To begin, consult a dietitian to find out the amount of calories you require for maintaining your current weight - it depends on your gender, activity level and age. (md-health.com)
That is, you can run on that elliptical all day long, but if you eat poorly, you will likely maintain your current weight. (dietselfhelp.com)
It's important to take note of the fact that this number is actually the number of calories that this person needs to eat in order to maintain his current weight because of his / her lean body mass and more importantly at his current physical activity level. (fitnessandpower.com)