BMI, or Body Mass Index, is a common assessment tool used to estimate body fat, assess body weight and determine risk for developing chronic diseases. BMI can be calculated using an individual’s current height and body weight, and is determined the same way for both men and women. BMIs above a healthy range can increase an individual’s risk for developing diseases related to being overweight or obese. BMIs may overestimate body fat in extremely muscular individuals and underestimate body fat in elderly people with decreased muscle or bone density.
Calculate BMI
Step 1
Determine height, in inches, using a tape measure. Stand up straight against a wall and have another person measure from the heel to the top of the head. If another person is not available to perform a height measurement, stand up straight against a wall and mark where the top of the head meets the wall. Measure your height in inches and write down the measurement.
Step 2
Determine your current body weight in pounds using a scale. Make sure the scale is calibrated properly before taking the weight measurement. Write down the measurement in pounds.
Step 3
Calculate the BMI using the following formula provided by the American Dietetic Association: (weight in pounds X 703) / height in inches / height in inches. First, multiply your current body weight (in pounds) by 703. Then divide that number by your height in inches; finally divide by your height in inches again to calculate BMI.
Step 4
Determine if your BMI falls within a healthy weight range. According to the American Dietetic Association, individuals with BMIs below 18.5 are considered underweight; BMIs of 18.5 to 24.9 are considered healthy weights, 25 to 29.5 overweight and 30 or above obese.
Tips and Warnings
- If your current height and body weight are known, another quick and easy way to determine BMI by using an online BMI calculator such as the one provided by the American Dietetic Association’s website.
Things You'll Need
- Calculator
- Tape measure
- Scale
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