Most large pizzeria pizzas, measuring 14 to 16 inches in diameter, feed approximately four to eight people, depending on how many slices each person eats. Large pizzas typically contain eight to 12 triangular slices or 10 to 12 square slices.
Homemade pizza kits, such as the Chef Boyardee Pizza Maker, make approximately eight 4-ounce slices. The average adult eats approximately two to three slices of pizza, while children eat one to two slices each. Those with larger appetites, such as teenagers, may consume up to four slices of pizza in one sitting.
When planning a pizza party, consider the ages, appetites and dietary restrictions of the guests and also whether other foods will be served with the pizza to determine how much should be prepared or ordered.