BMI Calculator

About this calculator

Body mass index divides your weight in kilograms by the square of your height in metres. The World Health Organization's ranges for adults are: under 18.5 underweight, 18.5–24.9 healthy weight, 25–29.9 overweight, and 30 or above obese.

BMI is a quick population-level screening measure, not a diagnosis. It does not distinguish muscle from fat and can mislead for athletes, older adults and some ethnic groups — talk to a healthcare professional about what your number means for you.