First go to calculate your BMR. That's where you put in your weight and level of activity. To be conservative, I say that I'm sedentary. Then, I add in the activities daily. I have been walking lately and really, a couple of miles does not burn up all that many calories!
I eat around 2,000 calories a day (that's what I aim for) and I've been losing weight with that number. Now, when I don't think about it and eat what I want, in restaurants, snacking, and 'not-dieting,' I easily reach 3,000 calories. That is not such an unusual number! So, if it's easy to eat that much, it shouldn't be shocking to burn that many calories - if it were that excessive to burn that many calories, I'd be as big as a truck, given my pre-dieting, sedentary days.