Body Mass Index (BMI) is a simple, widely used tool to assess an individual’s body weight relative to their height. It is calculated by dividing a person’s weight in kilograms by the square of their height in meters. BMI helps categorize individuals into different weight groups—underweight, normal weight, overweight, or obese—which can indicate potential health risks related to conditions such as heart disease, diabetes, and high blood pressure. While BMI is useful for general health assessments, it doesn’t account for factors like muscle mass or fat distribution, so it should be used alongside other health indicators for a complete picture of well-being.