Running out of drinks halfway through a party is every host's nightmare. Overbuying isn't great either, especially when you're left with a closet full of bottles nobody wanted. The good news is that a little math gets you remarkably close.
Start with the one-drink-per-hour rule
Assumption used here: about one drink per guest, per hour. A 50-person party that runs four hours needs about 200 drinks. Some guides add an extra drink per guest in the first hour, which puts the same party nearer 250 drinks — our alcohol calculator uses the same one-drink-per-hour starting point, so decide which assumption fits your crowd and label it rather than treating either as a universal target.
Then adjust for your crowd. A lively birthday or wedding reception tends to run higher, especially in the first hour. A daytime event, a work function or a lighter-drinking crowd will run lower.
Decide on your drink mix
A common balance for a mixed crowd is roughly 50% wine, 30% beer and 20% liquor. If your group loves cocktails, shift more toward spirits. If it's a casual backyard hang, beer might take the lead.
Convert drinks into bottles
Example: 100 guests, 5 hours
At one drink per guest per hour, that's 500 drinks. With a 50/30/20 split:
- Wine: 250 servings at a 5 oz pour. A 750 mL bottle gives about five 5 oz pours, so plan about 50 bottles
- Beer and seltzer: 150 servings. A 24-pack holds 24, so six packs give 144 and seven give 168 — round up to seven to reach 150
- Liquor: 100 cocktails. A 750 mL bottle holds about 16.9 theoretical 1.5 oz pours before waste: six bottles on theoretical yield, or seven at a conservative 16 servings per bottle. Plan seven
Work mixers out from your recipes instead of a flat rule: add up the tonic, soda, juice and syrups each drink calls for, then round up. Add citrus and garnishes to taste.
Don't forget the non-alcoholic side
These figures are alcoholic inventory for your drinking-adult count. Non-alcoholic demand is planned separately: water, sodas and a good mocktail or two keep every guest included, whether they're driving, sober or pacing themselves.
And then there's ice
Ice is the most commonly underestimated item at any party. Plan for about 1 to 2 pounds per guest, and more on a hot Chicago summer day or if you're chilling bottles in tubs.
Tips to avoid waste
Ask your store about its return policy before buying, since many shops take back unopened bottles. Stick to a focused menu rather than stocking every spirit, and consider one or two signature cocktails instead of a full bar.
Let us do the math for you
At Shake & Gather, we help every client build a shopping list that fits their guest count, crowd and budget. Contact us at info.shakeandgather@gmail.com or 217-374-9985 for a quote.
