Definition of Morbid Obesity
Calculating BMI (Body Mass Index) is an effective screening tool for measuring body fat based on height and weight. Obesity is a disorder involving excessive weight with a person’s BMI of 30 and over.
Morbid obesity means that an individual is extremely obese with a high BMI of at least 40+ or over 100 pounds overweight. Severe obesity comes with the danger of serious illness.
Calculate Your BMI
A severely obese individual generally has one or more health problems, or comorbidity, related to the amount of excess weight. Those suffering from mild, moderate, or extreme obesity also have a higher risk of developing metabolic disorders.
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These obesity-related medical conditions can include type 2 diabetes, hypertension, high blood pressure, heart, cardiovascular disease, 13 types of cancer, sleep apnea, etc. There are also physical, mental, and psychological issues associated with obesity. Morbid obesity typically defines a body mass index level suitable to qualify for weight loss surgery in the United States.
Am I Morbidly Obese?
BMI | Weight Category | Obesity Class |
---|---|---|
Less than 18.5 | Underweight | |
18.5 to 24.9 | Normal – Healthy Weight | |
25 to 29.9 | Overweight | |
30 to 34.9 | Obese | Class I |
35 to 39.9 | Severe Obese | Class II |
40 to 49.9 | Morbidly Obese | Class III |
Over 50 | Super Morbidly Obese | Class IV |
Over 60 | Super-Super Morbidly Obese | Class V |
What BMI is Considered to be Super Obese?
According to the National Heart, Lung, and Blood Institute, BMI measures an individual’s body fat strictly by height and weight as a standard metric.
- BMI = 18.5 to 24.9 – Normal
- BMI = 25 to 29.9 – Overweight
- BMI = 30 to 39.9 – Obese
- BMI = 40 to 49 – Morbidly Obese (Class III)
- BMI = 50 to 59 – Super Morbidly Obese
- BMI = 60+ – Super-Super Morbidly Obese

Morbidly Obese Chart
Body Mass Index is a widely used tool to measure obesity. BMI is a very “general” measurement of obesity using height and weight as the only factors.

Health Indicators
With only two factors measuring excess body fat, BMI does not consider things like muscle, % body fat, and individuals with certain variables that put them in a different obesity class than they should be. Body Mass Index strictly measures your weight in kilograms (or pounds) and your height in inches/centimeters using standard or metric measures.
Waist Circumference (WC) is a helpful guideline for measuring obesity. The fat around our midsection is related to the fat around the organs. High waist measurement correlates to high blood fat, high blood pressure, coronary circulatory disease, and diabetes.
Waistline Measurement Chart*
Men | Women | |
---|---|---|
Low Risk | Less than 37 in | Less than 31.5 in |
High Risk | 37 – 40 in | 31.5 – 34.6 in |
Very High Risk | More than 40 in | More than 34.6 in |
* The risk factor cut-off depends on race and ethnicity.
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