The Body Mass Index (BMI) Calculator is a vital health screening tool designed to help you understand your body weight in relation to your height. BMI is a widely recognized metric used by healthcare professionals and international health organizations, such as the WHO, to categorize individuals into different weight classes: Underweight, Healthy Weight, Overweight, and Obese. While BMI does not directly measure body fat percentage or overall health, it provides a useful initial assessment of potential weight-related health risks. Our calculator supports both the Metric system (kilograms and centimeters) and the Imperial system (pounds and inches), providing a seamless experience for users worldwide. Beyond just calculating the number, our tool provides a visual scale and a clear interpretation of your result based on standard medical guidelines. All calculations are performed entirely within your browser using client-side JavaScript, ensuring that your sensitive personal health data—including your exact weight and height—is never transmitted to an external server or stored in a database. Whether you're tracking your fitness journey, consulting with a nutritionist, or simply curious about your weight category, this tool provides the accuracy and privacy needed for personal health monitoring. It is important to remember that BMI is a general indicator and may not be fully accurate for certain groups, such as highly muscular athletes, the elderly, or pregnant women.