Skip to content
Redmoon Calculators
Home, tech & everyday

Catering & Party Food Quantity Calculator

Calculate protein, starch, vegetable, and salad quantities for a sit-down or buffet meal, or total appetizer pieces per variety for a cocktail-style party.

Built and maintained by Paul Clark, Redmoon Software

When to use this

Use this when ordering or cooking for a sit-down or buffet meal, or when planning total appetizer pieces for a cocktail-style party, to buy or prep the right quantity for your guest count.

How it compares

Unlike a flat “X pounds of food per person” rule, this calculator breaks quantities down by food category for a meal, or by piece-count per appetizer variety for a cocktail party, matching how caterers actually plan and order.

Enter your values below. Calculations run locally as you type.

Event

Shopping list

Protein
18.8 lb
Starch
15.6 lb
Vegetables
12.5 lb
Salad
9.4 lb

For 50 guests, plan on roughly 18.8 lb of protein, 15.6 lb of starch, 12.5 lb of vegetables, and 9.4 lb of salad.

How it works

For a sit-down or buffet meal, the calculator multiplies your guest count by industry-standard ounces-per-person figures for protein, starch, vegetables, and salad, then converts ounces to pounds.

For a cocktail-style party, it multiplies guest count by pieces-per-person-per-hour and the event duration to get total appetizer pieces needed.

That appetizer total is then divided evenly across however many distinct appetizer varieties you are offering, so you know how many of each dish to prepare.

FAQs

Buffet vs. plated — do portion sizes differ?

Buffets tend to run slightly higher per-person because guests can and do take seconds, and portion control is looser than a plated meal. The default ounces per person here are reasonable for either style but lean toward buffet-safe.

How much extra should I buy as a safety buffer?

A common rule of thumb is to add about 10% extra food beyond the calculated total, to cover larger appetites, unexpected guests, and to avoid running out before the event ends.

How should I plan around dietary restrictions?

Ask guests about dietary restrictions in advance whenever possible. Regardless of what you learn, it is good practice to offer at least one vegetarian and one gluten-free option at any size event.

Worked example

Input

50 guests, buffet meal at 6oz protein / 5oz starch / 4oz vegetables / 3oz salad per person.

Output

Protein: 18.75 lb. Starch: 15.6 lb. Vegetables: 12.5 lb. Salad: 9.4 lb.

Each per-person ounce figure is multiplied by the guest count and converted to pounds (÷16). At 6oz of protein per person, 50 guests need 300oz, or 18.75 lb.

Common pitfalls

  • Not adding a safety buffer — a common rule of thumb is about 10% extra — risks running out before every guest is served.
  • Using plated-meal portion sizes for a buffet (where guests take seconds) can undercount how much food is actually consumed.
  • Skipping dietary planning for vegetarian and gluten-free guests can leave some attendees with nothing to eat, even at a well-quantified event.

Portions by weight, before cooking losses

The defaults are standard catering portions per guest: 6 oz protein, 5 oz starch, 4 oz vegetables, 3 oz salad for a seated meal. Those are served weights, which is the number that matters to a guest and not the number to buy.

Raw-to-cooked yield is the gap. Meat loses roughly 25% of its weight in cooking, and bone-in cuts lose more again to the bone, so 6 oz served can mean 9 oz or more purchased. Buying to the served figure is the most common way a catering order falls short.

Adjusting for the event rather than the guest count

Duration changes consumption more than headcount does. A two-hour reception and a five-hour party with the same guests are different orders, particularly for anything grazed rather than plated.

Two further adjustments are worth making deliberately. More choices means more total food, not less — guests take some of each rather than choosing one, so a buffet with six options needs more than one with three at the same headcount. And the crowd matters: a mixed-age gathering eats noticeably less per head than a room of young adults, and the standard figures sit closer to the latter.

Read more about this

· 7 min read

When to bump the numbers: adjusting party food quantities for your actual event

Standard per-person food figures assume an average event. A lunch, a drinking crowd, an all-buffet spread, or a long cocktail party each pull the numbers in a different direction — here is how to adjust.
· 6 min read

How much food to order for a party: a per-person breakdown

Real per-person ounce figures for protein, starch, vegetables, and salad at a sit-down or buffet meal, and pieces-per-person-per-hour math for a cocktail party — with worked examples for both.

Related tools

Home, tech & everyday

EV Charging Cost & Road Trip Calculator

What EV charging really costs — and how it stacks up against gas.

 Home, tech & everyday

PC Build Wattage & PSU Calculator

Size your PSU from your actual parts list, not a guess.

 Home, tech & everyday

3D Printer Electricity Cost Calculator

What your 3D printer actually costs to run, including standby draw.

 Home, tech & everyday

Solar Generator Runtime Calculator

How long your portable power station will actually last.

Send feedback

We read every message. Tell us what could be better or what you love.