Wedding bar math is simple once you count drinks first and bottles second. Here is the method, the common rule of thumb and the adjustments that matter.
Before you can count drinks, you need to agree on what one is. The CDC describes a U.S. standard drink as containing 14 grams of pure alcohol, which works out to roughly 12 ounces of beer at 5 percent alcohol by volume, 5 ounces of wine at 12 percent or 1.5 ounces of 80 proof spirits. Bartenders pour to those measures, so planning in standard drinks keeps your estimate honest.
A heavy pour, a big wine glass or a double cocktail can hold more than one standard drink. Mention that to your bar team when you plan, because quantities built on standard drinks run short if the bar pours generously.
Wedding planning guides tend to agree on a simple pattern: about two drinks per guest in the first hour, then about one drink per guest for each hour after that. One published guide applies it to a five-hour reception and lands on roughly five to six drinks per guest in total. Treat this as a starting point drawn from planning advice, not a law or a measured average.
The pattern assumes every guest drinks. Real guest lists include non-drinkers, drivers, children and people who nurse one glass all night. Those guests pull the total down, which is why a rule of thumb makes a better ceiling than a forecast.
Planning guides also point out that the first hour is when guests are most excited, which is why it carries the extra drink. After dinner the pace tends to settle, though a lively dance floor can lift it again.
Once you have a drink total, divide it by what each container yields. A 750 milliliter bottle of wine holds about five glasses at a 5 ounce pour. A 750 milliliter bottle of spirits holds roughly 16 to 17 pours at 1.5 ounces, which is the arithmetic of 25.4 fluid ounces divided by 1.5. Beer is simplest, since one 12 ounce can or bottle is one drink.
Cocktails complicate the picture because one drink may use a single measure of spirit or two. Ask the bar team how much spirit goes into each recipe on your menu, and base your bottle count on that rather than on a generic pour.
| Container | Typical yield | Basis |
|---|---|---|
| 750 ml bottle of wine | About 5 glasses | 5 oz glass |
| 750 ml bottle of spirits | About 16 to 17 drinks | 1.5 oz pour |
| 12 oz can or bottle of beer | 1 drink | Standard serving |
Imagine 100 guests and a five-hour reception. Using two drinks in hour one and one drink for each of the four hours after that gives six drinks per guest, or 600 drinks for the night. This is an illustration of the arithmetic, not a forecast for your event.
Now split those drinks by what your crowd prefers. If you expect half to be wine, that is 300 glasses, which at five glasses per bottle is 60 bottles. The other 300 drinks get divided between beer and spirits in whatever mix you expect. Repeat the math for each category, then round up a little.
Once you have a total, you still have to divide it. The right split follows your crowd rather than a formula. A guest list that skews toward wine drinkers needs more wine, and one that loves craft beer or cocktails will shift the balance. If you have a sense of your friends and family, use it, and ask the venue or bar team what they have seen at similar events.
A narrow menu makes the split easier to guess. When you offer beer, wine and a single signature cocktail, guests spread across three choices, and you can estimate each with more confidence than you could for a menu with a dozen options.
Every crowd drinks differently, and a few factors move the total more than anything else. Think through each one before you place an order.
The shopping list matters only if you are the one shopping. In some states a host can buy alcohol and hire bartenders to serve it. In others, a licensed caterer or bar service has to supply it, and you pay for what is poured or for a package. Read our guide to liquor licenses for private events before you load a cart.
If a bar service supplies the alcohol, ask whether pricing is per person, per hour or per drink. The choice of structure affects how much you need to forecast, and it is covered in open bar vs cash bar vs drink tickets.
If a vendor handles the alcohol, ask to see the bar's own estimate and compare it with yours. A professional crew has seen many receptions and can spot a gap in your plan, such as too little beer for an afternoon event or too much red wine for a summer crowd. Their numbers are a useful second opinion even when you do your own math.
Running out of wine at the cake cutting is a worse outcome than finishing with a few extra bottles. If you control the purchase, round up, and ask the seller or venue about their return policy on unopened bottles before you buy. Policies differ by seller and by state, so confirm it rather than assuming.
Give your bartenders the final headcount, the schedule and your menu a week out. If you are working with a mobile bar, the wedding bar service page explains how planning with an operator works.
Bottles are only part of a bar. Cocktails need mixers, citrus, garnishes and ice, and non-drinkers need water and soft drinks. Ice is the item that most often runs short, particularly at outdoor receptions in warm weather, so ask the vendor how much they bring and how they restock.
Glassware and cups count too. Ask whether the bar provides them, how many per guest are planned and what happens to dirty glasses during the night.
A common planning rule is about two drinks per guest in the first hour and one per hour afterward. Adjust it for the guest mix, the time of day and whether a meal is served.
A 750 milliliter bottle yields about five glasses at a 5 ounce pour.
A 750 milliliter bottle gives roughly 16 to 17 pours at 1.5 ounces. Cocktails with more than one measure of spirit use up a bottle faster.
Yes, within reason. A small surplus costs less than running out, but check return policies before you buy.
Send the basics and the operator will confirm whether your date, venue and bar setup line up.