Well if you lead an active lifestyle, you probably need more than 2,000 calories per day anyway. Counting calories isn't an exact science (an oversimplification, really) but here's a nifty calculator to use as a rule of thumb...
http://walking.about.com/cs/calories/l/blcalcalc.htm
I'm 6 foot 1, about 190 pounds, get about an hour of exercise each day...so I'm just above 3,000 calories per day.