One of the tools used to determine if a person is at a healthy weight is the body mass index (BMI). Your BMI is a number that is the result of a formula that uses your weight and height. A BMI rating is only a starting point to determine if a person is overweight. Blood pressure, cholesterol testing and other medical tests are some tests that may be used in conjunction with the BMI.
Purpose
The body mass index serves as a general guide that compares your weight to your height. If your BMI is out of the normal range, you are at risk for developing health problems. High blood pressure, type 2 diabetes and sleep apnea are some of the conditions caused by having a BMI outside of the normal range, according to the Centers for Disease Control and Prevention (CDC).
Formula
The BMI is based on a mathematical formula that uses your height in inches and your weight in pounds. To determine your BMI, square your height in inches. Then divide your weight in pounds by the result of squaring your height. Finally, you multiply the result by 703. The number you come out with is your BMI. This formula would like this: [pounds/(inches x inches) x 703]=BMI.
Ranges
In order to be classified as having a normal BMI, your BMI rating must be between 18.5 and 24.9, states the National Heart Lung and Blood Institute (NHLBI). Any rating under that range is considered underweight. People with a BMI of 25.0 to 29.9 are considered overweight, and anyone with a BMI over 30 is considered obese.
Benefits
If your BMI falls within the average range, your weight is considered appropriate in relation to your height. A person with an average BMI is less likely to have weight-related health complications and conditions than a person who is overweight or underweight.
Considerations
The BMI chart isn't always an accurate tool for determining who is at risk for weight-related conditions. Athletes who are extremely muscular may have a BMI higher than average because of muscle mass. Another instance where the BMI chart may be slightly off is for someone who is elderly. The National Library of Medicine (NLM) reports that a BMI slightly above the average range may be better for an elderly person.
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