Determining your body mass index (BMI) is an easy way to estimate body fat and overall health. BMI is simply a comparison of your height and weight. High BMI scores are linked to various negative health outcomes, including diabetes and cardiovascular disease. According to the National Institutes of Health (NIH), BMI is a good indicator of total body fat as well. However, it may overestimate body fat in individuals with large amounts of muscle mass and underestimate body fat in the elderly or individuals with low muscle mass. For most people though, BMI can be used at home to conveniently monitor health and wellness.
Step 1
Weigh yourself in kilograms or pounds with a scale. There are BMI formulas for both standard and metric measurements.
Step 2
Measure your height in meters or inches with a tape measure. Stand straight against a wall and have a friend help you, if necessary.
Step 3
Divide your body weight in kilograms by your height in meters squared, if using metric units. For example, an individual who weighs 65 kg and is 1.6 m tall would have a BMI of 65 kg / (1.6 m)^2 = 25.4. If using standard units, multiply your body weight in pounds by 703 then divide that number by your height in inches squared. For example, an individual who weighs 165 lbs. and is 72 inches tall would have a BMI of (165 lbs. X 703) / (72 inches)^2 = 22.4.
Step 4
Analyze your BMI score. If your BMI is below 18.5, you are considered underweight. If your score is between 18.5 and 24.9, you are normal weight. If your score is between 25.0 and 29.9, you are considered overweight. You are considered obese if your BMI score is over 30. Although it has limitations, the BMI is a strong indicator of overall mortality and risk for developing serious health issues. According to a study analysis published in the March 28, 2009 issue of The Lancet, mortality is lowest around a BMI score of 22.5 to 25 and increases around 30% with each additional 5 points.
Tips and Warnings
- Don't mix up your units while calculating BMI. Use meters with kilograms and inches with pounds.
- Consult your physician before starting any diet or exercise plan.
Things You'll Need
- Weight scale
- Tape measure
- Calculator
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