How many pizzas for 15 kids?
Fifteen children is a typical half class invite. The count below assumes a party that runs through lunch, school age appetites, and five parents staying. Whole pizzas only, rounded up, because you cannot order a fraction.
The answer
15 children aged 6 to 9 and 5 adults, 12:00 PM for 2 hours.
6large pizzas
45 slices at 2 per child and 3 per adult, rounded up to whole pizzas. Two slices is the standard for school-age kids at a party.
SourcedSalerno's
Round up, then stop
There is a temptation to add a spare pizza on top of the rounding. Do not. The arithmetic already rounds a part pizza up to a whole one, so a spare on top is a second cushion on the same number. Cake follows the food, and the children know it.
This party runs through lunch, so plan a real meal.
The rest of the list for this party
| Amount | Item | Part of the party | Basis |
|---|---|---|---|
| 5 | Prepared fruit | Food | Sourced |
| 20 | Cupcakes | Cake | Our rule |
| 10 | Round cake (instead of cupcakes) | Cake | Sourced |
| 42 | Juice boxes and soft drinks | Drinks | Sourced and our rule |
| 20 | Water bottles | Drinks | Our rule |
| 38 | Plates | Table | Our rule |
| 60 | Napkins | Table | Our rule |
| 17 | Goodie bags | Favors | Our rule |
Your party is not this party
Change the guest count, the ages, the start time or the weather and the whole list moves. The calculator opens on the party above, so you can adjust it rather than start again.
Worth knowing
- Laying food out rather than plating it costs 10 to 15% more.
Where these numbers come from
- Planning the quantity food occasion, University of Minnesota Extension. Checked 2026-09-27.
- How much pizza do I need to order?, Salerno's Pizza. Checked 2026-09-27.
- Ultimate cake serving chart, Wilton. Checked 2026-09-27.
- Beverage math: how much to serve at your event, Plum Deluxe. Checked 2026-09-27.
- Accurate food and beverage quantity guide for your guests, Occasional Occasions Catering. Checked 2026-09-27.
Anything marked our rule is our own judgement rather than a published figure. We say which is which so you know which numbers to argue with.
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