Most wedding bar advice stops at "1 drink per guest per hour". That's a fine start. It just doesn't tell you how many bags of ice to buy, how many glasses the bar goes through, or why the line is 12 deep at 8:15.
These are the numbers I plan with when I'm setting up a real wedding bar. They are the same ratios our free wedding alcohol calculator, ice calculator, and bartender calculator use, so the math here matches the tools.
The quick answer
| What you need | Planning number |
|---|---|
| Drinks | About 1 drink per drinking guest per hour |
| Full bar split | 40% beer, 30% wine, 30% liquor |
| Beer | 1 case (24) per 24 beer drinks |
| Wine | 1 bottle (750ml) per 5 glasses |
| Liquor | 1 bottle (750ml) per 16 drinks |
| Mixers | 1 liter per 8 liquor drinks |
| Ice | About 2.1 lb per guest for a 5 hour indoor full bar; up to 3.3 lb outdoors in heat |
| Glassware | 1.5 glasses per guest per drink type they're drinking |
| Bartenders | 1 per 60 guests for a full bar, 1 per 85 for beer and wine, 1 per 40 for a cocktail bar |
| Barbacks | 1 once you pass 75 guests; more at 3 or more bartenders |
Add about 15% to ice, mixers, and glasses so nothing runs out in the last hour. That's the margin I build into real event orders.
How much alcohol for a wedding
Step 1: count drinking guests. Not everyone drinks. Take your guest count and multiply it by the share you expect to drink. For most weddings I plan around 80% to 90%. A family-heavy daytime wedding runs lower; a Saturday night with the college friends runs higher.
Step 2: multiply by hours. Drinking guests times bar hours gives you total drinks at the 1 drink per hour baseline.
Step 3: split by bar style.
| Bar style | Beer | Wine | Liquor |
|---|---|---|---|
| Full open bar | 40% | 30% | 30% |
| Beer and wine only | 55% | 45% | 0% |
| Craft cocktail bar | 20% | 20% | 60% |
Step 4: turn drinks into bottles. A case of beer is 24 drinks. A 750ml bottle of wine pours 5 glasses at a 5oz pour. A 750ml bottle of liquor makes about 16 drinks at a 1.5oz pour. Those pours line up with the US standard drink sizes: 12oz of regular beer, 5oz of wine, and 1.5oz of 80 proof spirits (NIAAA, "What is a standard drink?"). Spread the liquor across what your crowd drinks, usually vodka, whiskey, gin, and tequila, rather than buying one big count of a single bottle.
Step 5: mixers. Plan 1 liter of mixer for every 8 liquor drinks, then add the 15% buffer.
If you'd rather not run it by hand, the event alcohol and glassware calculator does all 5 steps in about a minute. For the longer version of this formula, with a 50 guest party example, see how much alcohol you actually need for a party.
How much ice for a wedding
Ice does 2 jobs: it goes in the drinks, and it keeps the beer, wine, and mixers cold. Most people only plan for the first. Here's how our ice calculator builds the number:
- Drink ice: 0.3 lb per guest per hour for a full bar. That's 0.2 for beer and wine only and 0.4 for a cocktail bar, where every shaken drink burns ice in the tin.
- Cooling ice: 0.4 lb per guest for tubs and coolers.
- Weather: multiply both by 1.25 for an outdoor reception in mild weather and 1.6 for an outdoor reception in heat.
- Melt buffer: add 10%.
For a 5 hour full bar, the drink ice alone works out to 1.5 lb per guest, which is the same number our event calculator uses for drinks. Cooling ice and the buffer bring the indoor total to about 2.1 lb per guest. Our event calculator counts drink ice only, so it shows 173 lb for this wedding. The ice calculator adds the cooling ice. Outdoors in July it's closer to 3.3 lb.
Keep cooling ice and drink ice in separate containers. The ice around the bottles has had hands in it all night and never goes into a glass. If your reception is outside, our post on keeping ice from melting at an outdoor party covers storage.
How many glasses for a wedding
Plan glassware for guests, not for drinks. A 100 guest wedding might pour 400 drinks, but you don't need 400 glasses. You need enough clean ones in rotation at once.
The number I use is 1.5 glasses per guest per drink type they're drinking. People set a glass down for the first dance and grab a fresh one, and nobody is washing glasses mid-reception. Then add 15%.
How that shakes out by drink type:
- Wine: 1.5 glasses for every wine drinker.
- Beer: plan glasses for about 40% of beer drinkers. The rest drink from the can or bottle.
- Liquor: split between tall and short glasses. If most of your liquor goes into mixed drinks, plan about 80% highballs and 20% glasses for drinks served up. If your crowd drinks bourbon neat or on the rocks (this is Kentucky), flip it: about 80% rocks glasses.
The shapes I'd put on a wedding bar:
- Highballs for vodka sodas, gin and tonics, and whiskey gingers. The Highball Glass, 11.5oz has room for ice and a full mixer pour. More on the shape in highball glasses.
- Rocks glasses for bourbon and an old fashioned signature drink. The Rocks Glass, 10oz has a wide, flat base that sits steady on a crowded bar top. See all rocks glasses.
- Nick and Nora or coupe for a signature cocktail served up. A Nick and Nora's deeper bowl is easier to carry across a dance floor than a wide coupe. Browse our martini glasses, and is Nick and Nora glassware the same as a coupe? explains the difference.
- Toast glasses if you're doing a champagne toast: 1 per guest, on top of the bar count. At a 3oz to 4oz toast pour, a 750ml bottle covers 6 to 8 guests.
Most venues supply glassware or you can rent it, which is usually the practical call for a few hundred glasses. Buying makes sense when you want the signature drink in a specific glass, or want the glasses for your own bar afterward.
How many bartenders for a wedding
Too few bartenders is the wedding bar mistake guests remember. Nobody talks about the brand of gin. Everybody talks about the line.
Our bartender calculator starts from how many guests 1 bartender can keep moving:
| Bar style | Guests per bartender |
|---|---|
| Beer and wine only | 85 |
| Full open bar | 60 |
| Craft cocktail bar | 40 |
Then it adjusts for 3 things:
- Rush-heavy service. If everyone hits the bar at once (right after the ceremony, after toasts, after dinner), each bartender covers 25% fewer guests. Most weddings have at least 1 of those moments.
- Long nights. Over 5 hours, add 1 bartender so people get a break without closing a well.
- Barbacks. Past 75 guests, add 1 barback to run ice, glasses, and backup stock. At 3 or more bartenders, plan 1 barback for every 2 bartenders.
A common shorthand is 1 bartender per 50 to 75 guests. That's a fine gut check; the table above is how to land on an exact number.
Worked examples: 100 and 150 guests
Both examples assume a 5 hour full open bar, 80% of guests drinking, mostly mixed drinks, an indoor reception, and the 15% buffer on.
| 100 guests | 150 guests | |
|---|---|---|
| Drinking guests | 80 | 120 |
| Total drinks | 400 | 600 |
| Beer | 160 drinks, 7 cases | 240 drinks, 10 cases |
| Wine | 120 glasses, 24 bottles | 180 glasses, 36 bottles |
| Liquor | 120 drinks, 8 bottles | 180 drinks, 12 bottles |
| Mixers | 18 liters | 26 liters |
| Ice, indoor | 209 lb (11 bags of 20 lb) | 314 lb (16 bags of 20 lb) |
| Ice, outdoor in heat | 334 lb | 502 lb |
| Wine glasses | 42 | 63 |
| Highballs | 34 | 50 |
| Glasses for drinks served up | 9 | 13 |
| Beer glasses | 23 | 34 |
| Total bar glasses | 108 | 160 |
| Bartenders, steady service | 2 | 3 |
| Bartenders, rush-heavy service | 3 | 4 |
| Barbacks | 1 to 2 | 2 |
2 quick adjustments:
- Beer and wine only: the same 100 guests need 10 cases of beer and 36 bottles of wine; 150 guests need 14 cases and 54 bottles.
- A 6 hour bar: add 1 bartender to each column, and rerun the drinks and ice for the extra hour.
Where couples go wrong
- Counting guests instead of drinking guests, then forgetting the hours. The total comes from both. A 3 hour and a 6 hour reception are not the same order.
- Buying ice for drinks only. The tubs of beer and white wine need their own ice. Outdoors in summer, plan on half again as much.
- Planning glasses for 1 round. People don't hold the same glass all night. Without 1.5 per guest per drink type, the bar runs out of clean glasses during dinner and everything stalls.
- 1 bartender for 150 guests. It looks fine on paper until the ceremony lets out and everyone walks to the bar at the same time.
- A signature cocktail that takes 2 minutes to build. 4 ingredients, a shake, and a fancy garnish is lovely for 20 guests and a line for 150. Pick drinks that can be poured fast or batched ahead.
Wedding bar FAQ
How much alcohol do I need for a wedding of 100 guests? For a 5 hour full open bar with 80 of your 100 guests drinking, plan on about 400 drinks: 7 cases of beer, 24 bottles of wine, and 8 bottles of liquor, plus 18 liters of mixers. That uses 1 drink per drinking guest per hour and a 40% beer, 30% wine, 30% liquor split.
How much ice do I need for a wedding? Plan about 2.1 lb of ice per guest for a 5 hour indoor full bar. That covers ice in drinks, ice for chilling bottles and cans, and a 10% melt buffer. Outdoors, plan about 2.6 lb per guest in mild weather and 3.3 lb per guest in heat. For 100 guests indoors, that's about 209 lb.
How many bartenders do I need for a wedding of 150 guests? For a full open bar with steady service, plan 3 bartenders and 2 barbacks. If most guests will hit the bar at once, such as right after the ceremony, plan 4 bartenders. Add 1 more if the bar is open longer than 5 hours.
How many glasses do I need for a wedding? Plan 1.5 glasses per guest for each drink type they'll drink, plus about 15% extra, because guests set glasses down and take fresh ones and there's rarely time to wash mid-event. A 100 guest full bar uses about 108 bar glasses; 150 guests use about 160. Add 1 toast glass per guest for a champagne toast.
How many bottles of wine do I need for a wedding of 100 guests? At a full open bar, about 24 bottles for a 5 hour reception with 80 drinking guests, since wine is about 30% of drinks and a 750ml bottle pours 5 glasses. At a beer and wine only bar, plan about 36 bottles. Add more for a champagne toast: a bottle covers 6 to 8 toast pours.
How many drinks per person should I plan for at a wedding? Plan about 1 drink per drinking guest per hour. Over a 5 hour reception that's about 5 drinks per drinking guest. The pace is faster in the first hour and slower through dinner, so the hourly average holds up over the whole night.
Do I need a barback for my wedding? Once you pass 75 guests, yes, plan 1 barback. They keep ice, clean glasses, and backup bottles coming so your bartenders never leave the bar. With 3 or more bartenders, plan 1 barback for every 2 bartenders.
Getting married in Louisville or Southern Indiana?
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