Body Mass Index (BMI) is a number calculated from a person's weight
and height. BMI provides a reliable indicator of body fatness for most
people and is used to screen for weight categories that may lead to
You can calculate your BMI with this formula: weight (in pounds) /
[height (in inches) x height (in inches)] x 703 or use the Academy BMI
The Centers for Disease Control and Prevention uses BMI to define terms like overweight and obese:
- Underweight: BMI below 18.5
- Normal weight: 18.5 to 24.9
- Overweight: 25.0 to 29.9
- Obese: 30.0 and above.
- Extrem (Morbid) Obesity: 40 or above.
While BMI calculations for children and teens use the same formula as
adults, criteria used to define obesity and overweight are different
for young people because of factors like body fat differences between
boys and girls and variations in body fat at different ages. Visit the
BMI Percentile Calculator for Child and Teen to determine your child's
Waist-to-hip ratio looks at the proportion of fat stored on your body around your waist and hip. To calculate your waist to hip ratio input your measurements.
- Women with waist-to-hip ratios of more than 0.8 are at increased health risk because of their fat distribution.
- Men with waist-to-hip ratios of more than 1.0 are at increased health risk because of their fat distribution
*Information by the Academy of Nutrition and Dietetics.