BMI Calculator

The body mass index (BMI), or Quetelet index, is a value resulting from the mass (weight) and height of an individual. The BMI is an attempt to count the amount of tissue mass (muscle, fat, bone) in an individual, and then categorize the individual as underweight, normal weight, overweight, or obese based on that value. Commonly accepted BMI ranges are underweight: under 18.5, normal weight: 18.5 to 25, overweight: 25 to 30, obese: over 30.