Daily calorie needs are the number of calories your body needs each day, to carry out the body's main functions, and to carry out daily activities.
These daily calorie needs can be used as a reference for how much food you should consume per day. Daily caloric needs are obtained from BMR numbers multiplied by physical activity factors.
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body needs to carry out the functions of the heart, brain, kidneys, and other organs, when you are not moving at all.