If you're throwing a big party or a wedding, it can be tough to gauge how much booze to get. You can use this simple formula to help figure out your numbers, but if you're serving more than one type of drink, try these party planning booze calculators. For example, The Alcohol Calculator will tell you how many bottles of beer, wine and liquor to get, depending on how the size of your party. It will also give you a cost estimate. However, keep in mind that this calculator was designed for Americans, so it is in US dollars and the drinks are measured in ounces. Perfect Party Planning's Drink Calculator is a simpler option. You won't get a price estimate, but it also takes into consideration the length of your party.
If you're planning to get kegs for your party, try the keg calculator from Kegerators. It tells you how many cups and how much ice to get, too.
Of course, these all offer a general estimate. Your actual needs might vary depending on how much your partygoers drink and how long they plan to stay. Still, they're a good place to start for your boozy party.