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Body Adiposity Index Calculator

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image of a woman measuring her hips with a tape measure

This body adiposity index (BAI) calculator determines your body fat percentage (it could also be called a percentage body fat calculator because your body adiposity index and your body fat percentage represent the same thing). Your body adiposity index is a measure of the percentage of your total body mass that is composed of fat (as opposed to fat-free mass which includes everything else other than fat that makes up the body). When using this calculator it is important to keep in mind that, although most people are typically concerned that their body adiposity index may be too high, it can also be unhealthy to have a body adiposity index that is too low. A body adiposity index classification table, displayed below the calculator, provides a guideline for what body adiposity ranges are considered to be underweight, healthy, overweight, and obese.

Body Adiposity Index Calculator

Hip Circumference

Note: Hip circumference measurements should be made by placing tape measure around the hips so that it passes over the greatest protrustion of the buttocks as viewed from the side.

Height

Body adiposity index classification ranges for men and women, as outlined by Gallagher et al., are shown in the table below.

Body Adiposity Index Classifications for Women
Age (years)UnderweightHealthyOverweightObese
20 - 39Less than 21%21% to 33%Greater than 33%Greater than 39%
40 - 59Less than 23%23% to 35%Greater than 35%Greater than 41%
60 - 79Less than 25%25% to 38%Greater than 38%Greater than 43%
Body Adiposity Index Classifications for Men
Age (years)UnderweightHealthyOverweightObese
20 - 39Less than 8%8% to 21%Greater than 21%Greater than 26%
40 - 59Less than 11%11% to 23%Greater than 23%Greater than 29%
60 - 79Less than 13%13% to 25%Greater than 25%Greater than 31%

Equations

The equations used by this calculator to determine your body adiposity index are shown below.

where

BAI = Body Adiposity Index
HM = Height in Metres
HC = Hip Circumference in Centimetres

Colombo O, Villani S, Pinelli G, Trentani C, Baldi M, Tomarchio O, Tagliabue A. To treat or not to treat: comparison of different criteria used to determine whether weight loss is to be recommended. Nutr J. 2008 Jan 29;7:5.

Gallagher D, Heymsfield SB, Heo M, Jebb SA, Murgatroyd PR, Sakamoto Y. Healthy percentage body fat ranges: an approach for developing guidelines based on body mass index. Am J Clin Nutr. 2000 Sep;72(3):694-701.

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