Body Mass Index (BMI) Calculator

The Body Mass Index (BMI) calculator gives the height to weight ratio of a person based on age and gender. It is not a diagnostic tool for body fat, because an overweight person may have the same BMI as a healthy weight person who has lots of muscle tone.

Always use this tool in conjunction with the body fat calculator to get a more relevant answer for your weight/height and body fat.

The Body Mass Index (BMI) classification is calculated by deviding weight by the square of height.
Enter your body weight
Enter your height
Calculated BMI number =
BMI Classification =

The body mass classifications are defined as follows:

  • Less than 20 - Underweight
  • 20 - 24.9 - 'Normal' weight (Grade 0)
  • 25 - 29.9 - Overweight/'plump' (Grade I)
  • 30 - 40 - Moderately obese (Grade II)
  • More than 40 - Severely obese (Grade III)


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