How Much Alcohol Do I Need for a Wedding of 100 Guests?

If your venue lets you bring your own alcohol, you get to control the budget and choose exactly what your guests drink. The trade-off is that you also have to decide how much to buy. Buy too little and the bar closes early. Buy too much and you're storing cases of wine in the garage for a year. This guide walks through the same math our bartenders use, then applies it to a 100-guest wedding with five hours of bar service.

One note before we start: Well Served provides bartending labor only. You purchase and supply all alcohol, mixers, and ice; we handle the bar. That's exactly why getting these numbers right matters.

The Four Numbers You Need

Almost every bar plan comes down to four rules of thumb. They're starting points, not laws, and we'll talk about adjusting them later.

• Drinks: plan on 1 drink per guest per hour of bar service.
• Mix: for a balanced bar, 50% of drinks are wine, 30% are beer, and 20% are liquor.
• Bottles: a 750 ml bottle of wine pours about 5 glasses; a 750 ml bottle of liquor makes about 16 drinks at a standard 1.5 oz pour. Beer is counted by the can or bottle and bought in 12-packs.
• Ice: 1.5 pounds per guest, or 2 pounds per guest for outdoor events in summer.

The one-drink-per-hour rule averages out a crowd. Some guests will have two drinks in the first hour and then switch to water; others won't drink at all. Across 100 people, it balances out to roughly one per person per hour. It's also why the length of bar service matters as much as the guest count.

Worked Example: 100 Guests, 5 Hours

Let's say your cocktail hour starts at 5:00 PM and the bar closes at 10:00 PM. That's five hours of service for 100 guests, with a balanced full bar.

Step 1: Total drinks

100 guests × 5 hours × 1 drink = 500 drinks.

Step 2: Split by type

Wine is 50% of 500, or 250 drinks. Beer is 30%, or 150 drinks. Liquor is 20%, or 100 drinks.

Step 3: Convert to bottles and packs

Wine: 250 glasses ÷ 5 glasses per bottle = 50 bottles, a little over four cases. Beer: 150 drinks ÷ 12 = 12.5, which rounds up to 13 twelve-packs (156 cans or bottles). Liquor: 100 drinks ÷ 16 drinks per bottle = 6.25, which rounds up to 7 bottles.

Step 4: Ice

Indoors, 100 guests × 1.5 pounds = 150 pounds of ice. For an outdoor summer wedding, use 2 pounds per guest, or 200 pounds. Ice covers chilling bottles, filling glasses, and the melt you'll lose over five hours in Florida heat, so don't skimp.

Splitting Wine, Beer, and Liquor Further

Fifty bottles of wine doesn't tell you what color. A common split is about 60% white or rosé and 40% red, leaning even further toward white for warm-weather or outdoor receptions. That would be 30 bottles of white or rosé and 20 of red. If your crowd loves red, flip it.

For beer, two or three styles is plenty: a light lager most people will drink, plus one or two crafts. For liquor, seven bottles might look like two vodka, two whiskey or bourbon, one gin, one rum, and one tequila. If you're serving a signature cocktail, shift bottles toward its base spirit and buy its mixers in proportion.

Don't Forget the Non-Alcoholic Side

Mixers run out faster than people expect. Plan sodas, tonic, soda water, and juice to match your liquor: roughly one 2-liter of mixer for every bottle of liquor, plus extra soda and sparkling water for guests who aren't drinking. Bottled or dispensed water should be available the whole night. Garnishes such as limes, lemons, and oranges are usually a few dozen pieces for a crowd this size.

When to Adjust the Numbers

The formulas assume an average crowd. You know your guests better than any formula does, so adjust in these situations:

• Beer and wine only: drop the liquor and shift its share to wine and beer. A 60% wine, 40% beer split is common.
• A heavy-cocktail crowd: move toward 35% wine, 25% beer, and 40% liquor.
• Lots of non-drinkers or a daytime event: you can reduce the total by 15 to 25%.
• A champagne toast: add one bottle of sparkling wine for every six to eight guests, on top of the bar total. For 100 guests, that's 13 to 17 bottles.
• A long cocktail hour before dinner: guests drink more in the first hour, so make sure the first-hour stock is chilled and ready.

Buying Smart

Ask your store whether it accepts returns of unopened bottles; some do, which lets you buy a little extra without the risk. Buy wine by the case when you can, since many stores discount full cases. Buy ice the day of the event or arrange delivery, and confirm with your venue where it can be stored.

Plan your drop-off too. Many venues want alcohol delivered at a specific time and stored in a specific room. Make sure someone on your side, often your planner or a family member, is responsible for getting it there and taking leftovers home at the end of the night.

How Many Bartenders for 100 Guests?

For a full bar, plan on one bartender per 50 to 75 guests, so two bartenders for 100 guests. For beer and wine only, one bartender can often handle 75 to 100 guests, though two keeps lines short during cocktail hour. Once you pass 125 guests, add a barback to restock ice and clear glasses.

Get Your Exact Numbers

If your wedding isn't exactly 100 guests over five hours, our Free Bar Planning Tool runs these same formulas for your guest count, hours, venue type, and drink style, and gives you a shopping list and prep timeline in seconds. When you're ready, request a quote and we'll confirm staffing and send you a written plan.

Quantities are estimates; adjust for your crowd. Well Served BYOB Bartending LLC provides bartending labor only. Clients purchase and supply all alcoholic beverages.