Plan the party by the numbers.

What PartyQuik does

Every party has a moment, usually the night before, where someone stands in a store aisle doing arithmetic they don't trust: how much is enough for forty people? Too little and you're the host who ran out of ice at nine o'clock; too much and you're eating potato salad for a week. The rules of thumb exist — caterers and bartenders use them every day — but they're scattered across a hundred blog posts, most of them contradicting each other and none of them doing the multiplication for you.

These calculators are those rules, applied. Give them a guest count and a few details — how long, what kind of crowd, plated or buffet — and they return a shopping list in the units you actually buy: bottles, trays, pounds, bags, cases. Kids are counted differently from adults, a four-hour reception is counted differently from a two-hour lunch, and everything rounds up, because a store won't sell you two-thirds of a case.

Who it's for

Anyone hosting something bigger than a dinner for six: backyard birthdays, graduation parties, a wedding you're doing yourself, Thanksgiving for the whole extended family, a church potluck, an office party you got volunteered for. Event rental companies, venues, and caterers use the calculators to help customers arrive with a realistic number, and some put them straight on their own websites — which is free.

How the numbers are checked

Every calculator lists its sources at the bottom of the page: standard catering serving rates, beverage-industry pour sizes, USDA and FDA food-safety guidance, and published serving charts for things like cake tiers and turkey yields. Where the trade genuinely disagrees with itself — buffet portions are the classic case — the calculator says which convention it uses and why. When a source changes, the calculator changes and the review date on the page moves. If a number looks wrong to you, tell us; verified corrections ship within days.

What we don't do: we don't sell anything, recommend brands, or take a cut of what you buy. Alcohol calculators assume adults of legal drinking age and say so; food calculators follow the USDA two-hour rule and say that too. A calculator will tell you how much to buy for the crowd you describe. It can't tell you who's coming — that part is still on you.