A person's BMI, or body mass index, is based on height and weight. It's often used to determine if a person is underweight, normal weight, overweight, or obese. But BMI doesn't consider muscle mass. Follow the links below to find WebMD's comprehensive coverage about how BMI is calculated, what it means, how to measure it with our innovative BMI Plus Calculator tool, and much more.
More About BMI
Read about BMI, waist size, and other measurements -- and why some fall short in gauging obesity.
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Quizzes and Tools
BMI News Archive