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Definition of BMI

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Updated February 18, 2014

Definition:

A standardized estimate of an individual’s relative body fat calculated from his or her height and weight. The formula for calculating BMI is weight in kilograms (kg) divided by height in meters (m) squared.

According to the National Institutes of Health, your BMI can help classify your weight as follows:

  • Underweight = <18.5
  • Normal weight = 18.5-24.9
  • Overweight = 25-29.9
  • Obesity = BMI of 30 or greater

Also Known As: Body Mass Index
Examples:
My BMI suggests that I am overweight.
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