Here’s what BMI is, when it’s useful, where it falls short and what else to pay attention to.

Most people have seen the letters BMI on a health form, fitness app, or medical report. The number is often presented beside a label such as “healthy weight,” “overweight” or “underweight,” but the ...

Body mass index (better known as BMI) has long been used to get a quick and easy snapshot of a person's body fat levels. To calculate someone's BMI, you divide their weight in kilograms by their ...