Wedding alcohol calculator: how many bottles for 100 guests, and why every site gives you a different number
There are two ways to get this number wrong, and both of them are visible to your guests. The first happens at 11pm, when the bartender catches your eye and mouths that the vodka is gone. The second happens the next morning, in the trunk of somebody’s car: four cases of unopened wine that nobody wants and, depending on your state, nobody will take back.
Somewhere between those two is the right number. The trouble is that if you go looking for it, you will find about seven right numbers, all different. One guide says a quarter liter of wine per guest. Another says a full liter. That is not a rounding difference. At a 100-person wedding it is a hundred bottles.
Below is the calculator, the formula it runs on written out in the open, and an explanation of why the published estimates contradict each other so badly.
The short version
- The formula is drinking adults × hours of reception × party style. Duration matters more than anything else, and it is the input most calculators never ask for.
- For 100 drinking adults at a five-hour reception: 46 bottles of wine, 150 beers, 9 bottles of liquor, with water counted separately across every guest.
- Published estimates range from 250 ml to 1,000 ml of wine per guest, and from 47 ml to 500 ml of liquor. The highest numbers come almost exclusively from sites that sell drinks.
- Count drinking adults, not invitations. Children drink none, and 15 to 20 percent of adults drink no alcohol.
- Water works the other way around, counted across everyone: one liter per guest per four hours.
- The number nobody plans for is glassware. A 120-guest wedding needs 180 wine glasses, not 120, because nobody washes them between courses.
[!CALCULATOR]
The formula, step by step
Nothing here is proprietary. You can run it on a napkin, and if you want to check the calculator above, this is exactly the path it takes.
Step 1. Total drinks.
drinks = drinking adults × hours × style
Style is 0.5 for a quiet, older, dinner-focused crowd, 1.0 for a typical reception, and 1.5 for a young group that closes the room. At 100 adults, 5 hours and standard style, that is 500 drinks.
Step 2. Split by category. 45 percent wine, 30 percent beer, 25 percent liquor. Within the wine, 50 percent white, 30 percent rosé, 20 percent red.
Step 3. Drinks into bottles. A 750 ml bottle of wine pours 5 glasses. A bottle of liquor pours about 15 measures. Add 1.5 bottles of mixer for every bottle of liquor.
Step 4. Water, the one line counted across all guests including children: one liter per person per four hours, 70 percent still and 30 percent sparkling.
One important caveat about that split
The 45/30/25 split is a European profile, wine first. American open bars do not look like that. The Knot puts the mix at 50 percent liquor, 25 percent beer and 25 percent wine, which is a fair description of a full open bar with a signature cocktail and a busy bartender.
Both can be right, because they describe different parties. If yours is a seated dinner with wine on the table, use the calculator as it stands. If yours is a cocktail reception with a full bar, move roughly 15 percent of the total from wine into liquor before you shop. The total number of drinks does not change; only what they are poured from.
What it looks like at a real wedding
A 120-guest wedding. Fifteen children and a handful of adults who do not drink, so the alcohol math runs on 100 adults and the water math runs on all 120. Cocktail hour at 6, last call at 11, so five hours.
| What you buy | Amount |
|---|---|
| White wine | 23 bottles |
| Rosé | 14 bottles |
| Red wine | 9 bottles |
| Wine, total | 46 bottles |
| Beer | 150 cans or bottles |
| Liquor | 9 bottles (about 6.5 liters) |
| Mixers | 14 bottles |
| Still water | 105 liters |
| Sparkling water | 45 liters |
| Total weight to move | 660 lbs (300 kg) |
That last line is not a joke. It is a third of a ton of glass and liquid, and it does not fit in one car.
What everyone else estimates
I took the calculators and guides that rank first in English, Romanian and Hungarian, and converted every published figure to the same unit. This is what came out.
| Source | Market | Wine | Liquor | Beer | Sparkling |
|---|---|---|---|---|---|
| theknot.com | US | ~190 ml | ~110 ml | ~1.25 drinks | 125 ml |
| yalco.ro | RO | 250 ml | 47–70 ml | not stated | 150 ml |
| vinenunta.ro | RO | 500 ml | 200–250 ml | 330 ml | 100 ml |
| selfevents.ro | RO | 500–1,000 ml | 250–300 ml | not stated | 110–125 ml |
| habosbabos.hu | HU | 400–600 ml | 50–70 ml | 1,500–2,500 ml | not stated |
| alkoholshop.hu | HU | 1,000 ml | 500 ml | 1,500 ml | in the wine figure |
| This calculator | US, 5 h | 340 ml | 63 ml | 490 ml | see below |
Four times the difference on wine. More than ten times on liquor. Not because some of these people are careless, but for two reasons that none of those pages puts on the page.
Every source has a different reception length in mind, and does not say so. The Hungarian guide counts on eight hours. The Knot’s worked example runs five. The Romanian pages state no duration at all. Divide each figure by its own hours and the disagreement mostly dissolves: The Knot lands at 42 ml of wine per hour, the Hungarian guide at 63, this calculator at 68. The headline numbers fight. The rates barely do.
It matters who is counting. The two most generous rows, 500 ml and 250 to 300 ml of liquor per guest, come from an online liquor store and an event company. The most conservative, 47 to 70 ml, comes from a hospitality supply blog with nothing to sell a bride. That is not bad faith, it is just each business seeing its own customers. The difference is on your card either way.
Reception length changes everything
If you take one thing from this article, take this one.
An American reception runs four to five hours and ends around midnight. A Romanian or Hungarian wedding starts at eight in the evening and finishes at four or five in the morning, which is nine or ten hours of drinking. Most English-language calculators are built on the American assumption and never mention it.
That cuts both ways. If you are planning a US reception with a European guide, you will overbuy by nearly half. If you are planning a long reception with an American calculator, you will run dry before the party is over, which is the failure mode people actually remember.
This is why duration is the second question in the calculator above, ahead of season and ahead of preferences. A season shifts about ten percent of your wine from one color to another. Four extra hours multiplies everything by 1.8.
Four things the calculator cannot know
The tool above gives you an honest market baseline. What follows moves it, and only you have the information.
The menu moves wine between colors. Beef, lamb or duck pushes red up by about 15 percent of the wine allocation, taking it from white. Fish or chicken pushes white up by 10 percent. A cheese course adds a little red. The total volume of wine does not change, only the split, and getting it wrong is visible: twenty unopened bottles of white while people ask the bar for red.
Heat doubles the water, not the beer. For an August wedding where the afternoon high sits near 90°F (32°C), the water line from any calculator is too low. Just double it. It is the cheapest item on the list and the first one to run out.
Service style changes the minimum, not the total. If you are putting bottles on tables rather than running a bar, per-guest math stops working at small tables: you need at least one bottle of white, one of red and one of liquor per table, plus two liters of water, even at a table of six who barely drink. A table with no bottle on it reads as a forgotten table. A staffed bar removes that problem and adds another, since consumption shifts toward liquor and mixers.
Not everyone on the list drinks. Between 15 and 20 percent of adults do not, and children do not at all. If you already know how many guests actually show up, subtract children and non-drinkers from that number, and only then use the calculator. If you are weighing a child-free wedding, note that removing children raises the drinking share of the room, so the bar bill does not fall as fast as the head count.
Glassware, the number nobody plans
Every calculator tells you how many bottles. None of them tells you how many glasses, which is how you end up serving cabernet in a water tumbler.
The rule does not depend on duration, only on head count. 1.5 wine glasses per guest, because people switch from white to red between courses and nobody is washing glassware mid-dinner. 1.5 highballs per guest, used constantly all night for water and mixed drinks. 1.1 flutes, because at the toast every guest holds one at the same moment and a few get broken.
For 120 guests that is 180 wine glasses, 180 highballs and 132 flutes. If you are renting, order against those numbers rather than the guest count. If the venue supplies glassware, ask how many they actually have, not whether they have it.
Buying it yourself versus the venue package
Here the math turns from liters into money.
A full open bar in the US runs roughly $45 to $100 per person in 2026, and beer and wine only runs $25 to $45. The bar typically lands at 8 to 12 percent of the total budget, which is worth checking against how to budget for a wedding before you assume it is a rounding error.
Supplying it yourself is usually cheaper on paper, and there are two questions that decide whether it stays cheaper in practice.
What is the corkage fee? A venue that lets you bring your own will usually charge per bottle opened. At the 69 bottles in the example above, a per-bottle fee erases the wholesale saving quickly, and it comes with delivery, refrigeration and someone to pour. It is one of the wedding budget traps that only shows up on the final invoice.
Will the store take back what you do not open? This is the single biggest lever in the US and it is entirely local. Some stores run buyback or open a tab and charge only for what does not come back. New Hampshire’s state stores accept up to $100 back within 30 days. Kansas prohibits alcohol returns outright. Delaware exempts alcohol bought for a licensed gathering from its return restriction. There is no national rule, so ask your store directly and get the answer before you buy, not after. If returns are available, buy generously; if they are not, buy to the calculator and no more.
How our app helps
The drinks calculator on this page is completely free to use, and it gives you a safe, industry-standard baseline. Guest count, reception length and party style are all it asks for, and for a first estimate those numbers will keep you out of trouble.
What a blog page cannot do is read your wedding. It does not know that you are serving beef rather than fish, which moves your red-to-white ratio. It does not know that the August average at your venue is 88°F (31°C), which doubles the water. And it does not know whether you are running a staffed bar or putting bottles on tables, where a per-table minimum applies that per-guest math never reaches.
That is what the Virtual Sommelier & Bar Calculator does, in the WeddingReimagined Premium tier: a one-time payment of €50, not a subscription.
Your guest count comes from your confirmed RSVPs, and you can override it with the number of adults who actually drink. The tool reads your menu as text, with keyword detection in English, Romanian and Hungarian, and shifts the red-to-white allocation on its own. The date and venue pull average temperatures from previous years, and above 82°F (28°C) the water allocation doubles. Season rebalances rosé against red. Serving style sets the per-table floor. What you get is a shopping list with the arithmetic still visible behind it, so you do not run out of vodka at midnight and do not leave thousands sitting in wine nobody drank.
Two articles that pair well with this one: how many guests fit at a wedding table and five wedding budget traps to avoid.
Frequently asked questions
How much alcohol do I need for 100 wedding guests?
For 100 drinking adults at a five-hour reception, roughly 46 bottles of wine, 150 beers and 9 bottles of liquor, plus mixers. Water is counted separately across all guests at one liter per person per four hours. If your reception runs nine or ten hours, as it does in much of Europe, nearly double the alcohol.
How many bottles of wine per wedding guest?
About one bottle for every two drinking adults at a long reception, or roughly one for every three at a four to five hour American reception. In volume that is 0.3 to 0.7 liters per person depending entirely on how long the party runs, which is why any figure quoted without a duration attached is close to meaningless.
How much liquor per person at a wedding?
Around 60 ml per drinking adult at a five-hour reception, or one 750 ml bottle for every twelve people. Published recommendations range from 47 ml to 500 ml per guest, and the highest of them come from businesses that sell alcohol. If you are running a full open bar with cocktails rather than a wine-led dinner, plan nearer the top of the range.
Do I count all my guests or only the ones who drink?
Alcohol is counted only on drinking adults, which is usually 80 to 90 percent of the adult list once you remove children and non-drinkers. Water, soft drinks and coffee are counted across everyone. Getting this backwards is the most common mistake, and it is expensive because it always errs high.
Is it cheaper to buy your own alcohol for a wedding?
Usually yes on paper, and it depends on two answers: the corkage fee, and whether unopened bottles can be returned. A per-bottle corkage fee at a hundred-bottle wedding can erase the entire wholesale saving. Return policies vary by state and by store, so confirm both in writing before you place an order.
How many glasses do I need to rent for a wedding?
1.5 wine glasses per guest, 1.5 highballs and 1.1 champagne flutes. At 120 guests that is 180, 180 and 132. You do not rent one per guest, because people change glasses between courses and everyone holds a flute at the same moment during the toast.