Hi, I'm rubbish at estimated quantities of food, and I don't usually get takeaway pizzas, but they have been requested as a bday treat. Takeaway pizzas at our local place are 11" or 14". What would you get for 4 12yr old girls? They have all eaten here before, and none with a massive appetite. I could put some fries in the oven as well, and loads of treat food (cake, popcorn etc) for afterwards.