BMI Calculator

What is a healthy weight

What is my BMI?

Health dangers from being overweight

These problems are identified with overweight and obese adults

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


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
This app will calculate your BMI and tell you if you are underweight, overweight or if your weight is optimal. Just enter your vital statistics and click the button. The results will be graphed out for you.

The simple maths

How Body Mass Index is actually calculated
  • 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 for further clarification.