BMI (body mass index), which is based on the height and weight of a person, is an inaccurate measure of body fat content and does not take into account muscle mass, bone density, overall body composition, and racial and sex differences.
BMI = weight in kilograms divided by height in meters squared.
Research shows that BMI divides the weight by too much in short people and too little in tall individuals. This results in tall people believing they are fatter than they really are, and short people thinking they are thinner.
Try working out your Body Fat Percentage as it is much more accurate taking into account many more variables.