12-inch pizzas are probably the most common and many people work out the weight of the dough as well as the dough per square inch using pi (3.14) to calculate the surface area. The calculations can be confusing, but for a 12-inch pizza, you will need to do the following;
3 14 x 36 = 113.04
113.04 is the overall surface area, but this still does not tell us the weight of the dough we will need to make our pizza. Most pizza experts will tell you that you need to experiment to find the ideal weight, but a good starting point would be to use one ounce of dough for every square inch. You should add or take away dough weight until you feel happy with the pizza, but you must turn back to the calculator again.
This time, we must work out the sum of the dough weight and the surface area of the pizza pan to tell us the dough loading; this is essentially how much dough per square inch of the pan. You can do this by taking the dough weight and dividing this by the surface area of the pizza pan. For this example, we will assume that you are using 10 ounces of dough.
10 divided by 113.04 = 0.0884642 so this tells us that we must use 0.0884642 ounces per square inch for a 12″ pizza recipe.