How Many Cal. a day should a 16 year old girl have a day?

Answer 1

find calorie/fitness calculator on the net, enter your stats and it will tell you how many calories a day you need to maintain your weight.
eat 5-6 small meals a day instead of 3 big ones.
5-8 servings of fruit and vegetables a day.
8 glasses of water a day.
no junk food, no sodas, no white flour (white bread, pasta, cookies, cakes etc)

Answer 2

around 1500 but probably more than that if you are active.