How much coffee do you need for a crowd? Litres, grams and batches

How much coffee do you need for a crowd? Plan by cups poured, not guests invited: about 55 grams of ground coffee per litre of water, plus roughly a tenth extra because the grounds soak water up.

Use the calculator to turn a guest list, event length and cup size into litres, grams and brew rounds, then keep the coffee hot in a pre-warmed jug rather than on a hot plate.