BMI Calculator

Chart your BMI against the national average

Check my BMI

Health dangers due to obesity

These consequences are related to overweight and obese adults

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

Derivation

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
This app will calculate your body mass index and tell you if you are underweight, overweight or if your weight is optimal. Just enter your vital statistics and click the button. Your result will be shown on a graph for you.

Do the sums

Measure your BMI with the formula below
  • BMI = weight(kilograms) / height2 (metres2)         (Metric Units)
  • BMI = 703 . weight(pounds) / height2 (inches2)         (Imperial Units)

BMI limitations

BMI is proportional to the mass and inversely proportional to the square of the height. So, if all body dimensions double, and mass scales naturally with the cube of the height, then BMI doubles instead of remaining the same. This results in taller people having a reported BMI that is uncharacteristically high, compared to their actual body fat levels.
See wikipedia.org/wiki/Body_mass_index#Limitationsinfomation.