A 14 inch pizza is usually considered a large pizza and is sliced into 8 equal slices. The total area of a 14 inch pizza is approximately 154 square inches. However, the number of slices in a 14 inch pizza can vary depending on the pizza supplier, and some pizza places may cut their slices larger or smaller than others. In general, a 14 inch pizza can serve 3-4 adults. If you are trying to determine how many pizzas to order for a group, a large 14 inch pizza will offer approximately 10 slices.