Every calculator on this site answers the same question: you know how many people are coming — what exactly do you buy? Each tool uses the standard quantity rules that caterers and event bartenders work from, shows its math, and rounds up to whole bottles, bags and boxes, because running out at 9pm is worse than having spares.
Drink calculators
Food & supplies calculators
Planning guides
- How much alcohol for a party? The formula caterers use
- Wedding drink quantities for 50, 100 and 150 guests
- How many bottles of prosecco do you need?
- How many spritzes in a bottle of Aperol?
- How much meat per person for a BBQ
- How many pizzas should I order?
- How much ice for a party?
- Coffee for a crowd: 20, 50 and 100 cups
- Batch cocktails: mix ahead vs. last minute
- Non-alcoholic party drink quantities
- Party drinks on a budget
- How many appetizers per person?
Why the math is the same everywhere
Nearly every quantity rule on this site descends from a handful of catering constants: guests drink about two drinks in the first hour and one per hour after; a 750 ml wine bottle pours five glasses; a spirits bottle pours about 17 shots; an adult eats three slices of a large pizza or about half a pound of cooked meat; a party consumes roughly one pound of ice per guest per hour in warm weather. The calculators combine those constants with your guest count and round everything up to what you can actually buy. Each tool page explains its own formula, so you can check the working — or argue with it.