The industry standard is 1.5 drinks per hour to calculate the average number of drinks you need.

If you have 100 guests for a 4 hour function, your formula will look like this:

100 x 4 x 1.5 = 600 drinks needed

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WINE
Serving Size: 5 ounces
750 ml = 5 servings
1.5 Liter = 10 servings

CHAMPAGNE
Service Size: 3 ounces
750 ml = 8 servings

SPIRITS
Service Size: 1 ounce
750 ml = 25 servings
Liter = 33 servings
1.75 Liter = 59 servings

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BEER
Service Size: 12 ounces*
750 ml = 5 servings
1/2 Barrel Keg = 120 servings
1/4 Barrel Keg = 60 servings*

BOTTLES – for upscale party; CANS – for picnics or pool and lake parties.