How to calculate my energy expenditure ?

Calories Burning Chart per various Physical Activities
Exercise	Calories/hour (Approx.)
Sleeping	55
Eating	85
Sitting	85
Standing	100
Driving	110
Computer work or Doing Homework	140
Golfing	180
Dancing	260
Walking (5km/h)	250
Table Tennis	290
Tennis	350
Skating	420
Aerobics	450
Bicycling (moderate)	450
Jogging (8km/h)	500
Swimming (active)	500
Hiking	500
Rowing	550
Squash	650
Skipping with rope	700
Running	700
Football	476
Volleyball	204
Handball	476
Basketball	340
Martial Arts	612
Horseback riding	102
Gymnastics	204
Frisbee playing	136
Dodge Ball, Hopscotch	272
Badminton, Catch Ball	238

If you don't find your activity in this chart, check it on this link.