Body Mass Index (BMI) is a measure of body fat based on your weight in relation to your height. It applies to adult men and women.

BMI Categories:

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5 to 24.9
• Overweight: BMI 25 to 29.9
• Obese: BMI 30 or greater

Limitations: BMI doesn't account for muscle mass, bone density, overall body composition, and racial and sex differences. For example, athletes might have a high BMI due to increased muscle mass rather than increased body fat.

Waist-to-Height Ratio is a simple screening tool that can indicate central obesity. A healthy ratio is generally considered to be 0.5 or less, meaning your waist circumference should be less than half your height.