Party math, settled
How much food do you actually need for a party?
The catering rules of thumb, worked out for 10, 25, and 50 guests — so nobody leaves hungry and you're not eating the same casserole for a week.
The one rule that makes the math easy
Plan per person, per category — then multiply. Party math goes wrong when you think in dishes (“two trays should be enough?”) instead of portions. A dinner-hour party needs a full meal’s worth per adult; kids 12 and under count as half a portion; and the more different dishes you serve, the smaller each portion gets, because people take some of everything.
The quantities, by guest count
These are the standard catering rules of thumb for a dinner-time party, assuming one main and 2–3 sides.
| What | Per adult | For 10 | For 25 | For 50 |
|---|---|---|---|---|
| Main protein (boneless, raw) | ½ lb | 5 lb | 12–13 lb | 25 lb |
| Main protein (bone-in, raw) | ¾ lb | 7–8 lb | 18–19 lb | 37 lb |
| Each side dish (2–3 total) | 4 oz | 2½ lb | 6¼ lb | 12½ lb |
| Green salad | 1 cup | 2½ qt | 6 qt | 12 qt |
| Rolls or bread | 1½ pieces | 15 | 38 | 75 |
| Appetizer bites (before dinner) | 4–6 pieces | 50 | 125 | 250 |
| Dessert | 1 slice / 2 cookies | 1 pie or 20 cookies | 3 pies or 50 cookies | 6 pies or 100 cookies |
| Ice | 1–1½ lb | 15 lb | 35 lb | 70 lb |
| Non-alcoholic drinks | 2–3 servings | 25 cans | 65 cans | 125 cans |
| Wine (if serving) | ½ bottle | 5 bottles | 12 bottles | 25 bottles |
| Beer (if serving) | 2–3 bottles | 24-pack | 60 | 120 |
Wine and beer overlap — don’t buy both columns in full. A common split for a mixed crowd: half wine, half beer, and a quarter of everyone on neither. One drink per person per hour is the pace to plan around.
Adjustments that actually matter
- Buffets eat more. Self-serve portions run 10–15% over plated. A buffet for 25? Shop like it’s 28.
- Time of day sets expectations. A 6–8pm party means dinner, full stop. A 2pm open house can be appetizers and dessert — 8–12 bites per person across the afternoon.
- Kids count as half. Ten adults and four kids is twelve portions, not fourteen.
- Long parties need a second wind. Past three hours, plan an extra round of drinks and a late snack.
- Leftovers are a choice. These numbers leave modest extras. If sending people home with plates is the goal (it’s a good goal), add 20%.
Quick answers
How much meat for 25 people?
About 12–13 lb boneless (raw weight) if it’s the only main, or 18–19 lb bone-in. Two mains? Split the total across both — don’t double it.
How many pizzas for 25 people?
Ten large 16-inch pizzas (8 slices each) covers 25 adults at 3 slices apiece with a small buffer. With substantial sides or salad, eight is enough.
How much ice for a party of 25?
About 35 lb — more in summer or outdoors. It’s the most under-bought item at every party; when in doubt, one more bag.
How much should I make versus buy?
Above about 15 guests, buying a course or two outright (bakery dessert, a deli platter) is what keeps the day sane. Spend your effort on the one dish people will remember.
Or skip the math entirely.
Tell Dinner Caddy your headcount and what you feel like making — it builds the menu, scales every quantity to your exact guest list, and writes the shopping list and prep schedule. Free, no account.
Plan my party free →