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Updated on January 7, 2010

Let's Begin

Gender and age are considered when calculating the BMI (Body Mass Index) for a teenager. Age is considered because the body fat content changes with age, gender because the amount of body fat differs between genders.

You will need to obtain accurate weight and height measurements from the teen being measured for BMI. The easiest way to proceed is to consult an online BMI calculator. The Center for Disease Control offers one, here: If you want to do the math yourself, however, here are the steps you need.



First - Weight
First - Weight

1) First, weigh your subject. Let's pretend we have we have a female teen of 110 pounds.

2) Next - Height
2) Next - Height

2) Second, measure his/her height. Let's say our teen is 5'2", or 62 inches. Now we'll have to square that (multiply it by itself). 62 squared is 3844.


Now-Do your calculations
Now-Do your calculations

Now Calculate-

3) Now we will divide our teen's  weight (in pounds) - 110, by her height (in inches, squared) - 3,844. This equals a rounded 0.029.

4) Take 0.029 (our teens weight divided by her squared height) and multiply it by 703. 703 is the conversion factor we use to calculate BMI. (Unfortunately I was not able to discover what makes 703 the magic number!) This gives us 20.3.

Find a BMI graph
Find a BMI graph


5) Consult a reputable site containing a BMI graph and BMI guidelines appropriate for your Teen's age and weight. A couple are listed below. General guidelines according to the Dietary Guidelines Advisory Committee are: BMI from 18.5 to 25 - Healthy, BMI from 25 to 30 - Overweight, BMI over 30 - Obese (This one does everythingfor you! - well you do have to have your own scale and measuring tape!)

Don't Panic!
Don't Panic!

Don't Panic!

Take Note! A BMI that is considered "unhealthy" can always be changed! .BMI is merely an indicator of health. You  can use it to help you work on changing your life for the better as you add healthy eating habits and exercise into your lifestyle.


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