How many drinks per person
Bartenders and caterers plan with one formula: two drinks per guest in the first hour, then one drink per hour after that. People arrive thirsty and settle in. A three-hour party is four drinks per drinking guest; a four-hour wedding reception is five. That's an average — some guests have one, some have seven — but across a crowd it holds up remarkably well. The calculator lets you nudge it for a heavier or lighter crowd.
Only count guests who'll actually drink. At most parties that's 70–90% of adults; at a family or work event it can be half. Non-drinkers still need something in hand, so soft drinks and water are calculated separately.
Bottle math
- Wine: a 750 ml bottle pours five 5-oz glasses. A case is 12 bottles, 60 glasses.
- Liquor: a 750 ml bottle makes about 16 drinks at 1.5 oz. A 1.75 L "handle" makes about 39. Each cocktail needs 4–6 oz of mixer.
- Beer: one drink is one 12-oz can or bottle. A case is 24. A full keg (15.5 gallons) is about 165 servings; a pony keg about 82.
- Champagne toast: one bottle per eight guests for a single pour.
- Ice: 1–2 pounds per guest for chilling and cocktails; more in summer or if you're icing down cans. It's the item hosts most often run out of.
What people actually choose
When beer, wine and liquor are all offered, a typical crowd splits roughly 40% beer, 35% wine, 25% cocktails. Wedding crowds skew toward wine and cocktails; backyard and game-day crowds skew toward beer. If you only offer two of the three, the calculator redistributes. For wine, split 60/40 white to red in warm weather and 50/50 in cold. For a two-cocktail bar, one vodka-based and one whiskey-based drink cover most preferences, and it lets you buy just two spirits.
How much alcohol for 50 guests
For a four-hour party where 40 of the 50 drink: about 200 drinks. With a full bar that's roughly 80 beers (3½ cases), 72 glasses of wine (15 bottles, or 1¼ cases), 48 cocktails (3 bottles of liquor, 8 quarts of mixers), plus 75 lb of ice, soft drinks for the non-drinkers, and water for everyone. Run your own numbers above for a different split.
Buying and serving tips
- Most liquor stores let you return unopened bottles and cases. Ask before you buy, then buy 10–15% extra without guilt.
- Chill beer and white wine for at least 4 hours in a fridge, or 30–45 minutes in an ice-and-water bath (much faster than ice alone).
- Set up a self-serve station away from the food table to break up the crowd.
- Put water out prominently. Guests who can find water drink less alcohol and go home in better shape.
- For events with driving guests, plan to stop pouring an hour before the end.
Frequently asked questions
How many drinks per person for a party?
Two in the first hour, one per hour after. Four hours ≈ five drinks per drinking guest.
How much alcohol for 50 guests?
About 200 drinks for a four-hour party where 80% drink: ~80 beers, 15 bottles of wine, 3 bottles of liquor and 8 quarts of mixers, plus 75 lb of ice.
How many bottles of wine for 20 people?
If everyone drinks wine for four hours, 100 glasses = 20 bottles. If wine is one of three options, about 7 bottles.
How much ice for a party?
1–2 lb per guest. 50 guests: 75–100 lb, more in summer.
How much beer for 100 people?
Beer-only, four hours, 80% drinking: about 400 beers — 17 cases, or 2½ full kegs.
How many non-alcoholic drinks?
Plan one soft drink per non-drinker per hour plus one, and about one bottle of water per guest per 1–1.5 hours.