Calculate my BMI

Chart your BMI against the national average

What's 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 History

Body Mass Index Prime is method of using the results of the BMI calculations to quickly and easily rank a person into a category. Eg:
  • BMI Prime less than 0.74 = Underweight.
  • BMI Prime greater than 0.74 and less than 1.00 = Optimal weight.
  • BMI Prime greater than 1 = Overweight
b m i Prime is a variation of the Quetelet index. Put simply, if you have a Prime of less than 0.74, you are underweight. If your prime is more than 0.74 and less than 1.00, your weight is ideal. If your bmi prime is more than 1 you are defined as being overweight.

The BMI 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.