Brewing Coffee for a Crowd: How to Scale Your Ratio

Friends coming over for brunch, a long lunch at the office, or a family Christmas morning with eight sleepy coffee drinkers? Brewing for a crowd is where most home recipes fall over. Double a single cup recipe by eye and you usually end up with something too weak, too bitter or stone cold by the time the last person gets a mug. The fix is simple: weigh everything and keep the ratio fixed while the batch gets bigger.

Start with the ratio, not the scoop

For filter style coffee, a ratio of 1:16 (one gram of coffee to 16 grams of water) is a reliable starting point. That works out to roughly 60 grams of coffee per litre of water. If your group likes it stronger, move towards 1:15. If they prefer something lighter, try 1:17. Whatever you choose, the ratio stays the same no matter how many cups you are making, which is exactly why weighing beats scoops and guesswork.

Here is how 1:16 scales for a group:

• 4 mugs (about 1 litre of water): 63 g of coffee
• 8 mugs (about 2 litres): 125 g of coffee
• 12 mugs (about 3 litres): 188 g of coffee

Rather than doing the maths on the back of a napkin, plug your batch size into our pour over and filter coffee ratio calculator. Enter the water you want to brew and it will give you the coffee dose, grind size and water temperature in one go.

Choosing a method for a crowd

Not every brewer suits a big batch. These are the easiest options at home:

• Batch filter brewer: the simplest choice for large groups. Load the basket, add the water and let it run. Most will happily brew a litre or more at a time.
• Large pour over: great for four to six people. Use a bigger dripper and pour in slow, even stages so the larger coffee bed extracts evenly.
• French press: a large plunger is forgiving and needs no paper filters. Use a coarser grind, a slightly stronger ratio of around 1:15, and steep for about four minutes before plunging.
• Several small brews: if you only own a single cup dripper or AeroPress, brew in rounds into a warmed thermal jug. It takes a little longer but the result is just as good.

Step by step: a big batch of filter coffee

1. Weigh your coffee using your chosen ratio. For eight mugs at 1:16, that is about 125 g.
2. Grind just before brewing. For larger batches, go a touch coarser than you would for a single cup. A deeper bed of coffee slows the flow of water, so a slightly coarser grind keeps the brew time in check and avoids bitterness.
3. Heat your water to between 93 and 96°C. If you do not have a thermometer, let a boiled kettle rest for about 30 seconds.
4. Bloom the coffee. Pour roughly twice the weight of the coffee in water over the grounds and wait 30 to 45 seconds. This lets trapped gas escape so the rest of the water extracts evenly. With a bigger bed, give it a gentle stir to make sure everything is wet.
5. Brew the rest in steady pours or let your batch brewer do the work.
6. Serve or decant straight away into a preheated thermal carafe.

Keeping coffee hot without ruining it

The biggest mistake with large batches is leaving the jug sitting on a hotplate. Constant heat keeps cooking the coffee and quickly turns it flat and bitter. A good thermal carafe or vacuum flask, warmed with hot water before you fill it, will hold your coffee at a pleasant temperature far better. Even so, coffee tastes best when it is fresh, so aim to serve it within the first half hour and brew a second batch if the crowd is still going.

Small tweaks that make a big difference

• Use freshly roasted beans. Coffee at its best within a few weeks of roasting gives a fuller, sweeter cup, which matters more when it is shared.
• Taste and adjust. If the batch tastes thin or sour, grind a little finer or use a stronger ratio next time. If it tastes harsh or bitter, grind coarser.
• Offer milk on the side. Let guests add their own so you can keep one batch suiting everyone.
• Write down what worked. Once you find your favourite crowd recipe, you can repeat it every time.

Hosting at home adds up

Brewing a big batch is also far kinder on the wallet than a round of takeaway coffees for the whole group. If you have ever wondered what your regular cafe runs really cost, our coffee savings calculator compares your cafe spend with brewing at home and shows what you could save over a year.

Ready to brew for everyone?

Before your next get together, use the Beanery brew guide and ratio calculator to scale your recipe to any number of cups, then head to the home versus cafe savings calculator to see how much your home brewing is putting back in your pocket.