The Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. Use the "Metric Units" option for the International System of Units or the "English Units" option to convert units into either US or metric units..
This is Basal Metabolic Rate Calculator.Calculate your BMR. i.e. the calories you are going to burn if you just stay in bed all day. Your BMR depends on your gender, weigh, height, and age. It decreases when your age increases, which means the older you get the harder it becomes to stay slim (unless you excercise or keep diet).