I subscribe to Fitness magazine and I have also read this in another magazine... It says that if you multiply your goal weight by 14 if you do no exercise, 15 if you do moderate (most people should multiply by 15), or 16 if you are VERY active... it equals out to the amount of calories you should eat a day.
Mine is 2100 calories a day. Everyone seems like they post that they eat less than 1800 daily. Am I a nut if I eat about 2000 a day? It seems to be working for me. I'm starting to lose again... but I'm worried I'm doing something wrong.
Also, that equation works well for realizing how many calories you have to eat a day to maintain the weight you're at. I did mine at 300 pounds and it was terrifying! 4500 a day! EWWW!