Chart your BMI against the national average

Risks of being overweight

These dangers are identified with overweight and obese adults

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

Derivation

B.M.I. Prime is simple way of defining a single figure that is not immedieately related to any other units of measurement, but which can quickly and easily rank a person into a category. Eg:
• BMI Prime < 0.74 = Underweight
• BMI Prime > 0.74 and < 1.00 = Optimal weight
• BMI Prime > 1 = Overweight
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 simple maths

This is how BMI is calculated
• BMI = weight(kilograms) / height2 (metres2)         (Metric Units)
• BMI = 703 . weight(pounds) / height2 (inches2)         (Imperial Units)

BMI limitations

BMI calcs ignore variation in physical characteristics.
See wikipedia.org/wiki/Body_mass_index#Limitations for more details.