What does ‘BMI’ stand for? What do the various BMI categories mean? BMI stands for Body Mass Index. It gives you an idea of how your weight compares to common values and is calculated as your weight (in kilograms) divided by the square of your height (in metres) or BMI = kg/m2 Normal weight ranges: Body mass index (BMI): Underweight : BMI is less than 18.5. Normal weight : BMI is 18.
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