This seems to go against all logic, but…. apparently someone way smarter than me did the math and you actually get more pizza per square inch from an 18″ pie then from two 12″ pies. According to Fermat’s Library on Twitter, an 18″ pizza yields 254 square inches of pizza while 2 12″ pizzas only offers 226.
At some point in life, this info will come in handy. You’re welcome. 😉