Planning alcohol for a party comes down to one formula: budget one drink per guest for the first hour, then one more drink per guest for every additional hour after that. The number changes fast once you factor in what's actually in the room — a backyard barbecue with mostly beer drinkers needs a different case count than a champagne toast for 40 people in 2026.
- Plan one drink per guest for hour one, then one drink per guest per additional hour — a 4-hour party for 25 guests needs about 100 drinks.
- A 750ml wine bottle pours 5 glasses; a 750ml spirits bottle pours about 17 shots; a beer case holds 24 cans.
- Split the total roughly 40% beer, 30% wine, 20% spirits, 10% champagne for a mixed adult crowd.
- Miramar Wine & Liquor covers last-minute shortfalls with same-day San Diego delivery so you're not stuck mid-party.
Why this matters
Most people either buy way too little and run out by 9pm, or way too much and end up with a liquor cabinet full of leftovers for a year. Neither is a real problem if you do the math up front instead of guessing at the store. Miramar Wine & Liquor sees the same pattern every weekend: hosts either overbuy beer and underbuy wine, or forget champagne entirely until the toast is happening.
The fix isn't complicated. Guest count times party length gives you total drinks. From there you split by category based on who's actually coming.
How to plan alcohol for a party
Start with two numbers: guest count and party length in hours. Multiply them to get total drinks needed, using the one-drink-per-guest-per-hour rule as your baseline.
| Guests | 2-hour party | 4-hour party | 6-hour party |
|---|---|---|---|
| 10 | 20 drinks | 40 drinks | 60 drinks |
| 25 | 50 drinks | 100 drinks | 150 drinks |
| 50 | 100 drinks | 200 drinks | 300 drinks |
That total drink count is your shopping target for 2026. From there, split it into categories based on your guest list — a 30th birthday full of beer drinkers looks nothing like a bridal shower running mostly on wine and champagne.
For a mixed adult crowd with no strong preference either way, a common split caterers use is roughly 40% beer, 30% wine, 20% spirits, 10% champagne. Adjust up or down for the group you actually know is coming.
Wine: 5 glasses per 750ml bottle
A standard 750ml wine bottle pours five 5-ounce glasses. If wine covers 30% of a 100-drink party, that's 30 glasses, or roughly 6 bottles. Buy 1 bottle of wine for every 4-5 wine drinkers at a 3-hour party.
Spirits: about 17 shots per 750ml bottle
A 750ml bottle of vodka, tequila, or whiskey pours about seventeen 1.5-ounce shots — enough for cocktails or shots for a crowd that likes to drink liquor straight. If spirits cover 20% of a 100-drink party, that's 20 pours from just over 1 bottle. One bottle of Tito's Handmade Vodka 1L covers roughly 22 pours on its own.
Beer: 24 cans per case covers about 10-12 guests
A standard case holds 24 cans or bottles. At one drink per hour, a case covers 10-12 guests through a 2-hour party, or 6 guests through a 4-hour one. Beer is also the easiest category to overbuy on impulse — a case of Modelo Especial 18-pack cans plus a backup case handles most backyard gatherings without a second run to the store.
Champagne: 6 glasses per 750ml bottle
A 750ml bottle of champagne pours about six 4-ounce glasses — the standard toast pour, not a full wine glass. For a 40-person toast, plan on 7 bottles minimum, and add 1-2 extra bottles if guests are drinking champagne as their main pour rather than just toasting. Moet & Chandon Brut Rose Imperial 375ml works well when you need smaller-format bottles for a mixed bar setup.
Why alcohol quantities vary
The formula above is a starting point, not a fixed rule. Adjust based on these factors:
- Guest demographics — a 20s-30s crowd typically drinks more per hour than an older or mixed-age group.
- Event length — the first hour always runs heavier than hour four; energy and pace change as the night goes on.
- Food service — a full dinner slows drinking pace versus a cocktail hour with light snacks.
- Season and setting — outdoor daytime parties in warm weather push beer and seltzer consumption higher.
- Non-drinkers — count them out of your drink total, but stock a few non-alcoholic options anyway.
- Designated drivers and rideshare access — easier exits mean guests tend to drink a bit more over the course of the night.
“Guest count times party length gives you the number. Everything else is just splitting that number by category.”
How many bottles of wine do you need for 20 guests?
For 20 guests at a 3-hour party where wine covers about 30% of the pour, plan on 6-7 bottles of wine in 2026 pricing and pour sizes. Add 1-2 extra bottles if the group leans heavily toward wine over beer or spirits.
How much beer do you need for a party of 30?
For 30 guests at a 4-hour party with beer covering roughly 40% of total drinks, plan on 5 cases (120 cans) as a baseline. Cut that to 3-4 cases if wine and spirits are carrying more of the crowd.
Should you buy extra alcohol for a party?
Yes — buy 10-15% more than your calculated total, since running out mid-party is worse than having a few bottles left over. Most retailers, including Miramar Wine & Liquor, accept returns on unopened bottles, so overbuying slightly carries less risk than underbuying.
If a shortfall does happen mid-event in the San Diego area, same-day local delivery covers the gap faster than a store run. That's the practical backstop behind the math above, not a substitute for doing it.
FAQ
How many bottles of wine do I need for 20 guests?
Plan on 6-7 bottles of wine for 20 guests at a 3-hour party where wine covers roughly 30% of total drinks. Add a bottle or two if the group leans heavily toward wine.
How much beer should I buy for a party of 30?
Buy about 5 cases (120 cans) for 30 guests over a 4-hour party if beer covers roughly 40% of total drinks. Scale down to 3-4 cases if wine or spirits are covering more of the crowd.
How many shots are in a 750ml bottle of tequila?
A 750ml bottle pours about 17 shots at a standard 1.5-ounce pour. That number holds for most spirits, not just tequila.
Should I buy extra alcohol for a party?
Yes, buy 10-15% more than your calculated total since running short mid-party is worse than having bottles left over. Unopened bottles can usually be returned or saved for the next gathering.
How much champagne do I need for a toast?
One 750ml bottle of champagne pours about 6 toast-sized glasses at 4 ounces each. For 40 guests, plan on 7 bottles minimum for a single toast round.
Do I need more beer or wine for a backyard party?
Beer usually wins at outdoor daytime parties, especially in warm weather, so lean the split toward 40-50% beer. Indoor evening events tend to shift more toward wine and spirits.
What's the best way to stock a bar for 50 guests?
For 50 guests at a 4-hour party, budget 200 total drinks split roughly 40% beer, 30% wine, 20% spirits, 10% champagne. That works out to about 8 cases of beer, 12 bottles of wine, 3 bottles of spirits, and 3 bottles of champagne.
One last thing
The category people underbuy most isn't beer or wine — it's spirits mixers and ice. A bottle that pours 17 shots is useless without enough soda, juice, or tonic to build the drinks around it, and most hosts forget to double the mixer order when they double the liquor order. Run the same one-drink-per-guest-per-hour math on mixers and ice as you did on the alcohol itself before finalizing your 2026 party list.
