It sounds like you're new to the website. Have you filled out the profile? Any calorie number that is going to be meaningful as far as balancing what you eat with what your body expends is going to be in a context. That means: height, age, current weight, etc. Also, your daily level of activity.
I'm using classic fitday but the current fitday 2.0 should ask for that kind of information when you set your profile.