How many large pizzas do I need?

The formula we use to estimate the number of pizzas required for large groups is: 2.5 slices per person divided by 8 slices per large pizza. Example: If you have 30 people in your group: 30 people x 2.5 slices of pizza each (30 x 2.5 = 75 slices) divided by number of slices of pizza in a large = 75 / 8 = ~ 10 large pizzas for 30 people.