BMI CalculationsWhy BMI is NOT a good
indicator for overall health

BMI = ( 
Your weight in pounds (Height) x (Height) 
) x 703 
Using the Metric system to calculate BMI
*Note: weight in kilograms and height in meters or centimeters
BMI = ( 
Your weight in Kilograms (Height) x (Height ) 
) x 10,000 
Using the BMI chart below you can get a good understanding of what
the calculations mean. The list below is broken down into four
categories: underweight, normal, overweight and obese.
BMI Caculation  Results  
Below 18.5  Underweight  
18.5  24.9  Normal  
25  29.9  Overweight  
30 and Above  Obese 
Why the BMI index does not work
Let’s use an example where two people who are
5’ 8” and weigh 220 pounds. The first person in our example has a body fat
percentage of 33% while the second one is a bodybuilder with a body fat
percentage of 7%. The first person in our example, we will call him John, is
carrying a lean body weight around 174 pounds thus carrying about 72 pounds
of fat. Our bodybuilder in the example, who will refer to as Matt, has a
lean body weight around 204 pounds carrying about 16 pounds of fat. Now
let’s look at the BMI calculations for both of our examples.
Since both of our guys are the same height and weight there is only one
formula to use to calculate their BMI. Even though both of them have
drastically different body fat percentages they both receive a BMI score of
33.4. Now a BMI over 30 is considered obese and here is where the problem
lies. John is definitely obese and the BMI score gives a pretty accurate
result for his health. However, Matt is by far not obese and his BMI score
is grossly wrong in its calculations.
As you can see a BMI calculation cannot be used for everyone. BMI is
just not a good indicator for someone’s health and should be avoided when
making any health assumptions. Although the BMI calculations are fairly
accurate for someone who lives a sedentary lifestyle, the calculations
really should be avoided by anyone with a muscular physique. The best
recommendation for getting a good indicator of your health is to invest in
something that actually tracks your body fat percentage. Although this is
not the “end all be all” indicator for overall health it will give you a
good idea of where you are at. There are a variety of different calipers,
body fat calculators and analyzers available that will help you get a good
understanding on your estimated body fat percentage. You can learn more
about the different
body fat
monitors available at
www.one4fitness.com.