I'm trying to recreate those XL pizza you can get at most American pizza chains. Also, do I have to increase the measurements of the other ingredients (yeast and salt)? Thanks in advance.
12 inches is quite small, definitely not "XL". New York pizzas, very well-known for their size, are typically 18 to 24 inches in diameter. I think that'd be a good reference for an "XL" American pizza.
It's possible for this to be true and for their pizzas to be the same size if the size of the pizzas are 0 cm in radius. Then they have both eaten nothing.