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Body Mass IndexBMI uses a mathematical formula based on a person's height and weight. BMI equals weight in kilograms divided by height in meters squared (BMI = kg/m2).
A BMI of 25 to 29.9 indicates a person is overweight. A person with a BMI of 30 or higher is considered obese. The BMI does not measure body fat levels - so you could be rippling with muscle - and BMI will show obese.
Like the weight-to-height table, BMI does not show the difference between excess fat and muscle.
However, take your BMI reading with a grain of salt - or ignore it completely! If a bodybuilder measured their BMI, they would show up as obese. This is obviously not true. It is difficult to apply a "one-size-fits-all" to unique body types. Some ethnic groups also have denser and heavier bone structure which can skew the results even more. We recommend using the Body Fat Calculator instead.
Last Updated 28 Nov 2012