Family of 3 or 4, definitely 4 if your adding sides like breadsticks or whatever
You can easily feed a family of 3 with a large pizza
It all depends on personal eating habits. Domino's has a small large at only 14 inches. Where as a pizza from Giacomo's Upper Crust is 16 inches for a large pizza. There are even some pizza places that consider an 18 inch pizza a large pizza.
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