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How To Calculate Your BMI

So what does BMI actually mean?

BMI, or the body mass index, is a tool thats used to determine whether or not a person is at a normal weight for his or her height.  It was invented between 1830 and 1850 by mathematician and scientist Adolphe Quetelet.  Though its been almost 200 years since he created the BMI, its used today almost exactly as he outlined.

While BMI isnt the final word in whether or not someone is at a normal weight, its one of the first tools often used to determine if someones overweight.  Because the BMI doesnt distinguish between weight from fat and weight from muscle (other tools must be used to determine the actual amount of fat) it doesnt work well for very muscular people like athletes.

It also does not take in the affect of different size body frames.

But for most of us, BMI is a pretty accurate measure of whether were underweight, a normal weight, overweight or obese.

There will be 2 methods shown here; one for meters and kgs and one for inches and pounds.

Calculating BMI isnt difficult once you understand the formula.  The basic formula is weight divided by height squared, or kg/m2. Sounds confusing doesnt it?

You simply take your height in meters and square it which means you take the number of meters times itself.  Then divide that number into your weight in kilograms.  So a person whos five-and-a-half-feet tall stands about 1.7 meters.  To get 1.7 meters squared, you simply multiply 1.7 times 1.7, which equals 2.89.  Now, convert weight to kilograms.

So if someone weigh 200 pounds, thats about 91 kilograms.  To determine the BMI of someone about five-and-a-half-feet tall who weights 200 pounds, or who stands 1.7 meters tall who weights 91 kilograms, we divide the weight by the height squared, or 91 divided by 2.89.  That gives us the result of about 31.  This individual is classified as obese.  How do I know that?

A BMI of 18.5 or below indicates an underweight person. The normal weight range is from 18.5 to 24.9. Overweight people will have a BMI of 25 to 29.9.  A BMI of 30 or greater indicates obesity. So a person with a BMI of 31 is in the obese range, but not by much.

Take your height in inches and square it. That is take your height in inches and times this number by  your height in inches. For example: if you are 5 feet 7 inches you would take 67 inches (that 60 inches for the 5 feet and add the 7 inches) and times that by 67 inches (67 x67 = 4489)

Now take your weight in pounds and divide that by your squared height. Example: 185 pounds    Take 185 pounds and divide by 4489 which equals .041 and multiply this by 703 = your BMI

.041  times  703 = 28%

While it may seem complicated the first time that you do it, you will only need to check every few months, so it really isnt a big deal. You will also find that once you calculate your BMI once, you will realize that it really is easy to do.

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This entry was posted on Thursday, August 25th, 2011 and is filed under Healthy Food Consultant. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
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