How to Calculate Catering Quantities for Any Event: Food, Drinks, and Supplies Per Person

Ordering too little food for an event leaves guests hungry. Ordering too much wastes money and creates food waste. Getting catering quantities right is a math problem — and once you know the per-person formulas, you can calculate confidently for any event size. This guide covers food, drinks, ice, plates, and utensils based on industry-standard catering ratios.

Use the Basic Math Calculator to multiply these per-person amounts by your guest count for instant totals.

Food Quantities Per Person (Standard Portions)

Food Type	Per Person	Notes
Main dish (meat/poultry)	6-8 oz	8 oz for bone-in cuts (chicken legs, ribs)
Main dish (fish)	6 oz	Fillet portion, skin-on or off
Side dishes	4 oz each	2-3 sides per person recommended
Salad	2 cups	Includes dressing
Bread/rolls	1.5 per person	Round up for heavy bread baskets
Appetizers (light meal)	6-8 pieces	If appetizers are the main food
Appetizers (pre-dinner)	3-5 pieces	Before a seated meal
Dessert	1 slice or serving	Cake, pie, or individual dessert
Fruit platter	4-6 oz	Mixed fresh fruit, sliced

Drink Quantities Per Person

Beverage	Per Person (2-hour event)	Per Person (4+ hour event)
Water (bottled)	1 bottle (500ml)	2 bottles
Soda / Soft drinks	2 cans	3-4 cans
Coffee	1 cup	2 cups
Tea (iced)	1 glass	2 glasses
Beer	2 bottles/cans	3-4 (for drinking guests)
Wine	1 glass (5 oz)	2-3 glasses
Full bar (mixed drinks)	2 drinks	3-4 drinks

For drink quantities, estimate that 20-30% of guests do not drink alcohol. Calculate based on the number of drinking guests, not total guests. Use our Volume Converter to scale between bottles, liters, gallons, and cups.

Catering Math for a 50-Person Event (Example)

Item	Per Person	Total for 50
Chicken breast (boneless)	8 oz	400 oz = 25 lbs
Rice pilaf	4 oz	200 oz = 12.5 lbs (dry)
Roasted vegetables	4 oz	200 oz = 12.5 lbs
Garden salad	2 cups	100 cups = 6.25 gallons
Dinner rolls	1.5	75 rolls
Bottled water	2	100 bottles
Soda cans	3	150 cans
Wine (drinking guests only)	2 glasses (5 oz)	35 guests × 10 oz = 350 oz = ~14 bottles
Coffee	1 cup	50 cups = ~3 gallons

Supplies and Serving Equipment

• Plates: 1.5 per person (some guests take seconds or dessert plates). For 50 people: 75 plates.
• Forks: 2 per person (main + dessert). For 50 people: 100 forks.
• Napkins: 2 per person. For 50 people: 100 napkins.
• Cups: 1 per person per drink type. For 50 people with water + wine + coffee: 150 cups.
• Ice: 1 lb per person for beverages. For 50 people: 50 lbs of ice.

Temperature and Timing Tips

Hot food should be held at 140°F (60°C) or above. Cold food should stay below 40°F (4°C). Use our Temperature Converter to switch between Fahrenheit and Celsius for oven settings and food safety checks. The general rule is: plan 30-45 minutes of serving time per 100 guests for a buffet line.

The 20% Rule

Always add 20% to your final quantities. Some guests eat more than average, some arrive unexpectedly, and you want leftovers (especially for non-perishables). Multiply your final totals by 1.2 using the Basic Math Calculator to get your order-ready numbers.