The rules of thumb behind every calculator
Every number on this site comes from the portion standards professional caterers use, cross-checked against university extension guides and USDA food-safety guidance. The core rules are simple: about 6 ounces of cooked protein per adult at a buffet, 3 slices of pizza per adult, 10 wings if they're the meal, 2 drinks in the first hour then 1 per hour, 1 pound of turkey per person (1.5 with leftovers), and kids count as about half. The calculators handle the multiplying, the raw-to-cooked conversion, the buffet bump, and the rounding up to cases, dozens and 10-pound bags.
Planning for a crowd, step by step
- Nail the headcount. For RSVP events, add 10%. For open-house style parties, extension services suggest planning for about 60% of the people invited.
- Pick the format. Buffet, plated, cookout or appetizers-only changes the quantities more than anything else.
- Run the food and drink calculators and take the lists to the store. Buy meat by raw weight — it loses about a quarter of its weight in cooking.
- Buy 10% more drinks and ice than you think. Unopened bottles can usually be returned; running out cannot be fixed.
- Keep it safe. Perishable food shouldn't sit out longer than two hours (one hour above 90°F). Set out half, refill from the fridge.
Seasonal favorites
Super Bowl: 5–6 wings per person alongside pizza and dips, 1–2 slices of pizza each, and 2 drinks in the first hour. Graduation open house: plan for 60% of invitees, sliders at 1.5–2 oz of meat each, and 2 drinks per person per hour. Fourth of July cookout: 1.5 burgers and half a hot dog per adult. Thanksgiving: 1.5 lb of turkey per person and one pie per six guests. Every one of these is baked into the calculators above.