diet.. how many calories a day?

i could do with losing a bit of weight... trying to be sensible with what i eat as my drinking has increased! (cant cut down on drink so need cut down on food and increase excercise!!)

so was wondering whats the calorie intake for a man supposed to be per day?

any other tips? cant be bothered with a full on diet atkins etc.. only got a bit of excess as im too busy to do much at gym at mo!