BMI Healthy overweight calculator Calculate Your BMI Using Our Handy Calculator BMI ranges BMI less than 18.6Underweight BMI 18.5 - 24.9Normal Range BMI 25 - 29.9Overweight BMI 30 - 34.9Class 1 Obesity BMI 35 - 39.9Class 2 Obesity BMI greater than 40Class 3 Obesity