It turns out, there is a magic formula when it comes to calculating the amount of drinks you'll need for your wedding, sort of: Plan for at least one drink per person per hour. (So for a six-hour wedding with 100 guests, you'll need roughly 600 drinks.)
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.
After you know how many guests you are expecting, simply calculate two drinks for each guest in the first hour and then one drink for each guest for each successive hour after that.
Formula for Standard Drinks A government standard formula is used to determine how many standard drinks are in alcoholic beverages. The formula is outlined below: Volume of beverage in Litres, multiplied by the percentage of alcohol volume, multiplied by 0.789, equals the number of standard drinks.
(So for a six-hour wedding with 100 guests, you'll need roughly 600 drinks.) Alex Tornai, party planner for Binny's Beverage Depot, errs on the side of more drinks per person (and we're here for it): “Two drinks in the first hour and one drink per hour for the duration of the evening,” he says.
The typical school of thought is to plan one drink per hour per guest. Say you want to calculate how much alcohol for a wedding of 150 for a two-hour reception. That would equal 300 drinks throughout your event. Of course, this number is just an average.
Served in a glass with ice, one can will make three drinks. For a wedding of 100 guests, two cases of soda should be plenty, she says.
A 2-liter bottle of soda will give 10 8-ounce servings, while beverages that come in gallon containers will yield 16 8-ounce servings. That comes out to four drinks per person during our three-hour party, which means we'll need five bottles of soda or three gallons of juice or a mix of both to total 48 servings.
Non-alcoholic drinks will average out to around 2 gallons per 1 guest at your reception. In general, you should plan for 1-2 cups of water per guest and 3-4 non-water drinks (tea, lemonade, soda), estimating to be about 5 drinks per person, or 1 drink per hour.