hip size and height — without needing body weight — using BAI = (hip cm ÷ height m1.5) − 18. It is an estimate; methods like skinfolds, DEXA or bioimpedance are more precise.
Frequently Asked Questions
What is the Body Adiposity Index?
BAI is a way to estimate the percentage of body fat using only hip circumference and height, with the formula BAI = (hip in cm ÷ height in metres^1.5) − 18. Unlike BMI it does not need your weight.
How accurate is BAI?
BAI gives a reasonable population-level estimate but can be off for very lean or very muscular individuals. For clinical accuracy, methods such as DEXA scans, skinfold calipers or bioelectrical impedance are preferred.
What body-fat percentage is healthy?
Broadly, a healthy range is about 14–24% for men and 21–31% for women, varying with age. Above roughly 25% (men) or 32% (women) is generally considered obese.
Estimate your body-fat percentage using the Body Adiposity Index (BAI) from your hip circumference and height — no weight needed.