How to Use This BMI Calculator
Body Mass Index (BMI) is a standard mathematical screening tool used globally to categorize a person's weight relative to their height. While it does not directly measure body fat or account for muscle mass density, it provides a very reliable generalized indicator of healthy weight ranges for adult men and women.
Using our completely free calculator is simple: select your preferred measurement system (Metric or Imperial), enter your current height and weight, and click calculate. The tool immediately crunches the math within your own browser without sending your personal health metrics to any external servers, ensuring 100% privacy.
The visual scale will plot your score according to the official World Health Organization (WHO) BMI classifications: Underweight (Under 18.5), Normal Weight (18.5 – 24.9), Overweight (25 – 29.9), and Obese (30 and above).