📐 BAI Calculator – Body Adiposity Index
Estimate your Body Adiposity Index (BAI), a body fat percentage estimate based only on your hip circumference and height, no weight needed.
What BAI measures
Body Adiposity Index (BAI) estimates body fat percentage using only hip circumference and height, without needing a bathroom scale. It was developed as an alternative to BMI for estimating adiposity (body fat) directly.
How this calculator works
Enter your hip circumference and height. The calculator applies the standard BAI formula: hip circumference in centimeters, divided by height in meters raised to the power of 1.5, minus 18. The result is expressed as an estimated body fat percentage.
BAI tends to be less accurate for very tall, very short, or highly muscular individuals, and its accuracy can also vary by age, sex, and ethnicity. This tool is for general educational and planning purposes only and is not a substitute for professional medical advice or a clinical body composition test.