Catering Quantity Calculator
Planning the right food quantities for a catered event prevents the two cardinal sins of catering: running out of food, which embarrasses the host, and preparing so much food that cost overruns kill profitability. This calculator takes the guest count, meal type (cocktail, buffet, or plated), and a 10-15% overage buffer, and returns the total food quantities needed per category. Quantities are based on widely-used catering industry guidelines for adult portions at each meal type. For events with children, apply a 50% portion reduction for guests under 10 years old (enter the adult-equivalent count instead of total head count).
Catering quantity formula
Adjusted guests = guests * (1 + overage / 100)
Protein (lbs) = adjusted_guests * protein_oz_per_person / 16
Starch (lbs) = adjusted_guests * starch_oz_per_person / 16
Buffet dinner portions: protein 5 oz, starch 4 oz, salad 4 oz, dessert 1
Plated dinner portions: protein 7 oz, starch 4 oz, salad 3 oz, dessert 1
Catering planning tips
- Order 10-15% more than calculated quantities to account for unexpected guests and variance in appetite.
- For cocktail events, increase appetizer quantities by 50% for the first hour of a 2+ hour event.
- For buffets with 5 or more dishes, reduce each dish quantity by 15-20% (variety reduces per-item consumption).
- Always have a backup protein dish available at a buffet in case the main runs low.
- Account for cooking yield: 1 lb raw beef yields approximately 0.75 lb cooked. Order raw weight accordingly.
Catering quantities: frequently asked questions
How much food do I need per person for a catered event?
General guidelines: meat or main protein 4-6 oz per person, starch/sides 3-4 oz per person, salad 3-4 oz per person, appetizers 4-6 pieces per person per hour of cocktail hour, and dessert 1 portion per person. These are guidelines; actual consumption varies by time of day, demographics, and number of food choices available.
How does the number of dishes affect portion sizes?
When more choices are offered (buffet vs plated), portion sizes per item decrease because guests divide their appetite across more dishes. For a 3-course plated dinner, plan full portions per course. For a 10-item buffet, each item may be consumed at 50-60% of the normal portion because variety reduces individual item consumption.
Should I plan for leftovers when catering?
Yes, a 10-15% overage buffer is standard practice in catering to account for variance in guest attendance, appetite differences, and the social stigma of running out of food. Running short of food at an event is far more damaging to a caterer's reputation than having some leftover food.
How much protein do I need for a buffet vs a plated dinner?
For a plated main course, plan 6-8 oz of cooked protein per person. For a buffet with one protein, plan 5-6 oz. For a buffet with two protein options, plan 3-4 oz of each. Always account for cooking yield: a 1 lb raw chicken breast yields about 12 oz cooked (75% yield).
How do I calculate food quantity for a children's party?
Children typically eat 50-60% of adult portions up to age 10. For mixed age groups, estimate the number of adult-equivalent guests: for each child under 10, count 0.5 adult portions; for teens, count 0.75. Add the adult equivalent count to the adult guest count, then apply standard adult per-person quantities.
Official sources
- USDA FSIS: Safe Food Handling for Catering.
- FDA: Food Safety for Catering Operations.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.