The Body Mass Index (BMI) calculation is used as a screening tool to categorize individuals based on their body weight relative to height, providing insights into potential weight-related health risks. It helps assess whether a person falls into categories such as underweight, normal weight, overweight, or obese. BMI is a useful initial assessment but does not account for factors like muscle mass and fat distribution. Healthcare providers use BMI alongside other metrics to create a comprehensive understanding of an individual's weight status and to guide recommendations for lifestyle changes.