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Severe obesity is a complex, medical disease, which affects more than four million people in the United States.
A body mass index (BMI) above 40 which usually means at least 100 pounds overweight for men and women indicates that a person is severely obese. Your physician has probably called it morbid obesity. You may calculate your BMI with this formula: weight in pounds x 705 divided by your height in inches and divide that number by your height in inches again.
The result of this calculation is your BMI. People with a BMI of between 35 and 40 who suffer from other medical illnesses can also be classified as suffering from severe or morbid obesity.

 

Weight:
lbs.
Height:
Ft. In.
 
Body Mass Index:
According to the Panel on Energy, Obesity, and Body Weight Standards published by American Journal of Clinical Nutrition, your category is:
 

If your BMI is below 20:
This indicates a lean BMI, which means you have a low amount of body fat. If you are an athlete, this can be desirable. If you are not an athlete, a lean BMI can indicate that your weight may be too low which may lower your immunity. If your BMI and body weight are low, you should consider gaining weight through good diet and exercise habits, to increase your muscle mass.

If your BMI is between 20 and 22:
This indicates the ideal, healthy amount of body fat, which is associated with living longest, and the lowest incidence of serious illness. Coincidentally, it seems this ratio is what many individuals perceive to be the most aesthetically attractive.

If your BMI is between 22 and 25:
This is still considered an acceptable range, and is associated with good health.

If your BMI is between 25 and 30:
You are considered “Hefty” and should finds ways to lower your weight, through diet and exercise. You are at increased risk for a variety of illnesses at your present weight. You should lose weight by changing your diet and exercising more.

If your BMI is over 30:
This indicates an unhealthy condition, your excess “Prosperity” is putting you at risk for heart disease, diabetes, high blood pressure, gall bladder disease and some cancers. You should lose weight by changing your diet and exercising more.