What is BAI?
BAI is an abbreviation of body adiposity index. This parameter defines your total body mass that is made only of fat tissues. The calculations are based on a comparison of the person's height to the hips size. Unlike the BMI calculator, the BAI method doesn't use body weight for estimations. Several studies on population show that the BAI is approximately equal to the percentage of body fat 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. 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.
The body adiposity calculator provides you with the percentage value of body fat. For calculating, it uses the below formula (for both, males and females):
BAI = (hip circumference/(height)^1.5) - 18
hip circumference is in centimeters and
height is in meters.
Measuring 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).
Calculate the body fat percentage
Using the BAI calculator is a piece of cake, take a look:
- Fill in your height (you can use different units like cm, m, in, ft)
- Enter your hip circumference (in cm or in)
- Check the percentage value of body adiposity index in the last field.
Let's do an example calculation for a middle-aged man who is 41 years old:
height = 179 cm
hip circumference = 102 cm
and the result:
BAI = 24.59%
Now, find this value in the table below - it seems that our guy is a little bit overweight.
Healthy body fat
Once you know your body adiposity index, check the tables below to determine whether you are a healthy weight or not. BAI classification depends on age and gender were proposed by Gallagher, Heymsfield et al.:
- Body adiposity index classification for woman
|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
|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%|
Advantages of the BAI method
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.