There are lots of places online that calculate the number of calories you need per day. Here are a couple more:

http://www.cancer.org/docroot/PED/co...Calculator.asp

http://walking.about.com/cs/calories/l/blcalcalc.htm

One thing to keep in mind - if you're not getting enough calories, your body goes into starvation-protection mode and slows down your metabolism, which keeps you from losing weight. So it is important to make sure you eat enough.

I've recommended this book elsewhere but I'll say it again - Nancy Clark's Sports Nutrition Guidebook is an excellent resource for answering questions like this, and in general for making sure you eat the right amounts of the right kinds of foods.

http://www.nancyclarkrd.com/books/sportsnutrition.asp