Catering Calculator: Plan Food Quantities for Any Event Size
Calculate exact food quantities for catered events by guest count, meal type, and event style. Minimize waste and avoid running short at weddings, corporate events, and parties.
Catering math is all about not running out of food (disaster) or over-buying so much that the waste is embarrassing (expensive disaster). The CalcHub Catering Calculator helps you calculate quantities for any guest count, event style, and meal type — whether it's a plated dinner, buffet, cocktail reception, or backyard party.
The Fundamental Rule: It Depends on the Event Style
Buffets require more food than plated service. Cocktail parties need far less than seated dinners. Lunch events typically see less consumption than dinner events. Time of day and event formality are the two biggest predictors of how much people eat.
| Event Type | Per-Person Food Amount |
|---|---|
| Formal seated dinner | 6–8 oz protein, 4–5 oz each of 2–3 sides |
| Casual buffet | 20–30% more than plated (people go back for seconds) |
| Cocktail party (2 hrs, no dinner) | 8–12 bite-sized appetizers per person |
| Cocktail party (before dinner) | 4–6 appetizers per person |
| Brunch | 6 oz protein, 2–3 lighter sides |
| Lunch (light) | 5–6 oz protein, 2 sides |
Protein Planning
The hardest and most expensive category to get wrong:
| Protein Type | Per-Person Cooked (dinner) | Buy Raw (accounting for loss) |
|---|---|---|
| Whole roasted chicken | 5–6 oz cooked | ½ bird |
| Beef (carved roast) | 5–6 oz cooked | 7–8 oz raw |
| Salmon fillets | 5–6 oz cooked | 6–7 oz raw |
| Pulled pork | 4–5 oz cooked | 7–8 oz raw |
| Pasta with meat sauce | 8–10 oz cooked | — |
| Vegetarian protein | 5–6 oz | varies |
Side Dishes and Starches
| Side Dish | Per-Person (as one of 2–3 sides) | Notes |
|---|---|---|
| Roasted vegetables | 3–4 oz | Shrinks significantly |
| Green salad (buffet) | 2–3 oz | Light; people don't take much |
| Rice or pasta | 3–4 oz cooked | Filling; less if other starches present |
| Potato salad | 4–5 oz | Popular; people take more |
| Bread rolls | 1.5–2 rolls | Always popular |
| Dessert | 4–6 oz (1 portion) | Plan 1.2× servings for popular items |
Full Event Example: 80-Person Wedding Reception
| Item | Per Person | Total |
|---|---|---|
| Beef tenderloin (raw) | 8 oz | 40 lbs |
| Roasted salmon | 6 oz | 30 lbs |
| Roasted vegetables | 4 oz | 20 lbs |
| Potatoes au gratin | 5 oz | 25 lbs |
| Dinner rolls | 2 rolls | 160 rolls |
| Wedding cake | 1 slice | 80 slices + 10 extra |
| Beverages (non-alcohol) | 3–4 drinks | 240–320 drinks |
| Wine (glasses) | 3–4 glasses | 240–320 glasses (~32–43 bottles) |
Buffet vs. Plated: The 20% Rule
For a buffet, add 20–25% to all protein quantities compared to plated service. For appetizer-heavy cocktail receptions, reduce main course quantities by 20–30% if substantial appetizers are served.
How much food do I need for children vs. adults?
Children under 12 typically eat 50–65% of an adult portion. The calculator has an age-breakdown field — enter your adult and child guest counts separately and it adjusts quantities automatically.
Should I plan for uninvited guests or seconds?
Build in a 10–15% buffer above your exact guest count for buffets. For plated events, exact headcount is sufficient, but have 5% extra for late arrivals or unexpected guests. For very popular items (brisket, chocolate desserts), add 20%.
How much alcohol should I plan for a 4-hour event?
The common formula: 1 drink per person per hour + 1 extra per person total for safety margin. For 100 guests over 4 hours: 100 × 4 + 100 = 500 drink servings. Mix of wine (25%), beer (40%), spirits (25%), and non-alcoholic (10%) for a typical crowd.
Related Calculators
- BBQ Planner Calculator — Casual cookout quantity planning
- Recipe Scaler Calculator — Scale your recipes to catering quantities
- Food Cost Calculator — Calculate total catering food cost and per-person pricing