Key takeaways
- Plan about 2 cups of coffee per guest — guests × cups/person = total cups.
- Convert to volume: total cups × cup size ÷ 128 = gallons (a gallon holds 16 eight-ounce cups).
- One pound of ground coffee brews about 32 (8 oz) cups, so cups ÷ 32 = pounds of grounds.
- 50 guests × 2 cups ≈ 100 cups → 6.3 gallons, 3.5 lb grounds, about 9 twelve-cup pots.
How to calculate coffee for a crowd
Sizing coffee for an event is two steps: estimate the total number of cups, then convert that into the gallons you'll serve and the pounds of grounds you'll buy. The standard host's rule is about two cups per guest across a morning or all-day gathering, with the brew ratio holding near two tablespoons of grounds per six-ounce cup.
Cup size matters: an 8 oz cup is the planning standard, but if you're serving 12 oz mugs the gallons climb fast. Set it to match the cups you'll actually pour.
Worked example: 50 guests, 2 cups each
Total = 50 × 2 = 100 cups. At 8 oz each that's 800 oz, and 800 ÷ 128 ≈ 6.3 gallons. For grounds, 100 ÷ 32 ≈ 3.1, rounded up to 3.5 lb of ground coffee. Brewing in 12-cup carafes, 100 ÷ 12 ≈ 9 pots over the course of the event.
Coffee for common headcounts
| Guests (2 cups each) | Cups | Gallons | Grounds (lb) |
|---|---|---|---|
| 25 guests | 50 | 3.1 | 2.0 |
| 50 guests | 100 | 6.3 | 3.5 |
| 100 guests | 200 | 12.5 | 6.5 |
| 200 guests | 400 | 25.0 | 12.5 |
Buy a little extra — and plan the rest
Round the grounds up and keep an extra bag on hand; people drink more in cold weather and early mornings. If coffee is just one station, sort out the cold bar with the drinks for a party calculator, and match the menu with the food for a party calculator so nothing runs short.
Frequently asked questions
How much coffee do I need for a crowd?
About 2 cups per guest. 50 guests = 100 cups ≈ 6.3 gallons; at 32 cups per pound that's about 3.5 lb of grounds.
How much ground coffee per cup?
Roughly 2 tablespoons per 6 oz cup. In bulk, 1 lb of grounds brews about 32 (8 oz) cups — the rule this tool uses.
How many cups of coffee are in a gallon?
A gallon is 128 oz, so 16 (8 oz) cups. Divide total ounces by 128 for gallons — 800 oz = 6.3 gallons.
How do I split regular and decaf?
About one-third decaf for evening or all-day events. For 100 cups, brew roughly 70 regular and 30 decaf.
How far ahead can I brew?
Brewed coffee holds 30–45 minutes on a warmer. Use insulated airpots or urns and brew in batches so each pot is fresh.
How many cups in a coffee pot?
A standard carafe is rated ~12 (5 oz) cups. This tool counts 8 oz cups at 12 per pot — 100 cups ≈ 9 pots.
Brew ratios follow the standard ~1:16 coffee-to-water guideline (about 2 tablespoons of grounds per 6 oz cup) — see the SCA brewing guidance. Cups-per-pound and pot yields are standard hosting estimates.
Last reviewed June 2026