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Family budget calculator
A birthday party budget is easy to blow because the costs arrive one small purchase at a time. This calculator lets you decide each category up front, then shows the total, the cost per guest, and a lower-to-higher range — so you're choosing the number instead of discovering it at checkout.
Estimated total
$541
about $27 per guest · 20 guests
Subtotal
$460
Tax
$32
Tip
$0
Contingency
$49
Planning range
$433 – $677
Real parties drift — aim for the middle and treat the higher end as the point to trim something.
These results are estimates for educational and planning purposes only — not guaranteed prices, savings, inspection results, or professional, financial, legal, or tax advice. Your actual costs will vary. For decisions about your home, consult a qualified professional.
Total = (Subtotal + Tax + Tip) × (1 + Contingency%)
A home party for 12 kids and 8 adults.
About $490 total, or roughly $24 per guest — with the contingency there to absorb a last-minute run to the store.
Every party is really a stack of categories: the space, the food, the cake, decorations, something for the kids to do, and favors to send home. Put a number on each one before you shop and the total stops being a surprise. Leave any category at zero and it simply drops out.
For most parties, food and entertainment are the two biggest levers. A venue rental can dwarf everything else, which is exactly why hosting at home or a free park changes the whole picture. Favors and decorations feel small per item but add up across a dozen kids.
No hidden 'averages' here
The total is your planning number; the cost per guest is the one that helps you decide the guest list. If per-guest feels high, trimming the list often saves more than cutting any single category.
The lower-to-higher range reflects how much real parties drift. Aim for the middle and treat the higher end as the point where it's worth trimming something.
Set the guest list first, decide each category up front, and keep a buffer for the last-minute extras.
Turn an amount into weekly, monthly, and yearly figures.
Plan the whole trip cost, per traveler and per day.
Plan the whole family's week on one printable page.
These results are estimates for educational and planning purposes only — not guaranteed prices, savings, inspection results, or professional, financial, legal, or tax advice. Your actual costs will vary. For decisions about your home, consult a qualified professional.
Reviewed by the TipParents editorial team · Last updated .