What is your BMR?
Your Basal Metabolic Rate (BMR) shows the number of calories your body needs to operate. This doesn't account for any activity, it's simply the energy needed to sustain a heartbeat, breathing and normal body temperature. It measures the body at rest, not sleep, at room temperature.
If you know how many calories your body needs to function, you can calculate exercise and calorie consumption into your diet and weight loss plan to ensure that you are eating and exercising at the right level for you.