Body Mass Index calculator Step 1 - enter your height: cm or inches Step 2 - enter your weight: Kg or lb Your BMI = What does it mean? Below 20 = You fall into the underweight category 20-24.9 = You're BMI indicates that you are normal or average 25-29.9 = This indicates that you are overweight 30+ = Your BMI suggest obesity Body Mass Index (BMI) can be used to indicate if you are overweight, obese, underweight or normal. It will, however, overestimate fatness in people who are muscular or athletic. Women tend to believe they look their best at values between 20 to 22 and men are usually satisfied with a BMI of 23 to 25. If your BMI is between 20 – 24.9, your life expectancy is longer than average. You don't need to lose weight. If your BMI is between 20 and 25, you are not considered overweight by most people. But if your BMI is 25 or more, that's not good. But you knew that already. Above all, Don't Worry, Be Happy. It’s unhealthy to have anxiety over a less-than-perfect body image. And, if this calculator's description of your body seems wrong for you, just trust your own judgment. A healthy mental attitude is just as important as physical fitness.