Body Mass Index (BMI)



What is Body Composition?
Body composition can have a direct impact on your health, athletic performance and even life expectancy. The national institutes of health (NIH) states: "Evidence is now overwhelming that obesity, the excessive storage of fat , has an adverse effect on health and longevity". Obesity is clearly associated with heart disease, stroke, hypertension,diabetes, and certain forms of cancer and other medical problems.

Body composition can also have a direct impact on athletic performance. Body fat content must be low enough to achieve peak performance, yet high enough to reduce the risk of injury.


It's not the weight it's the fat!
Body fat percentage is more a accurate way to measure your level of fitness. Weight loss alone (without exercise) can actually decrease your lean mass and increase your body fat level. You may be lighter and smaller, but actually be "fatter".

By tracking body fat percentage, you can ensure that you will effectively meet your fitness requirements.

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Body Fat percentage
A minimum amount of body fat is crucial to the human body to cushion and protect body organs from injury. Fat serves the important function of storing and releasing energy and vitamins when needed.

However, too much or to little body fat can cause serious health risks. The table at the bottom of this page provides the optimum body fat percentage for your age and gender.

Lean Body Mass
All parts of the body exclusive of body fat — bones, organs, muscle, connective tissue, fluids — make up your lean body mass. the higher the percentage of lean body mass, the more muscular and with higher bone density. A more muscular body is normally considered attractive and improves athletic performance.


Total Body Water
Total body water is the estimated amount of water in your body. Great care should be taken during diet and exercise to avoid becoming dehydrated. Optimal water content for women is approximately 55% – 60% The optimal range for men is approximately 60% – 65%.

Body fat percentage

Men Under age 30 Age 30-39 Age 40-49 Age 50-59 Over Age 60
Excellent Up-to 11.8% Up-to 15.9% Up-to 18.1% Up-to 19.8% Up-to 20.3%
Good 11.9-15.9% 16.0-19.0% 18.2-21.1% 19.9-22.7% 20.3-23.5%
Fair 16.00-19.5% 19.1-22.3% 21.2-24.1% 22.8-25.7% 23.6-26.7%
Needs Improvement Over 19.5% Over 22.3% Over 24.1% Over 25.7% Over 26.7%
Women Under age 30 Age 30-39 Age 40-49 Age 50-59 Over Age 60
Excellent Up-to 19.0% Up-to 20.0% Up-to 23.5% Up-to 26.5% Up-to 25.7%
Good 19.1-22.1% 20.1-23.1% 23.6-26.4% 26.7-30.1% 27.6-30.9%
Fair 22.2-25.4% 23.2-27.0% 26.5-30.1% 30.5-33.5% 31.0-34.3%
Needs Improvement Over 25.0% Over 27.1% Over 30.2% Over 33.6% Over 34.4%


How is BMI determined? BMI can be determined by using the following equation:
Body weight (in pounds) x Height (in inches)


HeightWeight in pounds
4' 10" (58in) 91 96 100 105 110 115 119 124 129 134 138 143 148 153 158 162 167
4' 11" (59in) 94 99 104 109 114 119 124 128 133 138 143 148 153 158 163 168 173
5' (60in) 97102 107 112 118 123 128 133 138 143 148 153 158 163 168 174 179
5' 1" (61in) 100 106 111 116 122 127 132 137 143 148 153 158 164 169 174 180 185
5' 2" (62in) 104 109 115 120 126 131 136 142 147 153 158 164 169 175 180 186 191
5' 3" (63in) 107 113 118 124 130 135 141 146 152 158 163 169 175 180 186 191 197
5' 4" (64in) 110 116 122 128 134 140 145 151 157 163 169 174 180 186 192 197 204
5' 5" (65in) 114 120 126 132 138 144 150 156 162 168 174 180 186 192 198 204 210
5' 6" (66in) 118 124 130 136 142 148 155 161 167 173 179 186 192 198 204 210 216
5' 7" (67in) 121 127 134 140 146 153 159 166 172 178 185 191 198 204 211 217 223
5' 8" (68in) 125 131 138 144 151 158 164 171 177 184 190 197 203 210 216 223 230
5' 9" (69in) 128 135 142 149 155 162 169 176 182 189 196 203 209 216 223 230 236
5' 10" (70in) 132 139 146 153 160 167 174 181 188 195 202 209 216 222 229 236 243
5' 11" (71in) 136 143 150 157 165 172 179 186 193 200 208 215 222 229 236 243 250
6' (72in) 140 147 154 162 169 177 184 191 199 206 213 221 228 235 242 250 258
6' 1" (73in) 144 151 159 166 174 182 189 197 204 212 219 227 235 242 250 257 265
6' 2" (74in) 148 155 163 171 179 186 194 202 210 218 225 233 241 249 256 264 272
6' 3" (75in) 152 160 168 176 184 192 200 208 216 224 232 240 248 256 264 272 279
BMI 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35


Use this chart to find your Height and weight to determine your body mass index (BMI)
For more information about BMI, weight, nutrition, and health visit the following web sites:

American Dietetic Association

American Heart Association

NIH/National Heart, Lung, and Blood Institute

NIH/National Institutes of Diabetes & Digestive & Kidney Diseases



Joe A
Date of test: Nov 10 2009
Age: 51
Sex: Male
Current weight (lbs): 200
Body frame: Large
Height (inches):70
Exercise frequency: 5-6 times per week
Exercise intensity: Moderately heavy
Exercise time: over 30 minutes

Body Fat: 10.4%

fat weight: 20.8 lbs
Lean (fat Free) weight: 179.2 lbs
Total body water: 60.5 liters or 66.7%
Body mass Index: 28.7

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Body Mass Index (BMI)

Body mass index (BMI) is a relation between weight and height that is often associated with health risks.

Note: these guideline do not take into account muscle mass.

The centers for disease control uses the following guidelines.

Rating Body mass index (BMI)
Underweight Less than 18.5
Ideal 18.6 - 24.9
Overweight 25.0 - 29.9
Obese 30.0 - Over

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