All About Health Tools

Body mass index (BMI) calculator

The Body Mass Index (BMI) tool is used to derive the height to weight ratio of a person, based on age and gender. It is not a diagnostic tool for body fat, because an overweight person may have the same BMI as a healthy weight person who has lots of muscle tone.

Body Mass Index


What BMI means


Risk of Disease According to BMI and Waist Size

BMI BMI Meaning Waist less than or equal to
40 in. (men) or
35 in. (women)
Waist greater than
40 in. (men) or
35 in. (women)
18.5 or less Underweight N/A N/A
18.5 - 24.9 Normal N/A N/A
25.0 - 29.9 Overweight Increased High
30.0 - 34.9 Obese High Very High
35.0 - 39.9 Obese Very High Very High
40 or greater Extremely Obese Extremely High Extremely High


Use the other health tools to help you exercise more efficiently and lose more weight in a healthier way.

Enjoy better health!