BMI

BMI is a measure that estimates a persons body fat based on their age, height and weight.

Understanding BMI

Adult BMI classifications are: underweight, normal, overweight, obese.

When used to predict an individual's health, rather than as a statistical measurement for groups, the BMI has limitations that can make it less useful than some of the alternatives, especially when applied to individuals with abdominal obesity, short stature, or high muscle mass.

30 and over Obese
25 - 29.9 Overweight
18.5 - 24.9 Normal
Under 18.5 Underweight
  • Obese


  • 30

  • Overweight


  • 25

  • Normal


  • 18.5

  • Underweight
Formula
Metric system

The BMI is defined as the body mass divided by the square of the body height.

weight_in_kilograms height_in_meters 2 = BMI
Imperial system (US)

The BMI is defined as the body mass divided by the square of the body height.

weight_in_pounds height_in_inches 2 * 703 = BMI