The Body Mass Index (BMI) is a widely used screening tool in healthcare for identifying potential weight-related health risks. It calculates the ratio of an individual's weight to their height squared and categorizes the result into various weight ranges, from underweight to various degrees of obesity. The formula for BMI is:

Based on the BMI value, individuals are classified into various categories, which help in identifying potential health risks associated with body weight:
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 to 24.9
- Overweight: BMI 25 to 29.9
- Obesity (Class 1): BMI 30 to 34.9
- Obesity (Class 2): BMI 35 to 39.9
- Morbid Obesity: BMI greater than 40
- Super Obesity: BMI greater than 50
- Super-Super Obesity: BMI greater than 60
These classifications assist healthcare professionals in making initial assessments of weight-related health risks and determining the need for further evaluations or interventions.
| Category | BMI |
|---|---|
| Underweight | Less than 18.5 |
| Normal weight | 18.5 to 24.9 |
| Overweight | 25 to 29.9 |
| Obesity, Class 1 | 30 to 34.9 |
| Obesity, Class 2 | 35 to 39.9 |
| Morbid obesity | Greater than 40 |
| Super obesity | Greater than 50 |
| Super-super obesity | Greater than 60 |