BMI Calculator

Graph your BMI against the healthy 'norm.'

What is my BMI?

Health dangers due to obesity

These risks are associated with overweight and obese adults

Adults whose BMI is greater than 25 (overweight) or whose BMI is greater than 30 (obese) have an elevated risk for many diseases and health conditions, including,:

BMI Origins

Devised all the way back in way back in 1830, the BMI is a single figure used to as a way of measuring a person's body shape. Put simply, it is calculated by dividing the body's weight by the square of their height. Eg: Kilograms: weight, divided by Metres (Meters): height. The BMI, also known as the Quetelet index, is a measure used to estimate a person's body shape based upon a person' weight and height. It originated in Belguim around the 1840's by Adolphe Quetelet. It is a simple calculation based on the individual's body weight divided by the square of their height.

The formula

Use the body mass formula to get your bmi
  • BMI = weight(kilograms) / height2 (metres2)         (Metric Units)
  • BMI = 703 . weight(pounds) / height2 (inches2)         (Imperial Units)

BMI limitations

BMI is particularly inaccurate for people who are very fit or athletic, as their high muscle mass can classify them in the overweight category by BMI, even though their body fat percentages frequently fall in the 10-15% category, which is below that of a more sedentary person of average build who has a normal BMI number.
See wikipedia.org/wiki/Body_mass_index#Limitations for further clarification.