How we calculate
Every quantity on Food Per Person comes from the per-person rates and adjustments below. These are standard catering and host planning figures, cross-checked against the sources at the end of this page. They are planning estimates, not exact requirements; the tools let you adjust every assumption to match your event. Rates are versioned in the site and never fetched live, so a number does not change under you between visits.
Per-person food rates
Each rate is per adult at a standard appetite for a roughly three-hour event, before the adjustments below. Children are counted at a fraction of an adult portion (about half for mains, more for drinks and disposables).
| Item | Per adult | Basis |
|---|---|---|
| Main protein (burgers, chicken, pulled pork) | 0.5 lb | Caterers plan about 0.5 lb cooked main protein per adult at a buffet (standard catering guidance). |
| Vegetarian main (skewers, plant patties) | 0.4 lb | About 0.4 lb of a hearty vegetarian main per veg guest (standard catering guidance). |
| Starchy side (potato salad, pasta, rice) | 5 oz | Plan about 4 to 5 oz per adult per side; two sides is typical (catering guidance). |
| Vegetable side or green salad | 3 oz | About 3 oz of salad or vegetables per adult alongside a starchy side (catering guidance). |
| Buns or bread rolls | 1.5 pieces | 1.5 buns per adult covers seconds and a few extras (host guidance). |
| Chips and snacks | 2 oz | About 2 oz of snacks per adult for a standard event, scaling with length (host guidance). |
| Appetizers and finger food | 5 pieces | Plan about 5 pieces per guest in the first hour and 3 per hour after when food is the main event (catering guidance). |
| Dessert servings | 1 servings | One dessert serving per guest, with a small buffer baked into the buffer toggle (host guidance). |
| Condiments and sauces | 1 servings | One condiment serving per adult; one squeeze bottle or jar covers roughly 10 guests (host guidance). |
| Plates, napkins, cutlery sets | 2 pieces | Two place settings per guest covers a dropped plate and a dessert round (host guidance). |
| Tortillas or taco shells | 2.75 pieces | About 2.5 tacos per adult plus a few for breakage, roughly 2.75 tortillas each (host guidance). |
| Taco meat (seasoned, cooked) | 0.33 lb | About one third of a pound of cooked taco filling per adult covers two to three tacos (catering guidance). |
| Beans (vegetarian filling) | 4 oz | About 4 oz of beans per vegetarian guest as the taco filling (host guidance). |
| Shredded cheese | 1.5 oz | About 1.5 oz of shredded cheese per adult across the taco bar (host guidance). |
| Toppings (lettuce, tomato, onion, salsa, sour cream) | 4 oz | Roughly 4 oz of combined fresh toppings and salsa per adult (host guidance). |
Per-person drink rates
The planning rule is one drink per drinking guest per hour. Of the alcoholic drinks, about half are beer, a third wine, and the rest spirits; everyone also gets soft drinks or water. Bottles and cans are worked out from how many servings each unit pours.
Beer
Of alcoholic drinks, about half are beer at a mixed party (host guidance).
Wine
About 30 percent of alcoholic drinks are wine; a 750 ml bottle pours roughly 5 glasses (host guidance).
Cocktails and spirits
About 20 percent of alcoholic drinks are spirits; a 750 ml bottle makes roughly 16 cocktails (host guidance).
Soft drinks and juice
Non-alcoholic drinkers average about one soft drink per hour (host guidance).
Water
Always plan water for every guest, roughly half of non-alcoholic servings (host guidance).
The adjustments
- Appetite
- Food-related rates are multiplied by appetite: light 0.8, standard 1, big eaters 1.25.
- Duration
- Snacks and grazing scale with event length. Appetizers follow the documented pattern of about 5 pieces per guest in the first hour and 3 for each hour after.
- Kids share
- Each child is counted at a fraction of an adult portion per item (roughly half for mains), while plates, drinks, and dessert stay close to a full count.
- Dietary mix
- The vegetarian share moves that fraction of the main protein to a vegetarian main or beans, rather than leaving plant-based guests with sides only.
- Service style
- Buffets are sized at the base rate; plated service trims it slightly; grazing-style spreads add a little, since guests pick at food over a longer window.
- No-show buffer
- An optional buffer (about 10 percent is typical) raises the effective headcount to cover extra guests and second helpings without large leftovers.
How we estimate cost
Cost is the sum of each item, its quantity times an average US grocery unit price reviewed June 2026. It is a planning aid, not a quote. Real prices vary by region, store, brand, and season, so treat the total as a ballpark.
The price level in the tool advanced options tunes the whole estimate to how you shop: Budget is about 0.8x the baseline, Average is the baseline, and Premium is about 1.35x. Non-USD currencies convert the US prices at a rough parity factor, not a live local price feed, so a non-USD total is an approximate guide. Exact per-item price editing is on the roadmap.
Sources
- WebstaurantStore, Catering Portion Size Guide: buffet food per person, protein and side portions
- The Old Farmer's Almanac, Party Planner Serving-Size Chart: quantity-per-crowd reference for 25 to 100 guests
- Reventals, Party Drink Calculator guide: one drink per guest per hour and the beer/wine/spirits split
- What's Cooking America, Appetizer Amounts Per Person: about 5 appetizers in the first hour, 3 per hour after
Where a figure is a common industry rule of thumb without a single authority, the basis note says so. See the tools in action on the calculators.