This Body Mass Index calculator is easy to use and can be used in both metric or imperial measurements to determine what your BMI (Body Mass Index) is. One simply puts the following information into the boxes (your height and weight) and from there your bmi is easily determined. Use this calculator when ever you want to determine your bmi. Please be advised that ones BMI is not the tell all indicator of ones health and that there are other factors in determining ones obesity level such as the amount of muscle one has etc.