Your BMI or Body Mass Index is used to give you an indication if you are underweight, normal weight, overweight or obese. It is a number that relates to your body weight and your height. The formulas we use to calculate BMI are based on the two most commonly used unit systems - Metric Units and Imperial Units. We offer numerous localised BMI Calculators to help you calculate your BMI. Simply choose your locality below and click on the link to take you through your BMI Calculator.