Food and drink for a 120-guest evening wedding, planned as one shopping list

Maya and Theo are getting married next June in a barn venue that lets couples bring their own food and drink. The reception runs from 5:00 to 10:00 pm: a cocktail hour with passed appetizers, a buffet dinner with toasts at 6:00, then dancing until the end, with a late snack table at 9:00. The guest list has settled at 120, and 12 of those are children under twelve. Their caterer will cook and serve but wants the quantities from them, and the venue's bar staff will pour whatever they bring.

That means two calculators and one list. The Catering & Party Food Quantity Calculator sizes the food, and the Wedding & Party Alcohol Calculator sizes the bar. Each tool is simple on its own. The work in this guide is in what you type into each one, because the two tools count guests and hours in different ways, and a reception is not one uniform block of time.

All quantities here are planning estimates, not catering guarantees. Prices in the budget table are placeholders to show the arithmetic; use your own quotes.

Decide who counts before you open either tool

The headcount of 120 is the right number for chairs and place cards. It is the wrong number to type into either calculator without thinking, and the reason is different for each tool.

The catering calculator multiplies every guest by the same ounces per person. It has no field for children, so a ten-year-old gets the same 6 oz of protein as their uncle. Maya and Theo used a common caterer's shortcut instead: count each child as half an adult. That gives 108 adults plus 6 adult-equivalents, or 114 for the food.

The alcohol calculator multiplies guests by a "% who drink" figure. Its 85% default is meant for adults. Typing 120 at 85% would plan drinks for 102 people, which quietly includes most of the children. The cleaner input is 108 adults at 85%, which gives about 92 drinkers. If you would rather keep 120 in the guest box, the equivalent drinking share is 76.5%, and the tool returns exactly the same drink count. The difference shows up in the ice, which the tool calculates per guest in the box rather than per drinker. We come back to that below.

The food: one buffet run, two appetizer runs

The catering tool has two modes, a meal and a cocktail party, and this reception needs both. The mistake to avoid is treating the five hours as one long cocktail party, which would multiply appetizer pieces across hours when everyone is actually eating dinner. Instead, each food service gets its own run.

Service	Inputs	Tool output
Cocktail hour, 5:00	Appetizers: 120 guests, 1 hr, 4 pieces/person/hr, 4 varieties	480 pieces, 120 per variety
Buffet dinner, 6:00	Meal: 114 guests, 6 / 5 / 4 / 3 oz protein / starch / veg / salad	42.8 lb protein, 35.6 lb starch, 28.5 lb vegetables, 21.4 lb salad
Late snack, 9:00	Appetizers: 100 guests, 1 hr, 2 pieces/person/hr, 2 varieties	200 pieces, 100 per variety

The appetizer runs use all 120 guests for the cocktail hour (children graze on passed food as happily as anyone) but only 100 for the late snack, because some families with young kids will have left by 9:00 and the snack is a top-up rather than a meal. Two pieces per person is deliberately light for that reason: sliders and fries after three hours of dancing disappear fast, but nobody needs a second dinner.

One adjustment the tool cannot make for you is the overlap between the cocktail hour and dinner. Guests who have just eaten four appetizers come to the buffet a little less hungry, and the site's guide to adjusting party food quantities suggests trimming the meal ounces when a cocktail hour comes first. Maya and Theo did the opposite: a buffet tends to run heavier than a plated meal, and the two effects roughly cancel, so they left protein at 6 oz. Dropping it to 5 oz would cut the protein to 35.6 lb, which is the number to use if the appetizers are substantial (meatballs, skewers) rather than bite-sized.

Served weight is not purchase weight

The catering tool's results are headed "Served quantities", and that is exactly what they are: weights on a plate. Cooked meat weighs less than raw meat. Boneless cuts typically lose around a quarter of their weight in cooking, and bone-in cuts lose more again. So the 42.8 lb of protein becomes roughly 57 lb raw if it is boneless (42.8 ÷ 0.75), and more if the caterer is roasting bone-in chicken. Starch has the opposite problem: dry rice and pasta roughly double or triple in weight when cooked, so 35.6 lb of cooked rice is only around 12 to 16 lb from the bag. Ask the caterer which basis their own recipes use before you send numbers. Most will want served weights and do the conversion themselves, which is fine, as long as nobody converts twice.

The bar: a whole-night run and a phase-by-phase run

The simplest bar plan is one run of the alcohol calculator for the whole evening: 108 guests, 5 hours, 85% drinking, 0.85 drinks per drinker per hour, split 40% beer, 35% wine, 25% liquor. The existing guide to how much alcohol to buy for a wedding explains where those defaults come from, so this one only runs them.

The tool returns 390 drinks for about 92 drinkers: 156 beer servings (7 cases), 137 glasses of wine (28 bottles) and 98 cocktails (6 bottles of liquor). For comparison, 4 hours at the same rate gives 312 drinks, so the fifth hour of reception is worth about 78 drinks, or a case of beer, six bottles of wine and a bottle of spirits.

The whole-night run hides one thing that matters at this reception: the mix changes during the evening. People drink beer and cocktails at the 5:00 cocktail hour, wine at dinner, and beer and cocktails again on the dance floor. So Maya ran the tool three times, once per phase, with a different mix and pace for each.

Phase	Hours	Drinks/hr	Beer / wine / liquor	Servings out
Cocktail hour	1	1.2	45 / 20 / 35	50 beer, 22 wine, 39 cocktails
Dinner and toasts	1.5	0.6	20 / 70 / 10	17 beer, 58 wine, 8 cocktails
Dancing	2.5	0.8	45 / 20 / 35	83 beer, 37 wine, 64 cocktails
Total	5			150 beer, 117 wine, 111 cocktails (377 drinks)

The total, 377 drinks, is close to the single run's 390, because the phase paces average out to about 0.82 drinks per hour. The split is what moved: fewer glasses of wine and more cocktails than the 40/35/25 default suggested.

There is a trap in reading the per-phase results, though. Each run rounds up to whole cases and bottles on its own, so the three runs together say 8 cases of beer, 25 bottles of wine and 8 bottles of liquor. That rounds up three times. Add the servings first and convert once: 150 beers is 6.25 cases (buy 7), 117 glasses is 23.4 bottles (buy 24), and 111 cocktails at 1.5 oz is 6.6 bottles (buy 7). Running the tool per phase is useful for the mix, not for the rounding.

Where the alcohol model stops being accurate

Reading the calculator's code shows exactly what it assumes, and four of those assumptions matter here.

• Pour sizes are fixed. Beer is counted as 24 servings per case, wine as 5 glasses per 750 ml bottle, and liquor as 1.5 oz per drink from a 25.4 oz bottle, which is about 17 drinks. A bartender pouring 6 oz of wine gets about four glasses a bottle, which would turn 24 bottles into 30. Ask the bar staff what pour they use.
• The champagne toast is not in it. A toast is one pour per adult, regardless of who otherwise drinks. At roughly six 4 oz flutes per 750 ml bottle, 108 adults need about 18 bottles of sparkling wine, as a separate line.
• Ice is per guest in the box, not per drink. At 108 guests and 1 lb each the tool says 108 lb. That forgets the 12 children's soft drinks and any tubs used to chill bottles. For a June evening, Maya entered 120 guests at the equivalent 76.5% drinking share and 1.5 lb of ice each: the drink count stays 390 and the ice becomes 180 lb.
• Non-drinkers get nothing. The tool only sizes alcohol. Sixteen non-drinking adults and 12 children over five hours at roughly one soft drink an hour is about 140 servings of soda, juice, sparkling water or a mocktail, before water. That is a short line on the list, but it has to be there.

Where the food model stops being accurate

The catering calculator is even simpler: guests × ounces ÷ 16, and guests × pieces × hours ÷ varieties. That makes its blind spots easy to list. It has no safety margin built in; the usual 10% buffer is yours to add. It treats more appetizer varieties as the same total spread thinner, when in practice more choice means people take a bit of everything. And it has no line for bread, dessert or the wedding cake, which are counted per person (one roll, one slice) rather than by weight.

Timing also links the food and the bar. A buffet at 6:00 that runs late means the cocktail hour stretches, and a cocktail hour that stretches from one hour to an hour and a half adds about half again to the appetizer count (720 pieces instead of 480) and about 55 drinks at the 1.2 pace. If the venue's schedule is soft, plan the appetizers for 90 minutes.

One list, one budget

Putting the runs together with the adjustments above gives the full list. The prices are placeholders so the arithmetic is visible; replace them with your caterer's and store's quotes.

Item	Quantity	Placeholder unit price	Line total
Appetizers, cocktail hour	480 pieces	$1.50 / piece	$720
Buffet protein (boneless, raw)	57 lb	$7.00 / lb	$399
Starch, vegetables, salad (served)	85.5 lb	$2.50 / lb	$214
Late snack	200 pieces	$1.25 / piece	$250
Beer	7 cases	$30 / case	$210
Wine	24 bottles	$12 / bottle	$288
Liquor	7 bottles	$25 / bottle	$175
Sparkling wine for the toast	18 bottles	$12 / bottle	$216
Soft drinks and mixers	about 140 servings plus mixers	$0.75 / serving	$105
Ice	180 lb	$0.40 / lb	$72

At those placeholder prices, food is about $1,580 and drink about $1,070 before service, rentals and the cake. Whatever your real prices, the shape tends to hold: the cocktail-hour appetizers and the buffet protein are the two biggest food lines, and on the bar side it is wine plus the toast. Those four lines are where a quote is worth negotiating. The guide to the wedding bar budget covers buy-back policies and bar formats, which change the drink side more than any quantity tweak.

The checks Maya and Theo ran before sending the list

• Final headcount. Both tools scale linearly, so a late change from 120 to 130 guests is roughly 8% more of everything. Re-run both rather than estimating.
• Kids' share. If the children are mostly teenagers, count them as adults for food and keep them out of the drinking share.
• Who pours. Trained bar staff who pace service, offer water and stop serving anyone who has had enough are part of the plan, not an extra. Many venues, and some states, require trained or licensed servers at events with alcohol.
• What can go back. Unopened bottles and cases are often returnable, and leftover food mostly is not. That asymmetry is the reason to round the bar up and keep the food close to the calculated figure plus 10%.

The two calculators answer narrow questions: how many pounds, how many pieces, how many drinks. The planning that turns them into a usable list happens in the inputs, where you decide whom to count, which hours to count them for, and what the tool leaves out. Run the food quantities per service and the bar quantities per phase, total the servings before you round, and the list will match the evening you are actually hosting.