Having 100 guests? Then you’ll need 12 bottles of red and 12 bottles of white. Hosting 150? Up the vino to 18 bottles of each. Whether you’re serving champagne only or having a full-blown bar, your goal is to have enough liquor on hand to last as long as your party does (figure about four hours.)

Click on the icon above to download this handy chart. The checklist tells you how much booze you’ll need based on your guest list — use it and you won’t end up running dry (or having enough extra vodka to last a lifetime!) Oh, and don’t forget the ice!