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How to calculate Body Fat Index using this tool?

• The calculation for Body Adiposity or Fat Index is dependent on your height and hip measurements.
• First, select the unit for height - either feet and inches or meter. Enter your height in the field labelled as Your height
• Select the unit for Hip measurement. You can enter the hip measurement in inches or centimeter
• Select Age Group and Gender . Both are optional.
• Click on the Calculate button. Your BAI score is displayed in %.
• Refer the Classification chart to find out if it's healthy, overweight , underweight or obese range
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Formula to calculate Body Adiposity Index

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

hip circumference is in centimeters and height is in meters.

You can measure your hip circumference using a measuring tape

Wrap it around the largest portion of the hip while in standing position

Note it down in cm or inches. In above formula, convert to centimeter if you have measured in inches

BAI classification for women:

Age(years)UnderweightHealthyOverweightObese
20-39 < 21%21% to 33%> 33%> 39%
40-59 < 23%23% to 35%> 35%> 41%
60-79 < 25%25% to 38%> 38%> 43%

BAI classification for men:

Age(years)UnderweightHealthyOverweightObese
20-39 < 8%8% to 21%> 21%> 26%
40-59 < 11%11% to 23%> 23%> 29%
60-79 < 13%13% to 25%> 25%> 31%

• Body Adiposity Index or BAI in short is a measure of the amount of body fat in humans. It is expressed in Percentage.
• Adipose also means Fat. We can also refer to this measure as Body Fat Index.
• The fat cells are stored in adipose tissue
• BAI formula is based on hip measurement and height derived based on experiments and research
• BAI value is used as an estimate to determine if a person is in normal, underweight, overweight or obese range
• BAI Range varies based on age group and gender

Recommended BAI Table for Men and Women covering Age Groups 20 to 39 years

Note: This is computed based on what is considered as Normal BAI score for Men (8% - 21%) and for Women (21% to 33%) for Age group of 20 to 39 years.

Height (ft-in / cms)Height (cm / m)Hip Range (cm) MaleHip Range (in) MaleHip Range (cm) FemaleHip Range (in) Female
4 ft 10 in / 58 in 147 cm / 1.47 m47 cm - 70 cm 18 in - 28 in70 cm - 92 cm27.5 in - 36 in
4 ft 11 in / 59 in 150 cm / 1.5 m48 cm - 72 cm 19 in - 28 in72 cm - 94 cm28 in - 37 in
5 ft / 60 in 152 cm / 1.52 m49 cm - 74 cm 19.2 in - 29 in74 cm - 96 cm 29 in - 38 in
5 ft 1 in / 61 in 155 cm / 1.55 m51 cm - 76 cm 20 in - 30 in76 cm - 99 cm30 in - 39 in
5 ft 2 in / 62 in 157 cm / 1.57 m52 cm - 78 cm 20.4 in - 31 in77.1 cm - 101 cm30.4 in - 40 in
5 ft 3 in / 63 in 160 cm / 1.6 m53 cm - 79 cm 21 in - 31.1 in79 cm - 104 cm31 in - 41 in
5 ft 4 in / 64 in 163 cm / 1.63 m54 cm - 81 cm 21.2 in - 32 in81 cm - 106 cm32 in - 42 in
5 ft 5 in / 65 in 165 cm / 1.65 m56 cm - 83 cm 22 in - 33 in83 cm - 109 cm33 in - 43 in
5 ft 6 in / 66 in 168 cm / 1.68 m57 cm - 85 cm22.4 in - 33.485 cm - 111 cm33.4 in - 43.7
5 ft 7 in / 67 in 170 cm / 1.7 m58 cm - 87 cm 23 in - 34 in87 cm - 114 cm 34 in - 45 in
5 ft 8 in / 68 in 173 cm / 1.73 m60 cm - 89 cm23.6 in - 35 in89 cm - 116 cm35 in - 46 in
5 ft 9 in / 69 in 175 cm / 1.75 m61 cm - 91 cm24 in - 36 in91 cm - 119 cm36 in - 47 in
5 ft 10 in / 70 in 178 cm / 1.78 m62 cm - 93 cm24.4 in -37 in93 cm - 121 cm37 in - 48 in
5 ft 11 in / 71 in 180 cm / 1.8 m63 cm - 95 cm25 in - 37.4 in95 cm - 124 cm37.4 in - 49 in
6 ft / 72 in 183 cm / 1.83 m65 cm - 97 cm25.5 in - 38 in97 cm - 127 cm38 in - 50 in
6 ft 1 in / 73 in 185 cm / 1.85 m66 cm - 99 cm26 in - 39 in99 cm - 129 cm39 in - 51 in
6 ft 2 in / 74 in 188 cm / 1.88 m67 cm - 101 cm26.3 in - 40 in101 cm - 132 cm 40 in - 52 in
6 ft 3 in / 75 in 191 cm / 1.91 m69 cm - 103 cm27 in - 40.5 in103 cm - 135 cm41 in - 53 in
6 ft 4 in / 76 in 193 cm / 1.93 m70 cm - 105 cm 27.5 in - 41 in105 cm - 137 cm41.3 in - 54 in
6 ft 5 in / 77 in 196 cm / 1.96 m71.1 cm - 107 cm28 in - 42 in107 cm - 140 cm42 in - 55 in
6 ft 6 in / 78 in 198 cm / 1.98 m73 cm - 109 cm 28.7 in - 43 in109 cm - 143 cm43 in - 56 in
6 ft 7 in / 79 in 201 cm / 2 m74 cm - 111 cm 29 in - 43.7111 cm - 145 cm 43.7 in - 57 in
6 ft 8 in / 80 in 203 cm / 2.03 m76 cm - 113 cm 30 in - 44 in113 cm - 148 cm44 in - 58 in
6 ft 9 in / 81 in 206 cm / 2.06 m77 cm - 116 cm30.3 in - 45 in116 cm - 151 cm46 in - 59 in
6 ft 10 in / 82 in 208 cm / 2.08 m79 cm - 118 cm 31 in - 46 in118 cm - 154 cm46.4 in - 61 in
6 ft 11 in / 83 in 211 cm / 2.1 m80 cm - 120 cm 31.4 in - 47 in120 cm - 157 cm47 in - 62 in

What are the different methods to measure Body Fat?

There are 4 methods that have a relation to body fat measurement. These are

• Body Mass Index (BMI) - height and weight
• Body Adiposity Index (BAI) - height and hip
• Relative Fat Mass (RFM) - height and waist
• Waist to Hip Ratio (WHR) - waist and hip
• Body Mass Index (BMI) gives a measure of body fat based on height and weight measurements. However, it does not distinguish between muscle mass and fat leading to some inaccuracies.
• Body Adiposity Index (BAI) was evolved to improve upon BMI. BAI uses hip measurement instead of weight and height. The classification of BAI ranges is also based on gender and age and not generic as in BMI
• Relative Fat Mass (RFM) uses waist and height measurements to estimate body fat %.
• It gives a better measure of fat around the organs which is a key indicator of health risk. RFM has separate classification for men and women. It does not distinguish with age groups and has a common classification across all of them.
• Waist to Hip Ratio (WHR) is more an indicator of body shape based on fat distribution. It classifies the shapes as Pear, Avocado and Apple and corresponding health risk for each. The ranges and classification are based on gender

• For Women ,
20-39 - 21% to 33%
40-59 - 23% to 35%
60-79 - 25% to 38%
For Men ,
20-39 - 8% to 21%
40-59 - 11% to 23%
60-79 - 13% to 25%

• BAI can be measured with a tape in standing position.
Wrap it around the largest part of the hip region for the hip circumference measurement. Note down the value in cms.
For height, stand against a wall, and measure from top part of head to toe in straight position. Convert the cm or inches to meter.
Apply the formula for BAI (hip circumference/(height)^1.5) - 18

• BMI uses body weight to find the fat percentage.
BAI does not use body weight but uses hip circumference to find the BAI.
Both use height as the common parameter.

• They are complementary to each other.
Both have limitations and not the ideal most accurate measure but useful as a rough indicator of body fat percentage.
Since BMI uses weight, it has the drawback of not being able to distinguish between muscle mass weight vs fat weight.
Also BMI does not have age or gender specific classification.
BAI was formulated to address age and gender specific classification.

• Yes, Adipose cells or tissue is referred to as body fat. They store fat as globules.
Fat under the skin is Subcutaneous fat (thigh, hip and those under the skin).
They are also referred as SAT - Subcutaneous Adipose Tissue.
Visceral fat is the fat surrounding liver and other organs and is located deeper inside the body.
They are also referred to as VAT - Visceral Adipose Tissue.