BMI Calculator

BMI Calculator is a free online tool that calculates your Body Mass Index based on your height and weight. BMI is a widely used screening indicator to assess whether a person's weight is in a healthy range relative to their height. Simply enter your height (in feet and inches or centimeters) and weight (in pounds or kilograms), and get instant results with health category interpretation including underweight, normal weight, overweight, and obese classifications. The calculator supports both metric (kilograms and centimeters) and imperial (pounds, feet and inches) unit systems, making it accessible for users worldwide. All processing happens entirely in your browser using JavaScript—your personal health data is never sent to any server, ensuring complete privacy. The tool displays your BMI value along with the corresponding health category based on the World Health Organization (WHO) classifications: Underweight (BMI below 18.5), Normal weight (BMI 18.5 to 24.9), Overweight (BMI 25 to 29.9), and Obese (BMI 30 and above). Common uses include personal health assessments, fitness tracking and goal setting, medical screenings and doctor visit preparation, weight management programs, and understanding your weight-to-height ratio. Important note: BMI is a screening tool and does not directly measure body fat or account for factors like muscle mass, bone density, age, sex, or ethnicity. Athletes and muscular individuals may have a high BMI despite having low body fat. For a complete health assessment, consult with healthcare professionals who can evaluate additional factors. The calculator provides instant real-time updates as you enter values, includes a helpful reference table showing all BMI categories, and works on all modern browsers including mobile devices. No registration, no signup, and completely free to use as many times as needed.