Body measurements Health Calculators

Body Adiposity Index (BAI)

BAI Calculator – Body Adiposity Index

BAI calculator is an excellent tool for all people who want to keep their bodies healthy and fit. With its help, you will check your body adiposity index and, thanks to the guideline table below, you will find if your BAI is within a healthy body fat level.

The body adiposity index (BAI) is a method of estimating the amount of body fat in humans. The BAI is calculated without using body weight, unlike the body mass index (BMI). Instead, it uses the size of the hips compared to the person’s height.

Based on population studies, the BAI is approximately equal to the percentage of body fat for adult men and women of differing ethnicities.

BAI calculator

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

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


  • hip circumference – is in centimeters
  • 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, that it goes through the rise of the buttocks (viewed from the side).


The BAI could be a good tool to measure adiposity due, at least in part, to the advantages over other more complex mechanical or electrical systems. Probably, the most important advantage of BAI over BMI is that weight is not needed. However, in general it seems that the BAI does not overcome the limitations of BMI.

Stated advantages of the BAI are that it approximates body fat percentage, while the widely used BMI is known to be of limited accuracy, and is different for males and females with similar percentage body adiposity; and that it does not involve weighing, so can be used in remote locations with limited access to scales. A detailed study published in 2012 concluded that estimates of body fat percentage based on BAI were not more accurate than those based on BMI, waist circumference, or hip circumference.

Adiposity indexes that include the waist circumference (for example waist-to-height ratio WHtR) may be better than BAI and BMI in evaluating metabolic and cardiovascular risk in both clinical practice and research.

Healthy body fat

Once you know your body adiposity index, check the tables below to determine whether you are a healthy weight or not.

  • Body adiposity index classification for woman
Age (years) Underweight Healthy Overweight Obese
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) Underweight Healthy Overweight Obese
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%

If you think your BAI is too high and you’re looking for a tool to help you lose weight, check the BMR calculator – it will tell you, how many calories your body burns a day so that you know your limit.

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