Six ounces of cooked meat, 10 to 12 ounces of sides, a roll and a half, one dessert, and one drink per hour. That is one adult at a gathering, and every party plan, from a seated dinner for six to a backyard buffet for forty, is that plate multiplied by the head count and then adjusted for the format. This guide is organized as a lookup. Find the course, take the per-person figure, multiply by your guest list, and read the adjustments section before you shop.

Quick answer: Plan 6 ounces of cooked protein, 10 to 12 ounces of sides split across two or three dishes, and one dessert serving per adult, plus one drink per guest per hour. To end up with 6 cooked ounces, buy 8 ounces of raw boneless meat or 12 to 16 ounces bone-in. Add a 10 to 15 percent buffer, and count children under ten as half portions.

Main courses: the anchor number

Every other quantity hangs off the protein, so settle it first. An adult with a normal appetite eats about 6 ounces of cooked meat or fish when sides share the plate. Meat loses roughly a quarter of its weight in cooking, and bones add weight nobody eats, which is why the shopping numbers below run higher than the eating number.

  • Boneless chicken, pork, or beef: 8 ounces raw per person.
  • Bone-in chops or chicken pieces: 12 ounces raw per person.
  • Whole birds: 1 to 1.25 pounds raw per person, so two 4-pound chickens cover six or seven guests.
  • Bone-in roasts and ham: 12 ounces to 1 pound raw per person.
  • Ground meat: 6 ounces per person, which means a run of quarter-pound burgers should assume one and a half patties per adult.
  • Fish fillets: 6 ounces per person.
  • Peeled shrimp as a main: 5 ounces per person.
  • Pasta as the main course: 4 ounces dry per person. As a side or first course, 2 ounces.

When you offer two mains, guests sample both, so make two-thirds of the normal quantity of each rather than a full run of both. For a table of teenagers or people who work on their feet, move the cooked target from 6 ounces to 8 and scale the raw numbers to match.

Sides, starches, and salad

Budget 10 to 12 ounces of finished side dishes per plate, split across everything you serve. With three sides, that is about 4 ounces each. The budget is per plate, not per dish, so adding a fourth side means smaller portions of the other three and a smaller batch of each.

  • Mashed potatoes: half a pound of raw potatoes per person.
  • Rice and grains: one-third cup dry per person, which cooks up to a generous cup.
  • Pasta or potato salad: 4 ounces finished per person. People take less cold starch than hosts expect.
  • Roasted or steamed vegetables: 5 to 6 ounces raw per person to land at 4 on the plate, because vegetables shrink too.
  • Green salad: a fistful of greens per person, about 1 ounce, with 2 tablespoons of dressing. Double it when salad is its own course.
  • Corn on the cob: one ear per person.
  • Baked beans and other braised sides: half a cup per person.

Field note: When a quantity is in doubt, overshoot in the dishes that keep. Extra rice, beans, or braise reheats into two days of lunches. Extra dressed salad and anything fried are garbage by midnight, so those get exact counts, and the surplus gets planned into something that reheats.

Appetizers and snacks

Appetizer math depends entirely on whether dinner follows.

  • Before a dinner: 4 to 6 bites per person, total, from two or three kinds at most. Their job is to bridge the arrival gap, and every bite past six comes directly out of the meal you cooked.
  • A cocktail party that replaces dinner: 10 to 12 bites per person across the evening, from six to eight kinds, with at least two substantial enough to pass for food. Front-load the platters, since guests eat most of their total in the first 90 minutes and mostly drink after that.
  • Cheese: 2 ounces per person on a mixed spread, 4 ounces when cheese is the centerpiece.
  • Cured meats: 2 ounces per person.
  • Dips: 3 tablespoons per person, with 2 ounces of chips or crackers alongside.
  • Cut vegetables: four or five pieces per person. Leftover crudité is a near certainty, so buy the small tray.

Placement changes consumption. A bowl at the center of conversation disappears; the same bowl on a side table survives the night. Put the cheap snacks within reach and the expensive ones a step away.

Bread and dessert

  • Rolls: one and a half per person, with a tablespoon of butter each. Sliced loaves: two slices per person.
  • Layer cake: a 9-inch round serves 12. A quarter sheet cake serves about 20.
  • Pie: one 9-inch pie serves 8.
  • Cookies and brownies: two or three pieces per person.
  • Ice cream: a half-cup scoop per person. One gallon covers about 30 scoops.

Plan one dessert serving per adult plus a small margin, and stop there. Dessert arrives when everyone is already full, which makes it the worst place to overbuy. If you offer two desserts, guests take a sliver of each, so make two-thirds of each, the same rule as double mains.

Drinks and ice

The baseline is one drink per adult per hour, whatever the drink is.

  • Wine: a 750 ml bottle pours five glasses. At a dinner party, plan half a bottle per wine drinker across the evening.
  • Beer: one 12-ounce bottle or can per beer drinker per hour.
  • Spirits: a 750 ml bottle makes about 16 mixed drinks. A batched cocktail in a pitcher turns the math into a self-serve station and frees the host.
  • Nonalcoholic: two servings per guest in the first hour, one per hour after, counted for every guest, since wine drinkers also empty the water pitcher. A 2-liter bottle holds eight servings.
  • Coffee: after dinner, a cup for about half the table covers the takers.
  • Ice: 1 pound per guest when drinks are chilled in the refrigerator. Double it when bottles sit in coolers or the party is outdoors.

Buy one extra bottle of whatever the crowd favors. An unopened backup goes back on the shelf; running dry at hour two does not.

Adjusting for format and crowd

The per-person figures are the base. The format bends them.

  • Buffets: add 15 to 20 percent to mains and starches. People serve themselves generously the first time through, and some come back.
  • Plated meals: cook to exact counts plus two spare portions. A plated dinner is the cheapest format per head because you decide the plate.
  • Big spreads: the total plate stays the same size no matter how many dishes are on the table. Eight dishes means smaller batches of each, never eight full recipes.
  • Between-meal hours: a mid-afternoon open house eats far less than a dinner-hour crowd. Drop the mains entirely and run cocktail-party appetizer numbers instead.
  • Children: under ten, half portions of everything except dessert, where they are full participants. Teenagers count as adults, plus extra starch.
  • Cookouts: outdoor and informal both push consumption up, so plan one and a half to two burger patties per adult, with buns to match.

These quantities produce a shopping list, and a shopping list is the middle of the job. For menu selection at a seated party, see planning a dinner for eight; turning the finished list into a cooking schedule is the work of the dish timing guide.

Frequently asked questions

How much food does a party of 20 need? Using the base figures: 10 pounds of raw boneless protein, 12 to 15 pounds of finished sides split across three dishes, 30 rolls, and about 22 dessert servings, plus one drink per guest for each hour of party. Add the buffet bump if guests serve themselves.

Is it better to make too much or too little? Too much, by 10 to 15 percent, and no more than that. Park the surplus in dishes that reheat and the overage becomes lunches instead of waste.

Do potluck dishes count toward the totals? Yes. Count each contribution as one side, keep the main course and its quantity under your own control, and assign categories when you invite, because five uncoordinated guests will produce four desserts and no vegetables.

How do you scale a recipe that serves 6 up to 15? Multiply the solid ingredients by 2.5 and round the protein up. Hold salt, spice, and hot pepper at double, then adjust at the stove. Seasoning does not scale in a straight line, and an oversalted pot for 15 has no fix.

The whole method is one plate, multiplied. Fix the per-person plate, multiply by the guest list, bend the total for the format, and park the planned surplus in dishes that reheat. Nobody at the table notices accurate portion math, which is the point. The food lasted, nobody counted, and the fridge holds tomorrow’s lunch instead of a garbage bag of salad.