The BMI calculator is a useful tool that measures whether you are overweight, underweight, or just right. Your weight alone is not enough to tell, as a tall, skinny man may easily weigh more than a short but rotund woman. The body mass index, or BMI, overcomes this problem by finding a ratio of your weight to your height and returning a single number. This number will fit into a category on the scale of BMI ranges, which are defined as underweight, normal, overweight, and obese. To work out ... For adults, BMI categories are underweight, healthy weight, overweight, and obesity. Obesity is further subdivided into three classes. BMI is a screening measure. BMI should be considered with other factors when assessing an individual's health. The updated guidelines establish BMI over 23 kg/m² as a new threshold for obesity. Waist Circumference and Waist-to-Height Ratio are now also considered important measures. Use the interactive BMI chart and table to check your BMI against the World Health Organization's official classifications. Find out if your BMI is underweight, normal, overweight or obese based on your height and weight.
