Coffee for a Crowd Calculator

How much coffee do you really need for a crowd?

The classic rule of thumb is about 1.5 cups of coffee per person for an average gathering, brewed at roughly 1.5 tablespoons of grounds per 6 oz cup. That standard 6 oz "cup" is the coffee-industry measure, not your 12 oz travel mug, so the numbers here describe brewer output rather than the size of any single serving. This calculator multiplies your headcount by those constants and converts the totals into tablespoons, cups, and grams of grounds plus gallons of water, so you can shop and brew without guessing.

Grounds, weight, and water at a glance

We treat 16 tablespoons as one cup of grounds and about 5 grams as one tablespoon, then figure 6 oz of water for every cup of coffee and 128 oz to the gallon. Bump the strength selector to "Strong" for early mornings or a bold roast, or ease to "Mild" for an all-day office urn. These are estimates, not professional advice — beans, grind, and brewer all shift the real yield, so taste and adjust.

How to use it

1. Enter the number of people you are serving.
2. Set cups per person (1.5 is a safe party default; drop it for a short event).
3. Pick a strength to match your crowd and roast.
4. Read the results row for grounds and water, then round up a little for refills.

FAQ

How many people does one pound of coffee serve?

A pound is about 454 g, or roughly 90 tablespoons — enough for around 60 regular 6 oz cups, so about 40 guests at 1.5 cups each.

My mug holds 12 oz. Does that change things?

Yes. Two 6 oz cups fill one 12 oz mug, so cut your cups-per-person number in half if you are thinking in big mugs.

How much water should I add?

Use the gallons figure — it assumes 6 oz of water per cup. A 12-cup drip pot makes about 60 oz, so plan pots or urn size accordingly.

Should I make extra?

Rounding up 10–15% covers refills and late arrivals, especially for morning events where people drink more.