Daily caloric needs?


Just trying to find out how many daily calories I need. I am a 5' 5" 115 pound female and am trying to lose a few pounds of belly flab from the holidays. I have heard it is safe to cut 500 calories a day to do this, but not sure what to cut that amount from. I am currently on day 18 of fb fit (I always do the hardest variation of exercises). I also ski, play soccer, and have 1.5 hour long gymnastics sessions with conditioning once a week and have basketball for 1 hour twice a week, so I am pretty active. I know the "recommended" daily amount of calories is 2000, but at that amount, before I started working out with fitness blender, I was actually gaining weight, which I'm guessing is because I'm pretty small. Thanks for your help!