Basal metabolic rate (BMR) is the number of calories used by the body when it is at rest. This is the amount of energy your body would burn if you slept all day (24 hours). Factors that affect BMR:
Age: In youth, the BMR is higher; age brings less lean body mass and slows the BMR.
Height: Tall, thin people have higher BMR's.
Growth: Children and pregnant women have higher BMR's.
Body Composition: The more lean tissue, the higher the BMR. The more fat tissue, the lower the BMR.

BMR Calculator
Age (years):
Weight (lbs):
Height (inches):
BMR (men):
BMR (women):

Physical Activity, minutes/day
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Total Energy Requirement
calories/day for men
calories/day for women