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BAI Calculator - Body Adiposity Index

Table of contents

What is BAI?BAI calculatorCalculate the body fat percentageHealthy body fat

The BAI calculator is a tool for anyone who wants to keep their body healthy and fit. With its help, you will check your body adiposity index. Read the supporting article to study what BAI is, how to calculate body fat percentage, and see the ranges for underweight, healthy, overweight, and obese.

We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace a professional doctor's assessment. All information on this website is for informational purposes only and is not intended to serve as a substitute for medical consultation. Always consult your results with a health care provider.

What is BAI?

BAI is an abbreviation of body adiposity index. This parameter defines your total body mass, which is made only of fat tissues. The calculations are based on a comparison of the person's height to hip size. Unlike the body mass index (BMI), the BAI method doesn't use body weight for estimations. Several studies on population show that the BAI is approximately equal to the body fat percentage for adult men and women of differing ethnicities.

According to the researchers' scientific study, the BAI methods of adiposity calculations have similar accuracy to BMI, waist, or hip circumference-based approaches. Learn more about this in our waist to hip ratio calculator. However, none of these techniques (including BAI) offer precise measures of body fat. They are used mainly for basic testing because they are easy to perform and inexpensive.

BAI calculator

The body adiposity calculator provides you with the percentage value of body fat, covered in our army body fat calculator. For calculations, it uses the formula (for both males and females):

BAI = (hip circumference/(height)^1.5) - 18

where: hip circumference is in centimeters and height is in meters.

Calculating the body adiposity index, divide your hip circumference (in cm) by your height (in m) raised to the power of 1.5, and then subtract 18.

What is essential the measurements of hip circumference should be made by placing a tape measure around the hips so that it goes through the rise of the buttocks (viewed from the side).

Calculate the body fat percentage

Using the BAI calculator is a piece of cake. Take a look:

  1. Fill in your height (you can use different units like cm, m, in, ft)
  2. Enter your hip circumference (in cm or in)
  3. Check the percentage value of the body adiposity index in the last field.

Let's do an example calculation for a man who is 42 years old:

height = 180 cm

hip circumference = 102 cm

The result:

BAI = 24.2%

Now, find this value in the table below - it seems our friend is slightly overweight.

Healthy body fat

Once you know your body adiposity index, check the tables below to interpret the result. BAI classification depends on age and gender were proposed by Gallagher, Heymsfield et al.:

  • Body adiposity index classification for woman

Age (years)





20 - 39

Less than 21%

21% to 33%

Greater than 33%

Greater than 39%

40 - 59

Less than 23%

23% to 35%

Greater than 35%

Greater than 41%

60 - 79

Less than 25%

25% to 38%

Greater than 38%

Greater than 43%

  • Body adiposity index classification for man

Age (years)





20 - 39

Less than 8%

8% to 21%

Greater than 21%

Greater than 26%

40 - 59

Less than 11%

11% to 23%

Greater than 23%

Greater than 29%

60 - 79

Less than 13%

13% to 25%

Greater than 25%

Greater than 31%

Check the Harris-Benedict calculator – it will tell you how many calories your body burns a day, as a basal metabolic rate.

Remember that although the BAI index may be a promising alternative to the BMI, it also has many drawbacks. It shouldn't be interpreted separately from other body measurements and overall health assessments by a medical professional.

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