Body mass index, or BMI, is a value calculated from your weight and height. The U.S. Department of Health and Human Services considers BMI a reliable indicator of body fat for most of the population; it's also considered a valid indicator of risk for diseases that are associated with increased body fat. While BMI does not measure body fat directly, it's considered to be an alternative for direct measurements of body fat. Calculating your BMI is an inexpensive method of screening for weight categories that can lead to health problems.
Step 1
Measure your total body weight in pounds with a scale. Weigh yourself in as little clothing as possible to get an accurate weight. Record your weight.
Step 2
Measure (or have a friend measure) your height in inches with a tape measure. Measure yourself while barefoot to ensure an accurate height, and record this number in inches.
Step 3
Square your height by multiplying it by itself. For example, if your height is 72 inches, your calculation would be 72 x 72 = 5,182. Record your result.
Step 4
Divide your weight in pounds by your height in inches squared. If you weigh 200 pounds, your calculation would be 200 / 5,182 = 0.0385. Record your result.
Step 5
Multiply this result by 703. Using the same values as the examples above, the entire calculation is 0.0385 x 703 = 27.07. Our example's BMI would be considered "overweight."
Tips and Warnings
- Consult a BMI table to determine if your BMI places you in a healthy category.
- BMI often overestimates body fat in individuals with greater muscle mass, such as atheltes or bodybuilders. Conversely, BMI often underestimates body fat in seniors and individuals with increased muscle loss.
Things You'll Need
- Weight scale
- Tape measure
- Calculator
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