Calculate exactly how many pizzas you need for your party
For 10 adults with average appetites, plan on about 3-4 large pizzas (14 inches). Each large pizza typically has 8-10 slices, and adults eat 2-3 slices on average. If serving side dishes, you can reduce to 3 pizzas. For hungry crowds or if pizza is the only food, go with 4-5.
Larger pizzas almost always offer better value per square inch. A 14-inch large pizza has about 154 square inches of pizza, while two 10-inch small pizzas only total 157 square inches but cost significantly more. The area of a circle grows with the square of the radius, so even small increases in diameter add substantial pizza area.
A good rule is 1/3 cheese (safe for vegetarians), 1/3 pepperoni or meat (most popular topping), and 1/3 specialty or veggie options. Ask guests about allergies and dietary restrictions beforehand. Always include at least one vegetarian option, and consider a gluten-free pizza if anyone has celiac disease or gluten sensitivity.