Medically reviewed by Suzanne Fisher, RD Key Takeaways Body mass index (BMI) is a calculation used to estimate your body fat.

BMI, also referred to as Body Mass Index, is a method used in screening one’s body fat. This is done by measuring the height and weight of a person and converting it into their equivalent BMI.

Using a body mass index (BMI) calculator can help a person determine whether their weight is within the recommended range for their height. However, BMI calculations have several important limitations ...