Homemade 12-inch pizzas require about 3 tablespoons of pizza sauce. This is a little less than the amount used commercially due to the longer baking time needed because of the lower temperature of the home oven. While the amount used is based on personal preference, it is better to be safe and use a little less sauce, as too much will result in a soggy, undercooked bottom crust. 6-inch pizza: 2 teaspoons 10-inch pizza: 2 Tablespoons 12-inch pizza: 3 Tablespoons 14-inch pizza: 4 Tablespoons 16-inch pizza: 6 Tablespoons 18 inch pizza: 7 Tablespoons