Let's consider American pizza sizes: a small pizza (12 inches) has a surface area of 113 square centimeters. A large pizza (16 inches) has a surface area of 201.06 square inches. As you can see, a large pizza has nearly double the amount of pizza than a small one. But, if you take a look at the price difference between the two, a large pizza is marginally more expensive. You will get more bang for your buck when ordering a large pizza instead of two smalls.