Basal Metabolic Rate (BMR) is the energy you expend maintaining normal body functions such as keeping your heart beating, breathing and maintaining your body temperature. These ongoing functions account for 60-70% of the calories you use each day.
So what is the point of knowing your BMR? It helps you set a realistic and healthly target for weight managment. For those wishing to lose weight it not only helps establish an appropriate daily calorie allowance it is a good reality check on whether your goals are realistic for long term weight loss.