Body mass index (BMI) definition

Body Mass Index (BMI) is a key indicator that correlates weight with height. The National Institutes of Health (NIH) now describes normal weight, overweight, and obesity based on BMI instead of the regular height/weight chart.

  • Women’s BMI is 27.3 or higher, and men’s BMI is 27.8 or higher.
  • Obesity is a BMI of 30 or higher for any sex (about 30 pounds overweight).
  • Muscular people may have a higher BMI without health risks.

Calculate BMI