BMI Formula

• When calculating BMI, the formula used is weight in lbs. / (height in inches)squared x 703. Divide your weight in pounds by your height in inches squared. Then you multiply the result by 703 and that number is your BMI. The formula is the same for adults and children. It is important to note that the result is not a diagnosis. If you fall into the overweight or obese category in BMI, it doesn't mean you are unwell. It is important to speak with your doctor about your weight and the associated risks.
  
  

Data

• For anyone over 20 years old, BMI numbers fall under the same categories for both men and women. If your BMI is 18.5 or under, you are considered underweight. If your number falls into the range of 18.5 to 24.9 you fall into the normal category. People with a BMI between 25.0 and 29.9 are considered overweight, while anything above 30 is considered obese. If your BMI is in the overweight or especially the obese range, you should speak to your doctor about any health risks.
  
  

Reliability

• Though BMI is a fairly reliable indicator of weight ranges, it is important to notice that some variations exist. When compared at the same BMI, women tend to have more fat on their bodies than men. Younger people usually are more lean than older people with the same BMI. Also, athletes will have a high BMI because they have a lot of dense muscles. Though BMI is just one indicator of weight, it also is important to factor in weight circumference and underlying issues such as high blood pressure.