Figuring out how much alcohol for 100 guests at a wedding is one of those problems that sounds simple until you're standing in a warehouse store staring at pallets of wine. Buy too little and the bar runs dry before the last dance. Buy too much and you've sunk hundreds of dollars into cases you can't return.

The good news: caterers and bar managers have been solving this exact math problem for decades, and the formula is more predictable than you'd think. This guide gives you the exact drink counts, a bottle-by-bottle shopping list, and the real 2026 costs — whether you're stocking the bar yourself or negotiating a venue package.

The Quick Answer: 350 Drinks for 100 Guests

For a standard 5-hour reception with 100 guests, assuming about 70% of them drink, plan for roughly 350 total drinks. Split the classic way — 40% beer, 40% wine, 20% cocktails — that breaks down to:

• 140 beers → about 6 cases of 24, or one half-barrel keg plus a case or two
• 140 glasses of wine → about 28 bottles (each 750ml bottle pours 5 glasses)
• 70 cocktails → 4–5 bottles of spirits (each 750ml bottle yields roughly 17 pours) plus mixers

Add 12–13 bottles of sparkling wine if you're doing a champagne toast, and you have the whole picture. The rest of this guide explains where those numbers come from and how to adjust them for your crowd.

The Formula Caterers Actually Use

Nearly every professional bar plan starts with the same rule of thumb:

One drink per drinking guest for the first hour, then one drink per hour after that.

For a 5-hour reception, that's about 5 drinks per drinking guest. Here's the math for 100 invitees:

• 100 guests × 70% who drink = 70 drinking guests
• 70 drinkers × 5 hours ≈ 350 total drinks

The 70% figure is the industry default for a mixed-age American wedding crowd. Nudge it up to 80–85% for a party-heavy crowd of mostly late-20s friends, or down to 50–60% if you have many older relatives, kids on the guest list, or a faith community that drinks lightly.

One important note: base this on your actual expected headcount, not your invite list. Typically only 75–85% of invited guests attend, so if you invited 120 people, you're realistically planning a bar for about 100. Our wedding guest list calculator helps you estimate your true attendance before you buy a single bottle.

Your Complete Shopping List for 100 Guests

Here's the full buying list for a 5-hour reception with a beer-wine-and-signature-cocktail bar — the setup most couples choose in 2026:

• Beer: 6 cases (144 cans/bottles) — mix a light lager, an IPA, and a seasonal option
• White wine: 16–17 bottles (Sauvignon Blanc, Pinot Grigio, or Chardonnay)
• Red wine: 11–12 bottles (Pinot Noir and Cabernet are the crowd-pleasers)
• Sparkling wine for the toast: 12–13 bottles (Prosecco or Cava keeps costs down)
• Vodka: 2 × 750ml bottles
• Whiskey or bourbon: 1 × 750ml bottle
• Tequila or gin: 1–2 × 750ml bottles (pick based on your signature drink)
• Mixers: 6–8 liters total — club soda, tonic, cranberry, citrus juices, plus fresh lemons and limes
• Ice: 1.5–2 lbs per guest — 150–200 lbs for the night (couples always underestimate this)
• Non-alcoholic: 2–3 gallons of a mocktail or lemonade, plus sodas and plenty of water

This list intentionally rounds up by about 10%. Leftover unopened cases are a minor annoyance; an empty bar at 9 p.m. is a wedding-day story nobody wants.

Wine: How Many Bottles & Which Split

Wine math is the easiest of the three: a 750ml bottle pours five 5-ounce glasses. So 140 glasses ÷ 5 = 28 bottles.

The white-to-red split depends on your season:

• Summer wedding: 60% white/rosé, 40% red — chilled wine disappears fast in warm weather
• Fall/winter wedding: 50/50, or even 45/55 leaning red

Buy by the case (12 bottles) — most wine shops and warehouse clubs give a 10–15% case discount, and many offer returns on unopened bottles. Ask before you buy; that return policy is your insurance against over-ordering.

Beer: Cases, Kegs, or Cans?

You need about 140 servings. Three ways to get there:

• Cases (6 × 24-packs): most flexible, easy returns, no equipment needed. Best for DIY bars.
• One half-barrel keg (≈165 twelve-ounce pours): often the cheapest per serving, but you'll need a kegerator or jockey box rental, and whatever you don't pour is wasted.
• Hybrid: a keg of the crowd-pleaser lager plus 2 cases of a craft option — the setup most bartenders recommend for 100 guests.

Stick to 2–3 beer choices maximum. Every additional variety makes your quantities harder to predict and increases leftovers.

Spirits & a Simple Signature Cocktail Plan

A full open bar with 10+ liquors is where budgets go to die. The smarter 2026 play: two signature cocktails plus beer and wine. You cover 70 expected cocktails with just 4–5 bottles of spirits:

• Each 750ml bottle yields about 17 cocktails at a 1.5-ounce pour
• 70 cocktails ÷ 17 ≈ 4.1 bottles — buy 5 for the buffer

Pick one vodka-based drink (broadest appeal) and one whiskey, tequila, or gin drink that fits your theme. Batch them in advance in dispensers and your bartender can serve twice as fast — which also means you may need one fewer bartender.

Champagne for the Toast

A toast pour is smaller than a regular glass: one 750ml bottle fills 8–10 flutes. For 100 guests, that's 12–13 bottles. Two ways to save here:

• Serve Prosecco or Cava ($10–$15/bottle) instead of true Champagne ($40+) — in a toast pour, almost nobody can tell
• Or skip the separate toast pour entirely and let guests raise whatever they're already drinking — planners report more than a third of poured toast champagne goes untouched

What a 100-Guest Wedding Bar Costs in 2026

With the average American wedding now running $34,200 (The Knot 2026 Real Weddings Study), the bar typically claims 8–12% of the total budget. For 100 guests, expect:

• DIY beer + wine + signature cocktails: $800–$1,500 in retail alcohol costs
• Add bartending service, ice, glassware, and mixers: $1,400–$2,400 all-in
• Venue open bar package: $25–$60 per person → $2,500–$6,000 for the same 100 guests
• Consumption bar at the venue: usually lands between the two, at $2,000–$3,500 for moderate drinkers

Don't forget the line items that surprise couples on the final invoice: sales tax, an 18–22% service charge, and bartender gratuity. Our tax and tip calculator stacks all three on top of your bar quote so you see the true total before signing.

Buying Your Own vs. the Venue Package

Supplying your own alcohol can save 30–50% versus a venue bar package — but only if the conditions line up:

• Your venue must allow outside alcohol. Many don't, and some that do charge corkage fees of $10–$25 per bottle that erase the savings.
• You'll need a licensed, insured bartender. Plan on $40–$75 per hour, per bartender — and for 100 guests, you want two so the line never backs up.
• Returns are your safety net. Buy from retailers that accept unopened returns, keep receipts, and don't chill more than you expect to pour each hour.

A middle path worth asking about: some venues let you supply wine and beer while they run the spirits bar. You save on the highest-volume items and skip the liability questions on liquor.

5 Mistakes That Leave Bars Dry (or Wallets Empty)

1. Planning off the invite list, not the RSVP count. You'll overbuy by 15–25%. Wait for RSVPs, or estimate attendance first.
2. Forgetting cocktail hour is the thirstiest hour. Guests average two drinks in hour one. Front-load your chilled inventory.
3. Underbuying ice. 100-guest weddings need 150–200 lbs. It's the cheapest item on the list and the most common emergency store run.
4. Offering too many choices. Every extra beer style, wine varietal, or liquor bottle makes quantities less predictable. Curate hard.
5. Ignoring the non-drinkers. Thirty of your 100 guests won't touch alcohol. A good mocktail station costs under $100 and they will remember it.

Run Your Own Numbers

Every crowd is different — a Sunday brunch reception and a Saturday night dance party can differ by 150 drinks with the same guest count. Adjust the drinker percentage, reception hours, and drink split to your actual crowd, and let the calculator do the bottle math.

Related Guides & Tools

• Wedding Alcohol Calculator — exact bottle counts for any guest count
• Wedding Guest List Calculator — estimate your real attendance before you buy
• Wedding Catering Calculator — food costs per person by menu style
• Wedding Savings Calculator — plan how to fund the bar and everything else
• Wedding Vendor Tipping Guide — what to tip your bartenders and servers