This body adiposity index calculator estimates body fat percentage from hip circumference and height, no weight needed. Enter both values above.
Formula
BAI = hip(cm) ÷ height(m)1.5 − 18
Example
Hip 100 cm, height 1.8 m: BAI = 100 ÷ 1.81.5 − 18 = 23.4.
BAI is an alternative to BMI that does not require weight, but it is a rough estimate.
Important
This tool is for general educational purposes only and is not medical advice, diagnosis, or treatment. It does not replace evaluation by a qualified healthcare professional — consult one for any health decision. Last updated: August 2026.
Frequently Asked Questions
What is the body adiposity index?
An estimate of body fat percentage from hip circumference and height, proposed as an alternative to BMI that needs no scale.
How do I calculate BAI?
Divide hip circumference in cm by height in meters to the power 1.5, then subtract 18.
Is BAI better than BMI?
Not clearly. It avoids needing weight but is not consistently more accurate; use it as one of several measures.