Event Coffee Calculator: How Much Coffee for 100 People (or Any Crowd)
Enter your attendees, the coffee breaks you're serving and who drinks what. Get cups and gallons for each break, pounds of ground coffee, how many urns or servers to fill, and the cups, lids, creamer and sugar to order. Built for conference, meeting, expo and church or community event planners.
Plan Coffee for Every Break
15.8 gal
Coffee to brew
252 cups: 202 regular (12.6 gal) and 50 decaf (3.1 gal).
7.3 lb
Ground coffee
5.8 lb regular, 1.5 lb decaf, at 55 g per liter.
7
1.5-gallon servers, busiest service
17 fills over the event, decaf and hot water separate.
3.7 gal
Hot water for tea
59 cups, 59 tea bags.
| Service | Coffee | Decaf | Tea | Fills |
|---|---|---|---|---|
| Morning arrival6.8 gal coffee | 108 | 22 | 25 | 7 |
| Morning break4.5 gal coffee | 72 | 14 | 17 | 5 |
| Afternoon break4.5 gal coffee | 72 | 14 | 17 | 5 |
Cups per service for one day. Coffee includes decaf. Fills are 1.5-gallon servers for regular, decaf and hot water.
| Hot cups | 311 |
|---|---|
| Lids (skip for mugs) | 311 |
| Stirrers | 311 |
| Sugar or sweetener packets | 311 |
| Single-serve creamers | 252 (or 3 qt half-and-half) |
| Tea bags | 59 |
The formula
Attendees × coffee share × cups per drinker × (1 + buffer) = cups per service.
Cups × cup size ÷ 128 oz = gallons.
Gallons × 3.785 L × 55 g ÷ 453.6 g = pounds of ground coffee.
Gallons ÷ container size, rounded up = urns or servers to fill.
Planning estimate, not a catering quote. The shares, cups and brew ratio are editable assumptions; your caterer or venue confirms the order. Planning the rest of the menu? Use the event food calculator for meals and snacks and the event drink calculator for a bar.
How the Event Coffee Calculator Works
Worked through at the defaults: 100 attendees, three coffee services, 8 oz cups.
1. Count coffee and tea drinkers
65% of 100 attendees drink coffee (65 people) and 15% take tea or hot water (15 people). Both shares are planning assumptions: change them for your crowd.
2. Cups for each service
Morning arrival: 65 x 1.5 cups x 1.1 buffer = 108 cups. Each break: 65 x 1 x 1.1 = 72 cups. That is 252 cups of coffee for the day, 20% of them decaf (50 cups).
3. Turn cups into gallons
A gallon is 128 oz, or sixteen 8 oz cups. 252 cups x 8 oz / 128 = about 15.8 gallons of coffee: 12.6 regular and 3.1 decaf. Tea drinkers need 59 cups, about 3.7 gallons of hot water.
4. Work out the ground coffee
This calculator brews at 55 g of coffee per liter, about 0.46 lb per gallon, so 1 lb makes about 2.2 gallons. 12.6 gallons of regular takes 5.8 lb and 3.1 gallons of decaf takes 1.5 lb: 7.3 lb in all.
5. Count urns, cups and condiments
Fill regular, decaf and hot water in separate containers. With 1.5-gallon servers, arrival needs 7 (4 regular, 1 decaf, 2 hot water) and each break 5. Order one cup, lid, stirrer and sugar packet per hot drink (311) and one creamer per coffee (252).
Planning the rest of the day? Size meals and snacks with the event food calculator, a bar with the event drink calculator and the cups and packaging left behind with the event waste calculator. Put coffee timing and catering deadlines on your conference planning checklist.
Urn and Server Sizes
Capacities used in the calculator, in 8 oz cups. Rental and caterer equipment varies, so check the label or ask your caterer what they bring.
| Container | Gallons | 8 oz cups |
|---|---|---|
| 2.2 L airpotAbout 74 oz, nine 8 oz cups. Good for small meetings and decaf. | 0.6 | 9 |
| 1.5-gallon server192 oz, twenty-four 8 oz cups. A common catering size. | 1.5 | 24 |
| 3-gallon server384 oz, forty-eight 8 oz cups. | 3.0 | 48 |
| 100-cup urnMany urn makers count 5 oz cups, so 100 cups is about 3.9 gallons (62 cups of 8 oz). Check the label. | 3.9 | 62 |
Keep Coffee Lines Moving
The busiest pour is morning arrival, right when people are also checking in. Open coffee before registration gets busy, set stations away from the check-in desks, and split large crowds across two or more stations with cups, condiments and decaf at each. Serving from both sides of a table moves a line faster than one side. If your check-in is the bottleneck, our event check-in software helps clear it.
Place Coffee Stations on Your Floor Plan with Map D
Map D doesn’t order coffee or manage catering. It helps with where the coffee goes: in Map D’s floor plan editor you can mark coffee stations and break areas with named areas and furniture tables on a floor plan drawn to scale, so lines don’t block registration, session doors or exhibitor booths. Expo and trade show layouts start in our event floor plan software. You can build one event’s floor plan free; publishing and sharing it needs a paid plan, with Basic starting at $3,499 (plus a one-time $250 onboarding fee).
Coffee for Common Crowd Sizes
One day with a morning arrival and two breaks at this calculator’s defaults: 65% drink coffee, 1.5 cups at arrival and 1 per break, 8 oz cups, 20% decaf and a 10% buffer. Urns are 100-cup urns (about 3.9 gallons) at morning arrival, counting regular, decaf and hot water separately.
| Attendees | Cups of coffee | Gallons | Ground coffee | 100-cup urns |
|---|---|---|---|---|
| 25 | 67 | 4.2 | 2.1 lb | 3 |
| 50 | 129 | 8.1 | 3.8 lb | 3 |
| 100 | 252 | 15.8 | 7.3 lb | 4 |
| 150 | 378 | 23.6 | 10.9 lb | 5 |
| 200 | 501 | 31.3 | 14.4 lb | 5 |
| 300 | 752 | 47.0 | 21.7 lb | 9 |
| 500 | 1,253 | 78.3 | 36.1 lb | 11 |
For 25 or 50 people, airpots or 1.5-gallon servers fit better than 100-cup urns; switch the container in the calculator above.
What this assumes
Every figure the calculator starts with, and where it comes from. Where the honest answer is that a number depends on your venue, it says so rather than inventing one.
- Who drinks coffee and tea
- 65% of attendees drink coffee at a service and 15% take tea or hot water instead (the rest skip it or drink water). These are this calculator's planning assumptions, not survey data: an early-morning conference may run higher, an afternoon community event lower.
- Cups per service
- 1.5 cups per drinker at morning arrival (the busiest pour, with refills) and 1 cup at each of the morning and afternoon breaks, plus a 10% buffer for refills, spills and late arrivals. Enter 0 to skip a service.
- Cup size and gallons
- 8 fl oz poured per cup. 1 US gallon = 128 fl oz = sixteen 8 oz cups, and 1 gallon is about 3.785 liters (NIST). Decaf defaults to 20% of coffee cups and gets its own containers.
- Brew ratio
- 55 g of ground coffee per liter of brewed coffee, a medium-strength ratio this calculator uses for planning. That works out to about 0.46 lb a gallon, or 1 lb for every 2.2 gallons (about 35 cups of 8 oz). Use your caterer's or roaster's ratio if they give you one.
- Cups, lids, creamer and sugar
- One cup, lid, stirrer and sugar packet per hot drink, one single-serve creamer (3/8 oz) per coffee and one tea bag per tea or hot water cup. These are planning rules of thumb that err on the generous side; skip lids if you serve in mugs at seated meetings.
What it does not model
- Brewing time and equipment. A large urn can take most of an hour to brew; ask the caterer or venue how far ahead they start and whether they can refill mid-break.
- Venue rules. Many hotels and conference centers require their own catering and price coffee by the gallon. Use the gallon figures to check the quote.
- Other drinks. Water, iced tea, juice and soft drinks aren't counted here. Use the event drink calculator for a bar.
- Specialty drinks. Espresso carts and baristas serve far fewer cups an hour than self-serve urns, so plan lines and staffing with the vendor.
- Food. Pastries, snacks and lunch are separate; use the event food calculator.
Estimate only, from the figures you entered. Not a quote. Last reviewed November 2026.
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Frequently asked questions
How much coffee do I need for 100 people?
About 16 gallons for a full day with three coffee services, at this calculator's defaults: 65 of 100 people drink coffee, 1.5 cups each at morning arrival and 1 cup at each of two breaks, 8 oz cups and a 10% buffer. That is 252 cups (108 at arrival, 72 per break) and about 7.3 lb of ground coffee. For a single morning service it is 108 cups, about 6.8 gallons.
How many coffee urns do I need for 200 people?
At this calculator's defaults, 5 urns rated at 100 cups at morning arrival: 3 for regular coffee (172 cups, about 10.8 gallons), 1 for decaf (43 cups) and 1 for hot water (50 cups). Many urn makers count 5 oz cups, so a 100-cup urn holds about 3.9 gallons, roughly 62 cups of 8 oz. Each later break needs 4 urns if you refill between services.
How much coffee per person should I plan at a conference?
Plan on about 3.5 cups of coffee per coffee drinker over a day with a morning arrival and two breaks (1.5 + 1 + 1), plus a buffer. Spread across everyone who attends, that is about 2.5 cups, or 20 oz, per attendee per day at this calculator's defaults. These are planning assumptions; adjust them for your crowd and timing.
How much ground coffee do I need per gallon?
This calculator uses 55 g of ground coffee per liter of brewed coffee, about 0.46 lb per gallon. So 1 lb of ground coffee makes about 2.2 gallons, or 35 cups of 8 oz. Brew stronger or weaker to taste, and use your roaster's or caterer's ratio if they give you one.
Can I plan coffee stations on my floor plan in Map D?
Yes, for the layout, not the catering. In Map D's floor plan editor you can mark coffee stations and break areas with named areas and furniture tables on a floor plan drawn to scale, so lines don't block registration, session doors or exhibitor booths. Map D doesn't order coffee or manage catering. You can build one event's floor plan free; publishing and sharing it needs a paid plan, with Basic starting at $3,499.
Sources
- NIST: approximate conversions from US customary measures to metric (gallons, fluid ounces, ounces) · checked 2026-11-10
- Map D help center: the free plan and how to upgrade · checked 2026-11-10
- Map D pricing · checked 2026-09-18