Hey,
I use My Fitness Pal .com which is free and it tells you how many calories for your height and weight and fitness you need, and then how many you should have to lose 1lb a week, or 2lb a week etc. And there is a section to note what you eat and it counts up your calories for you, and also you can include what exercise you do.
Thought it might help as I wouldn't have a clue otherwise :S