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How Do I Check My BMI?

BMI, or body mass index, is a measure of body fat that takes into consideration a person's height and weight. This calculation is most accurate for adults age 20 and up. According to the National Heart Lung and Blood Institute, a BMI under 18.5 is considered underweight, a BMI between 18.5 and 24.9 is normal weight, a BMI between 25 and 29.9 is overweight and a BMI over 30 is considered obese .

Scale
Metal tape measure

Instructions

- 1
  Multiply the weight in lbs. by 703. For example, if the weight is 140 lbs., multiply 140 by 703 to yield 98,420.
- 2
  Square the value of the height. For example, if the height is 5'8", square 68 inches to yield 4,624 in^2. The "^" symbol indicates that the next number is raised to that power.
- 3
  Divide the value from Step 1 by the value from Step 2. In this example, divide 98,420 by 4,624 to yield 21.28 lbs. per in^2. Therefore, in this example, the BMI falls in the normal weight category.

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