Exactly How Much Alcohol to Buy for a 100 Person Wedding

Planning your wedding bar can feel overwhelming. One of the most common questions couples ask is:

“How much alcohol do we actually need for 100 guests?”

Buy too little and the bar runs dry. Your guests become annoyed. Buy too much and you’ve wasted hundreds of dollars.

After years of bartending weddings and events, I can tell you that the right amount depends on a few key factors — but there is a reliable formula you can follow.

This guide breaks down how much beer, wine, and liquor you’ll need for a typical 100-guest wedding, plus an easy calculator method you can use for any guest count.

The Basic Wedding Alcohol Formula

A standard rule used by bartenders and event planners is:

1 drink per guest per hour

Most weddings with an open bar last about 4–5 hours.

So for a 100-guest wedding:

• 100 guests

• × 4–5 drinks per person

• = 400–500 total drinks

Not every guest will drink that much, but others will drink more. The formula balances out pretty accurately across large groups.

Alcohol Breakdown for 100 Guests

Most weddings serve a mix of beer, wine, and liquor.

A common ratio is:

• 25% wine

• 25% beer

• 50% liquor

Using a 400-drink estimate:

Wine

100 servings

Since one wine bottle provides about 4 glasses:

You need about 25 bottles of wine

Split example:

• 13 bottles white

• 13 bottles red

(Always caution on the side more)

Also, take into account the time of year it is, what the temperature will be like and what is being served for dinner. Warmer weather months should include more white wines while cooler months, more red. If the majority of dinner is chicken or fish, white wine will be more popularly paired as opposed to red wine with steak, for example.

Beer

100 servings

Most beer drinkers have 1–2 beers.

You’ll need about 100–120 bottles or cans

Offering 2 types (lager + IPA) usually works well.

I always tell me clients "you know your guests best". If the majority of the groom's side drink light domestic beer, take that into account and have that on hand. You want your guests to feel like their needs are met and available.

Liquor

200 servings

If you’re serving signature cocktails, this will be used quickly.

Typical liquor estimate:

• 11-12 standard liter bottles

Example bar lineup:

• Vodka

• Tequila

• Whiskey

• Gin

• Rum

Again, take your guests and time of year into account. Vodka and tequila are typically the most popular spirits at weddings because they can easily be mixed with neutral mixers. Summertime can bring out more gin and rum drinkers and winter more whiskey/bourbon enthusiasts.

Signature Cocktail Weddings (Popular Option)

Many couples choose 2 signature drinks instead of a full cocktail menu.

This keeps the bar moving faster and simplifies alcohol purchasing. Mixed drinks can also be concocted with liquor used in the mixed drinks as well. For example, if your signature drink is a Margartia, your guests can also use the tequila for a tequila and seltzer.

Example estimate for 100 guests:

• 40% choose signature drink #1 (one will most always be more popular than the other)

• 30% choose signature drink #2

• 30% beer/wine

If batching cocktails, plan for about:

70–80 servings per signature drink

Your bartender can pre-batch these to speed up service. This is highly recommended at cocktail hour so guests don't have to wait long in the initial post-ceremony line.

Champagne Toast Calculation

If you’re doing a toast, you’ll need:

1 glass per guest

One champagne bottle = 6 "toast" pours

(A toast pour is 3oz vs a full glass pour of 5oz)

For 100 guests:

You need about 17 bottles of champagne

Many couples buy 17–20 bottles to be safe.

Mixer and Garnish Guide

If serving liquor, don’t forget mixers.

Typical quantities for 100 guests:

• 6–8 liters soda water

• 6 liters tonic

• 4 liters cola

• 3–4 liters juice (cranberry, pineapple, lime)

• 1.5-2lbs of ice/person- 150-200lbs of ice

• garnishes (lemons, limes, oranges)

Ice is often underestimated — always buy extra.

Wedding Alcohol Calculator (Quick Method)

You can estimate alcohol for any guest count using this formula:

Guests × Hours = Total Drinks Needed

Then divide by drink type percentages.

Example:

100 guests × 4 hours = 400 drinks

Split:

• 100 wine

• 100 beer

• 200 cocktails

This simple formula works surprisingly well for most weddings.

Common Wedding Bar Mistakes

After bartending hundreds of events, these are the mistakes couples make most often:

1. Buying too many liquor types-A smaller, curated menu keeps service fast.

2. Forgetting about ice- Ice disappears quickly during busy service. Warm weather should also be taken into account when purchasing ice. Remember that ice is used for chilling AND serving.

3. Overcomplicating signature cocktails-Simple drinks work best for large crowds. Your bartenders will speed through more simple cocktails and lines will be shorter.

4. Overestimating wine drinkers-Liquor is almost always the top seller at weddings.

If you want a smooth bar experience, stick to:

• Beer

• Wine

• 2 signature cocktails

Guests get variety without slowing down service.

Your bartenders (and your guests waiting in line) will thank you.

Need Help Planning Your Wedding Bar?

If you’re planning a wedding and don’t want to guess on quantities, a professional bar service can help you calculate everything correctly — from alcohol amounts to bar setup and signature cocktail design.

A well-planned bar keeps guests happy and your celebration flowing smoothly. If you are getting married in New Hampshire or Southern Maine, Bar Hopper is your go to mobile bar service!