Start with drinks, not bottles
Every bad shopping list starts at the store shelf. Every good one starts with a single question: how many drinks will this crowd actually have? The formula is guests times hours times a rate, and the rate depends on who's coming. Here are the rates we plan real events with:
- Corporate or networking: about 0.75 drinks per guest per hour. People are performing professionalism.
- Average wedding: 1 drink per guest per hour. The number to use unless you know your crowd runs different.
- Heavy-drinking wedding or house party: 1.25 per guest per hour. You know if this is your family.
- Cocktail-forward crowd: 1.35. Craft drinkers sip slower but order steadier.
- Full celebration mode: 1.5. New Year's energy, open dance floor, nobody driving.
One more thing the flat one-drink-per-hour rules miss: consumption isn't flat. The first hour runs about half again hotter than the average, then tapers. That doesn't change how much you buy, but it changes staffing and ice, and it's why a bar that's fine at hour three can be slammed at minute twenty.
Split it into liquor, wine, and beer
With a full bar at a wedding, drinks land at about 50% spirits, 25% wine, and 25% beer. Beer and wine only? Plan a 50/50 split. If you're running a softer party with real non-alcoholic options, carve out about a quarter of total drinks for those and shrink the alcohol accordingly. Guests drink what the bar makes easy, so the split follows your menu more than your gut.
The worked example: 100 guests, 4 hours
The full-bar shopping list, step by step
- Total drinks: 100 guests x 4 hours x 1 drink per hour = 400 drinks.
- Split: 200 cocktails, 100 glasses of wine, 100 beers.
- Liquor: a 750ml bottle pours 16 drinks at 1.5oz. 200 pours plus a 10% buffer is 220, so 14 bottles.
- Wine: 5 glasses per bottle at a 5oz pour. 100 glasses plus buffer is 22 bottles. Lean 2 white to 1 red for a summer wedding, closer to even in winter.
- Beer: 100 beers is just over 4 cases of 24, so buy 5.
Total: 14 bottles of liquor, 22 bottles of wine, 5 cases of beer. The same numbers our calculator gives for an average 100-guest crowd, because it's the same engine.
Two upgrades on that list. Buying 1.75L handles instead of 750ml bottles cuts your bottle count roughly in half, since a handle pours 39 drinks. And a champagne toast is its own line: a 750ml bottle pours six 4oz toasts, so 100 guests need about 17 bottles. Or skip the dedicated pour and let everyone raise whatever they're holding. Half the room never finishes a toast pour anyway.
Running beer and wine only?
Same crowd, same 400 drinks, different split: 200 glasses of wine and 200 beers. The wine side works out to 40 bottles before buffer, so buy 44. The beer side is just over 8 cases, so buy 9. If your venue allows kegs, a half barrel pours about 165 beers and replaces almost 7 cases, which saves money and fridge space but locks you into one beer for most of the night. Choose accordingly.
One thing a simpler bar doesn't simplify: bigger bottle counts per category mean more chilling. Forty-four bottles of wine and nine cases of beer take serious cooler space, so the ice number below matters even more without liquor on the menu.
Where wedding bars actually fail
- Buying variety instead of depth. Ten kinds of liquor with one bottle each means nine near-empty bottles and a bar that stalls. Two bottles deep on vodka, whiskey, and tequila beats one bottle wide on everything.
- Forgetting the ice math. Plan 1.5 pounds per guest indoors with a full bar, 2 pounds outdoors. For 100 guests that's 150 to 200 pounds, which is why "we'll grab a few bags" is the most common way home bars die.
- Skipping the buffer. We add 10% on spirits and 15% on mixers. Running out at hour three costs a lot more than an extra unopened bottle you can return or keep.
- Buying it all warm on the day. Beer and white wine need hours to chill. Ice that's busy chilling bottles isn't going in drinks.
Run it on your numbers
The 100-guest example above assumes an average crowd, and yours might not be one. Our drink calculator adjusts the rates, splits, and buffers for your guest count, hours, and bar style, then converts it all to bottles and cases.
And remember: in Pennsylvania you buy this list yourself at store prices, which is the good news. If that sentence is new to you, read how event bartending works in PA first, then check what each package covers. Book Standard or above and the final shopping list comes with your quote, built for your exact menu.