Party Planner How much alcohol do I need for a party?Not sure how much to buy? Use our simple calculator below to figure out the optimal amount needed for your drink calculator. Party Duration hours Guest Count Select “Average” if you don’t know Light Drinkers Average Drinkers Heavy Drinkers What Will Be Served Beer Wine Liquor Calculate Drinks Drinks Needed Bottle(s)/Can(s) of Beer (12 oz) Bottle(s) of Wine (750 ML) Bottle(s) of Liquor (750M)