Formula is:
Body weight (in KG) x 21.6 + 370 x activity factor
Activity factor is a number that's determined by how active (or not active) you are. Generally a sedentary person would use 1.25, someone who works out with moderate intensity 3-5 days a week would use 1.55, and someone who works out intensely 6-7 days a week would use 1.725.
To calculate one's weight in KG from pounds, divide number of pounds by 2.2. As someone said earlier, it's determined by weight, not height.
EDIT: This is the amount of calories you burn the entire day including active time, sorry about that.