Health & Fitness

Body Adiposity Index (BAI) Calculator

Enter your hip circumference and height to estimate body fat with BAI.

By TheCalcTools Updated Formula checked and tested

Your numbers

Your results

Body adiposity index (body fat %)
Body adiposity index (body fat %)
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Body Adiposity Index (BAI) Calculator by TheCalcTools

How the Body Adiposity Index (BAI) Calculator works

BAI estimates body fat percentage directly: hip circumference in centimetres divided by height in metres to the power 1.5, minus 18. It was developed and validated against DXA scans in Mexican-American and African-American adults.

Later studies found BAI is not more accurate than BMI for many groups, especially at the extremes of body fat. Treat it as one estimate among several.

The formula

BAI = hip (cm) ÷ height (m)^1.5 − 18

Worked example

Using the default values shown in the calculator:

Hip circumference100
Height175
  1. 100 ÷ 1.75^1.5 − 18 = 25.2% body fat.

Result:

Body adiposity index (body fat %)25.2

Frequently asked questions

Where do I measure hip circumference?

Around the widest part of the buttocks, with the tape level and snug but not tight.

Sources and further reading

Body Fat CalculatorEstimate your body fat percentage from a tape measure, using the U.S BMI CalculatorCalculate your body mass index (BMI) from your height and weight, see which adult… Waist-to-Hip Ratio CalculatorMeasure your waist and hips to get your ratio A Body Shape Index (ABSI) CalculatorEnter waist, height and weight to calculate your body shape index Ideal Weight CalculatorSee what four classic formulas suggest for your height Healthy Weight Range CalculatorWhat weights fall in the normal BMI range for your height?

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This calculator gives general estimates for information and education. It is not medical advice and does not diagnose anything. Talk to a qualified health professional about your own situation. See our disclaimer.