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Party Drink Calculator
How many beers, bottles of wine, and bottles of liquor you need for any size party — plus ice, cups, and water.
Enter your guest count, how long the party lasts, and roughly what percent of guests drink alcohol. The calculator uses the standard catering rule (about 1 drink per drinker per hour, plus an extra drink for the first hour) and your beer/wine/cocktail split to estimate exact quantities to buy.
How the math works
Drinkers = guests × (share who drink ÷ 100). The base rate is 1 drink per drinker per hour, scaled by event style: 1.0× casual, 1.25× celebration, 1.5× wedding. We add 1 extra drink per drinker to cover the first-hour rush.
Total drinks = drinkers × (rate × hours + 1). That total is split by your beer / wine / cocktail percentages. Beer is counted in 12-oz cans (24 per case). Wine is 5 oz per glass — five glasses per 750 mL bottle. Cocktails use 1.5 oz of spirit each, so a 750 mL bottle yields about 17 cocktails.
Ice = guests × (hours + 1) pounds. Cups = guests × hours × 2. Water = guests × (hours ÷ 2 + 1) bottles. Every output is rounded up so you never under-buy.
Drink mix templates that work
Casual backyard BBQ: 60% beer, 30% wine, 10% cocktails. Lots of cans on ice, a few crowd-friendly reds and whites, and one batched cocktail (margaritas, palomas).
Cocktail party / housewarming: 20% beer, 30% wine, 50% cocktails. Stock a flexible spirit (vodka, gin, bourbon) plus tonic, soda, citrus, and bitters.
Wedding / formal celebration: 30% beer, 50% wine, 20% cocktails. Wine carries the dinner; a signature cocktail covers the rest. Bump 'event style' to wedding for the +1.5/hr rate.
Holiday dinner party: 10% beer, 70% wine, 20% cocktails. Lean on wine pairing with the meal; keep a few beers for variety.
Don't forget the non-alcohol essentials
Mixers: 1 L tonic + 1 L club soda + 1 L cola per 10 cocktail drinkers. Add 2 lemons and 2 limes for every 20 guests.
Cups: 16-oz clear plastic for everything except wine; have stemless wine glasses or plastic stems if it's wine-heavy. Recycle as you go.
Ice: half for drinks (in the cooler), half for chilling unopened bottles. Buy bags from two stores so you don't get half a bag of melted slush.
Garbage: one extra trash bag per 10 guests, plus a dedicated recycling bin for cans and bottles — it makes cleanup half as long.
Frequently asked questions
How many drinks per person at a party?
The catering standard is one drink per drinker per hour, plus one extra drink during the first hour to cover the welcome rush. So at a 4-hour party, plan on about 5 drinks per drinker. Celebrations and weddings trend higher (1.25–1.5 per hour).
How many beers do I need for 50 people?
For a typical 4-hour party where about 80% of guests drink and beer is roughly 40% of the mix, you'd want about 80 12-oz cans of beer (a little over 3 cases). Enter your exact numbers above for the precise count.
How many bottles of wine for 100 guests?
A standard 750 mL bottle pours five 5-oz glasses. If wine is 40% of the drink mix at a 4-hour event with 100 guests, plan on around 32 bottles. Always round up — leftover wine keeps.
How much liquor for a party?
A 750 mL bottle of spirits yields about 17 cocktails (1.5 oz pour). For a 100-guest, 4-hour party with 20% cocktails, that's about 6–7 bottles of liquor — choose a flexible spirit like vodka, gin, or bourbon.
How much ice for a party?
Plan on about one pound of ice per guest per hour, plus one pound per guest for chilling drinks at the start. A 50-guest, 4-hour party needs roughly 250 lbs (25 ten-pound bags) — much more than people expect.
How many cups do I need?
Estimate two cups per guest per hour. Guests set cups down and lose track, switch from beer to wine, etc. For a 50-person, 4-hour party that's 400 cups.
Should I serve water too?
Yes — one 16.9-oz bottle of water per guest for every two hours, minimum. Hydration prevents over-service and keeps the party going longer.
What if some guests don't drink alcohol?
Use the 'share who drink' slider. A realistic mix is 70–85% drinkers depending on the crowd. For everyone else, add sparkling water, soda, and at least one fun non-alcoholic option (mocktail, fruity punch).
How do I avoid buying way too much?
Buy from a store with a return policy on unopened bottles, especially for wine and spirits. Beer and ice are harder to return — round those a little tighter. And always grab one extra of the most-popular item.
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