Free tool
How much food for a kids birthday party?
Tell it who is coming and when. It works out the food, cake, drinks and supplies, and shows you where each number came from. Anything we decided ourselves is labelled as ours, so you know which figures to argue with.
This is a snack party, not a meal.
24 children aged 6 to 9 and 2 adults, 2:00 PM for 2 hours.
Food
Snack portions (portions)
This party misses lunch and dinner, so snacks and cake are enough. Ordering a full meal here is the most common overspend.
Our rule
Cake
Pick one, not both.Cupcakes (cupcakes)
24 for the children plus 2 spares, and about half the 2 adults take one.
Our rule
Round cake (instead of cupcakes) (inch round)
A 12-inch round covers 32 party slices, enough for 25. Party slices are the larger cut. The wedding column of the same chart would claim far more from this tin.
SourcedWilton
Drinks
Juice boxes and soft drinks (drinks)
One cup per child per hour over 2 hours, minimum 2 each, plus 0.75 an hour for the adults, then a 10% buffer.
Sourced and our rulePlum DeluxeOccasional Occasions
Water bottles (bottles)
One water each, for the parents and the kids who have had enough sugar.
Our rule
Table
Plates (plates)
Two each: one for food, a clean one for cake. Most parents use one plate, some take cake on a second.
Our rule
Napkins (napkins)
Three each. Frosting.
Our rule
Favors
Goodie bags (bags)
One per invited child plus 2 spares. Two spares for younger siblings who come along and expect one.
Our rule
Where these numbers come from
- Planning the quantity food occasion, University of Minnesota Extension. 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, not a published figure. We say which is which so you can disagree with the right one.
Why the start time matters more than the guest count
The most expensive mistake at a kids party is ordering a meal for a party that does not span one. A two o’clock party that runs two hours misses lunch and misses dinner. The children have eaten and will eat again; what they need is something to pick at and a slice of cake.
So this calculator asks when the party starts and how long it runs, then checks whether it genuinely overlaps a mealtime by three quarters of an hour or more. If it does, you get a pizza count. If it does not, you get snacks, and you keep the money.
Where the numbers come from
Every quantity is one of two things, and the page says which. A sourced number is traced to a published catering or industry reference, linked at the bottom of your list. An our rule number is our own judgement. There is no third category, and nothing is invented quietly.
The labels are not decoration. A published figure can still be wrong for your party if it was measured somewhere else. The standard drinks figure, for instance, comes from adult social events, and applying it to a room of parents supervising six-year-olds suggests almost four drinks each. We halved it, and the page marks that line as ours rather than borrowing someone else’s authority for a number they did not publish.
A few things it deliberately does not do
- It does not price anything. Prices vary by state and by week, and a number that goes stale is worse than no number.
- It does not ask about allergies or dietary needs. Those are not arithmetic, and a calculator that pretended otherwise would be dangerous.
- It assumes American sizes throughout: large pizzas cut into eight, Wilton round tins, pounds of fruit.
Common questions, already worked out
If your party is close to a standard one, the answer pages have it costed already: pizza for fifteen or twenty children, cake sizes by head count, drinks for an outdoor party in the heat, goodie bags for a whole class. Each one opens here so you can change it.