Your BMR, or basal metabolic rate (metabolism), is the energy expended by the body at rest to maintain normal bodily functions like (breathing). To determine the optimal energy consumption for your body, you can use this Basal Metabolic Rate Calculator. Click here for more informations about BMR In average day your body your body "burns" more calories than at rest. For total daily calories expend you need also your AMR - Active Metabolic Rate. AMR is the total amount of calories you expend through the day, by activities like (walking, dancing, reading, running etc.).