Free BMI Calculator - Calculate Your Body Mass Index
Calculate your Body Mass Index instantly with our free BMI calculator. Get your results in metric or imperial units, understand your weight category, and see where you fall on the BMI scale with detailed health insights.
What is BMI? Body Mass Index (BMI) is a widely-used screening tool that measures body fat based on your height and weight. Healthcare professionals use BMI to assess whether someone is at a healthy weight, underweight, overweight, or obese. Our BMI calculator uses the standard formula: BMI = weight(kg) / height(m)² for metric measurements, or BMI = (weight(lb) / height(in)²) × 703 for imperial units.
Understanding Your BMI Results: The BMI chart categorizes results into four main weight categories: Underweight (BMI below 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), and Obese (30 or higher). Each category has different health implications. A healthy BMI typically falls between 18.5 and 24.9, which is associated with lower risks of weight-related health conditions.
Features: Our free BMI calculator offers seamless switching between metric (kilograms and centimeters) and imperial (pounds, feet, and inches) measurement systems. You'll get instant BMI calculation results with color-coded weight categories for easy understanding. The visual BMI scale shows exactly where your result falls across the spectrum, helping you visualize your position relative to healthy weight ranges.
How to Use This BMI Calculator: Simply enter your weight and height in your preferred unit system (metric or imperial), and the calculator instantly determines your BMI. The tool displays your numeric BMI value, your weight category, and a visual representation on the BMI scale. Use this information as a starting point for conversations with healthcare providers about your weight and overall health.
Important Health Considerations: While BMI is a useful screening tool, it has limitations. BMI may not accurately reflect health status for athletes with high muscle mass, pregnant or nursing women, elderly individuals, or certain ethnic groups. Body composition, muscle mass, bone density, and overall health markers are also important factors. Always consult qualified healthcare professionals for personalized medical advice and health assessments.