Body Mass Index Calculator
Body mass index (BMI) is a measure of body fat based on height and weight that applies to both adult men and women. BMI is recognized by the National Institutes of Health (NIH) and The World Health Organization as the best standard to judge obesity. BMI is also one of the most accurate and widely used measurements to determine if extra pounds pose health risks.

What does Grade 2 obesity mean? Sounds ominous..
The categories of obesity developed by the World Health Organization are:
BMI 25 to 29.9 – Grade 1 obesity (moderate overweight)
BMI 30 to 39.9 – Grade 2 obesity (severe overweight)
BMI > 40 – Grade 3 obesity (massive/morbid obesity).