I have found that a lot of calorie calculators tend to start everyone really low with their calories, so much so that I wanted to do the math and figure things out for myself. And that is when I started reading stuff and came across the Harris-Benedict equation en.wikipedia.org/wiki/Harris%E2%80%93Bened
and figured out my BMR -- the amount of calories my body would burn if I did nothing but lie in bed all day and used their exercise/activity calculations to figure out how many calories I would need to maintain my current level of living+activity. Then I would subtract the 1000 calorie deficit to lose 2 pounds a week from that number. I hope that make some sense.
Oh and I just wanted to say too that 2 pounds/week is a really ambitious goal. It is hard for a lot of people to lose at that rate. I just didn't want you to be discouraged if you didn't see that kind of actual loss.