Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. It is calculated by dividing a person's weight in kilograms by the square of their height in meters (kg/m²).

BMI Categories (WHO Adult Standards):

• Below 18.5: Underweight
• 18.5 – 24.9: Normal weight
• 25.0 – 29.9: Overweight
• 30.0 and Above: Obesity

Disclaimer: BMI is a screening tool and does not diagnose body fatness or health of an individual. Other factors like muscle mass, age, sex, and ethnicity can influence BMI. Consult with a healthcare provider for a comprehensive health assessment.