Full bar – Beer, wine and liquor: 100 (guests) x 5 (hours) = 500 drinks. 500 x 0.33 = 170 beers or 7 cases of beer or one ½ barrel sized keg. 500 x 0.33 = 150 glasses of wine, /5 glasses per bottle= 37 bottles of wine. 500 x 0.33 = 150 mixed drinks, /39 servings per 1.75 bottle = four 1.75ml bottles liquor.
So as guide, if you have 100 guests, you will need around 50 bottles of wine (mix of red and white.) Plus around 300 pints/bottles of lager, beer and cider.
Total for 100 Guests: 70 bottles of wine. 175 bottles of beer. 15 bottles of spirits.
For alcohol, standard calculation is: 2 drinks per hour for the first hour; then 1 per hour after. You use the whole guest count for this, and that way the babies and non drinkers compensate for your folks who can drink more heavily or waste.
Plan on one drink per guest for each hour of your function. Let's assume you are throwing a 4 hour evening party for 100 guests. In other words, 100 guests x 4 hours = 400 drinks.
Full bar – Beer, wine and liquor: 100 (guests) x 5 (hours) = 500 drinks. 500 x 0.33 = 170 beers or 7 cases of beer or one ½ barrel sized keg. 500 x 0.33 = 150 glasses of wine, /5 glasses per bottle= 37 bottles of wine. 500 x 0.33 = 150 mixed drinks, /39 servings per 1.75 bottle = four 1.75ml bottles liquor.
Full bar – Beer, wine and liquor: 100 (guests) x 5 (hours) = 500 drinks. 500 x 0.33 = 170 beers or 7 cases of beer or one ½ barrel sized keg. 500 x 0.33 = 150 glasses of wine, /5 glasses per bottle= 37 bottles of wine. 500 x 0.33 = 150 mixed drinks, /39 servings per 1.75 bottle = four 1.75ml bottles liquor.
General Rule of Thumb A common recommendation is one bartender for every 50-75 guests. For a 100 person business party, this translates to about 2 to 2 bartenders. However, this can vary based on the factors mentioned above.
For a 4 hour party with 100 guests, you will need approximately 400 drinks: 160 beers, 144 glasses of wine (29 bottles) and enough liqueur for 96 individual cocktails (amounts will depend upon what type of cocktail you serve). If you aren't serving wine, plan on 240 cocktails.
A good rule of thumb is to buy 10 bottles of vodka, 6 bottles of whiskey, 6 bottles of gin, 4 bottles of scotch, 2 bottles tequila, 2 bottles of triple sec, 2 bottles of vermouth, 4 cases of beer, and 2 cases of wine for every 100 guests.