How much does a kids birthday cost? A 12-guest example (2026)
For example, a home birthday for 12 guests typically costs about $290 all-in ($24 per guest), including Extra buffer.
That total is about $0 for the home, $60 for the pizza, $40 for the cake, $30 for the drinks and snacks, $40 for the decorations, $30 for the games / activities, $60 for the favors, and $30 for Extra buffer.
Extra buffer is spare money on top if something runs over. It is already inside that $290. This example is a home birthday. It is not a paid venue party, and it is not a sleepover.
The example in one table
This is one mid-range example for the United States. Shares are rounded; the dollars are the source of truth. Source: Project ROI Calc Standard estimate, United States, 2026.
| Line | Dollars | Share of all-in |
|---|---|---|
| Home | $0 | 0% |
| Pizza | $60 | 21% |
| Cake | $40 | 14% |
| Drinks and snacks | $30 | 10% |
| Decorations | $40 | 14% |
| Games / activities | $30 | 10% |
| Favors | $60 | 21% |
| Extra buffer | $30 | 10% |
| All-in | $290 | 100% |
Walkthrough
Home — $0
This example leaves Home at $0. Change it on the calculator if you will spend here.
Pizza — $60
Pizza is $60 in this example. Change it on the calculator if your quote is different.
Cake — $40
Cake is $40 in this example. Change it on the calculator if your quote is different.
Drinks and snacks — $30
Drinks and snacks is $30 in this example. Change it on the calculator if your quote is different.
Decorations — $40
Decorations is $40 in this example. Change it on the calculator if your quote is different.
Games / activities — $30
Games / activities is $30 in this example. Change it on the calculator if your quote is different.
Favors — $60
Favors is $60 in this example. Change it on the calculator if your quote is different.
Extra buffer — $30
Extra buffer ($30) is spare money on top if something runs over.
All-in vs per guest
People quote both. All-in ($290) is money to have on hand for a home birthday. Per guest ($24) is for comparing catering menus or grocery lists. This page does not add a third “average.”
What would change your number
- A different guest count
- A nicer or simpler pizza
- A quote you already have from a vendor
Change those amounts on the calculator — do not add a mental extra percent on top of Extra buffer.
Not in this number
- Guest gifts and the host's outfit
- Travel
- Sales tax if a vendor puts it on the invoice
If you add a bounce house for the kids party, price that rental separately — not part of this hosted estimate.
Bounce house rental cost calculator
How to use the calculator
- Enter how many guests you are hosting. This example starts at 12.
- Open a cost row and tap a starting-price button, or type the quote you already have.
- Tap Calculate. The all-in and per-guest figures update together.
Frequently asked questions
How much does a 12-guest kids birthday cost?
This example is $290 all-in for 12 guests ($24 per guest), including Extra buffer. Extra buffer is spare money on top if something runs over. That is a home birthday.
What is included in this $290?
Every line in the table, plus Extra buffer. Items listed under “Not in this number” are left out on purpose.
Do I have to keep Extra buffer?
No. Extra buffer is spare money on top if something runs over. You can lower it or zero it on the calculator. Do not add a mental extra percent on top of it.
What if I invite more guests?
Raise the guest count on the calculator. Food and per-person lines usually move with the list. The $290 figure here stays this example.
Related
How much does a kids venue party cost?How much does a first birthday cost?All event cost calculators