Mixed family party
How many pizzas for 10 adults and 5 children?
With average appetites and pizza as the meal, the tool recommends 5 large pizzas: about 37 slices including a four-slice buffer.
Feed the whole table
Pizza Calculator
Figure out how many pizzas to order without panic-math at the checkout screen.
What's under the hood
How this tool thinks
We start with typical slice estimates for adults and children, adjust for appetite and whether pizza is the whole meal, then add a small practical buffer.
Restaurants cut pizzas differently, so the selected slice count is explicit instead of pretending every large pizza is identical.
Worth knowing
Useful in the real world
- Ask the restaurant how many slices come in each size.
- Round up for very long events, teenagers, or uncertain attendance.
- For groups above 150, confirm capacity and lead time with the restaurant.
Try it on paper first
Worked examples
Real inputs, real outputs, and the assumption that changes the answer.
Hungry crowd
What about 20 hungry adults?
Plan on 10 large pizzas. The estimate expects about 70 slices eaten and adds seven more as a cushion.
Appetizers doing real work
What changes when there is substantial other food?
For 12 average-appetite adults, the recommendation drops from 5 to 4 large pizzas.
“Other food” means substantial appetizers or another main—not one decorative bowl of chips.
Short answers
Questions people actually ask
How many slices should I plan per adult?
Three large-pizza slices is a useful middle estimate when pizza is the main meal. Light eaters may have two; hungry adults may have four.
How does the calculator count children?
Children are estimated at roughly one to two-and-a-half slices depending on appetite. You know your group best, so adjust the appetite setting when needed.
Is the extra buffer wasteful?
The buffer is intentionally modest—usually around 10%. It protects against uneven appetites without doubling the leftovers.