HERE IS YOUR FREE BMI CALCULATOR

The Body mass index (BMI) is a measure of body fat based on height and weight that applies to both adult  men and women. You can eaysily calculate how much (fat) you need to lose...

DOWNLOAD YOUR CALCULATOR

What Wikipedia ( http://en.wikipedia.org/wiki/Body_mass_index ) tells you about BMI:

A frequent use of the BMI is to assess how much an individual's body weight departs from what is normal or desirable for a person of his or her height. The weight excess or deficiency may, in part, be accounted for by body fat ( adipose tissue) although other factors such as muscularity also affect BMI significantly (see discussion below and  overweight). The  WHO  ^[6]  regard a BMI of less than 18.5 as underweight and may indicate  malnutrition, an  eating disorder, or other health problems, while a BMI greater than 25 is considered overweight and above 30 is considered obese. These ranges of BMI values are valid only as statistical categories when applied to adults, and do not predict health.

The U.S. National Health and Nutrition Examination Survey of 1994 indicates that 59% of American men and 49% of women have BMIs over 25. Extreme obesity — a BMI of 40 or more — was found in 2% of the men and 4% of the women. The newest survey in 2007 indicates a continuation of the increase in BMI, 63% of Americans are overweight, with 26% now in the obese category. There are differing opinions on the threshold for being underweight in females, doctors quote anything from 18.5 to 20 as being the lowest weight, the most frequently stated being 19. A BMI nearing 15 is usually used as an indicator for starvation and the health risks involved, with a BMI <17.5 being an informal criterion for the diagnosis of  anorexia nervosa.