If you have been calculating your Body Mass Index or BMI to check how healthy you are then you are probably not doing it the right way. Because BMI is not a good indicator of health according to researchers from the University of Alberta. Body Mass Index is a person’s weight in kilograms divided by the square of his/her height in meters (BMI = kg/m2). This formula is being used to decide if you are underweight normal weight overweight or obese. While a BMI of 25.0 or more is considered as overweight the accepted healthy range is 18.5 to 24.9.