* In this BMI Calculator app you can check your BMI. * And you can see your healthy weight according to your height. What is BMI? Body mass index (BMI) is used to determine whether you are in an ideal weight range for your height. It gives you an idea of whether you’re "underweight", a "healthy weight", "overweight", or "obese" for your height. BMI is one type of tool to help health professionals assess the risk for chronic disease.