How it works
Enter your height and weight (in metric or imperial units) and click Calculate. The free BMI calculator instantly computes your Body Mass Index using the formula BMI = weight(kg) / height(m)² and tells you whether you are underweight, normal weight, overweight, or obese.
Why use this tool?
BMI is the most widely used screening tool by doctors and fitness professionals to assess body weight relative to height. Track your BMI over time to monitor health progress and set realistic fitness goals.