Body Fat Calculator

Chart your BMI against the national average

Check your BMI now

Health difficulties from being overweight

These difficulties are associated with obese and overweight adults

Adults whose Body Mass Index is greater than 25 (overweight) or whose BMI is greater than 30 (obese) have a marked increase in risk for various diseases and health conditions, including,:

BMI Origins

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 simple maths

You can use the following formula to calculate your BMI :
  • BMI = weight(kilograms) / height2 (metres2)         (Metric Units)
  • BMI = 703 . weight(pounds) / height2 (inches2)         (Imperial Units)

BMI limitations

BMI categories are generally regarded as a satisfactory tool for measuring whether sedentary individuals are underweight, overweight or obese with various exceptions, such as: athletes, children, the elderly, and the infirm.
See wikipedia.org/wiki/Body_mass_index#Limitationsinfomation.