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BMI Calculators: What is BMI - and How to Calculate Yours)
BMI Basics, including the BMI Formula and BMI Calculators as well
as BMI information for children and teens
You know your body weight, but do you know your BMI?
Your BMI (or Body Mass Index) is a quick way to figure out of if your weight is
on track for your height.
Your BMI is very simple to calculate but keep in mind that it should be used
only as a guideline for healthy weight. Because muscle weighs more than fat,
weight and your BMI are not the only determination of your level of health.
BMI Calculator
Use the BMI Calculator here - or use the formula outlined below.
Your BMI falls within one of four categories: underweight, normal
range, overweight or obese.
Underweight is 18.5 and below
Normal is 18.5 to 24.9
Overweight: 25.0 and 29.9
Obese: 30 and over
The BMI Formula
In order to calculate your BMI just complete the following steps. All you'll
need is yourself, your accurate height, a scale and a calculator.
1. First, weigh yourself. If you normally weigh yourself once
during the day at a specific time you're going to do things a little bit
differently this time. You need to weigh yourself in the morning before you eat
or drink because food and liquids can affect your body weight. Weigh yourself
three times and then take an average of those weights to get an accurate figure.
2. Next, convert your height into inches and then square that figure.
For example, if you are 5'5" your height in inches would be 65 inches. Square
that number (65X65) and then divide your weight in pounds by that figure. If
you're 5 feet, 5 inches tall and weigh 165 pounds, your ending number would be
.03905.
3. The next step is to take that number and multiply it by 703
(see why you need a calculator!) This step will convert the pounds and inches
into the metric system. In our example, .03905 multiplied by 703 is 27.45. This
figure is your BMI and, again, it falls within one of four categories: underweight,
normal range, overweight or obese.
Underweight is 18.5 and below
Normal is 18.5 to 24.9
Overweight: 25.0 and 29.9
Obese: 30 and over
BMI for Children
All adults over 20 years of age can use the BMI chart above.
BMI for children and teens is calculated the same way that it is for
adults, but the results are not determined via a static chart (as above)
but through a comparison with other children of the same age and sex.
If the BMI-for-age is less than the 5th percentile the child is
underweight.
If the BMI-for-age is between the 85th and 95th percentile, the child is
at risk for becoming overweight.
If the BMI-for-age is in the 95th percentile, the child is overweight.
Keep in mind that a BMI is only a screening tool that is used by doctors and
healthcare professionals to categorize your weight. There may be other factors
that contribute to your high or low number that have nothing to do with your
weight, like a long-term illness that produces an underweight BMI or lots of
muscle mass that produces a high BMI.
Once you determine your BMI, you should check with your doctor if you're
outside of the normal range. Your doctor can provide you with solutions to help you either gain
or lose weight when needed. You should not undergo any weight loss or weight
gain program without first consulting your doctor, who can offer additional
testing and nutritional counseling that can help you meet your goals.
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