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BMI is your weight (in kilograms) over your height squared (in centimeters). Let's calculate, however, using pounds and inches. For instance, the BMI of a person who is 5'3" and weighs 125 lbs is calculated as follows: Multiply the weight in pounds by 0.45 (the metric conversion factor)

To work out your BMI : divide your weight in kilograms (kg) by your height in metres (m), then divide the answer by your height again to get your BMI.

Your BMI is based on your height and weight. ... Underweight: Your BMI is less than 18.5. Healthy weight: Your BMI is 18.5 to 24.9. Overweight: Your BMI is 25 to 29.9. Obese: Your BMI is 30 or higher.

But in recent years, more researchers argue that it's not the most accurate way to measure body weight. For years, scientists have said that BMI can't distinguish between fat and muscle, which tends to be heavier and can tip more toned individuals into overweight status, even if their fat levels are low.