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

Dr. Glickman says doctors will calculate BMI by dividing your weight in kilograms by your height in meters squared. Here's the exact formula: BMI = weight (in kilograms)/height (in meters)2 In the ...

In general, people are considered to be at a healthy weight if their BMI is between 18.5 and 24.9. A BMI of 25 or more is ...