Coffee to water ratio: how much coffee per cup, by method

Brew ratio is the weight of coffee grounds set against the weight of water, written as coffee to water: 1:16 means one gram of coffee for every sixteen grams of water. It is the number that decides how strong the cup tastes, and it is the one variable you can change in three seconds without touching your grinder.

What the ratio does not decide is extraction, meaning how much of the coffee dissolves. That comes from grind size, water temperature, brew time, and the method itself. Keep those steady and strength follows the brew ratio almost by itself. Mix the two ideas up and you end up chasing bitterness with a measuring spoon, which never works.

How do brew ratios work?

A brew ratio is expressed as coffee : water by weight in grams. Multiply your coffee dose by the second number and you have the water weight to pour.

What lands in the cup weighs a little less than the water you poured, because wet grounds hold some of it back. Weigh the water going in, not the coffee coming out, and the arithmetic stays simple.

The other common notation is grams per litre: 60 g/L works out to a ratio of 1:16.7. Same statement, different numbers. Published brewing standards use it, and they sit at the weaker end of the popular range. The American figure is 55 g of coffee per litre and the Norwegian one 63 g/L, roughly 1:18 and 1:16, which comes to 14 to 16 grams for a 240 ml cup.

How much coffee per cup?

This is the question almost everyone arrives with, and the honest answer has two halves: the number is easy, the spoon is not.

By weight, a 240 ml cup at 1:16 takes 15 g of coffee. Scale from there.

By volume, the reference point is the National Coffee Association's Golden Ratio: one to two tablespoons of ground coffee for every 6 ounces of water. Notice how wide that is. One tablespoon or two is a factor of two, and the NCA leaves it open on purpose, because a tablespoon of coffee is not a fixed weight.

Grind size, roast level, and bean density all change how much coffee fits in the same spoon. A dark, finely ground coffee packs more grams into a tablespoon than a light, coarsely ground one, so the same "two level spoons" recipe can land you at very different strengths from bag to bag. That is the whole case for a kitchen scale, and the reason every recipe you will read from a roaster is written in grams.

One more trap with drip machines: the "cups" marked on the carafe are the manufacturer's graduation, not the 240 ml cup in the table above and not an 8 oz measuring cup either. If your machine's 10-cup line fills 1.25 litres, brew for 1.25 litres. Fill it once with water, weigh what comes out, and write the number on a sticky note.

What is the coffee-to-water ratio for each brew method?

The NCA puts the French press as wide as 1:10 to 1:16 with 93 ± 3 °C water and a four-minute steep, and gives a pour-over two to four minutes of contact. The narrower starting points above are where most specialty recipes actually sit. Immersion methods extract more than percolation at the same ratio, so the press tastes stronger for the same numbers on the scale.

Two methods do not take a ratio at all. A moka pot fills its basket level and its boiler to the valve, so the pot decides for you; the numbers above are what a classic moka measures out to, not a dial you turn. Turkish coffee works the same way, portioned by the cezve. Trying to "adjust the ratio" on either one usually means an underfilled basket and a sour, uneven brew.

How does brew ratio affect flavour?

Strength and extraction are two different measurements, and the ratio only moves one of them.

Strength is how much dissolved coffee is in the liquid, measured as total dissolved solids. Typical brewed coffee runs 1.15% to 1.35% TDS in North America, a touch higher in the Nordics. Brew ratio is the main lever here.

Extraction yield is what percentage of the dry grounds dissolved. 18% to 22% is the desirable band: below 18% the cup reads sour and thin because acids come out first, above 22% it turns bitter. Grind, temperature, and time move this number. Ratio barely touches it.

So a wide ratio gives you a weak cup, not an under-extracted one. Adding water after brewing changes strength and leaves yield exactly where it was. That is the entire principle behind an Americano. If your coffee is sour, reach for a finer grind or hotter water. If it is bitter, go coarser or shorter. Reach for the ratio when the cup tastes right but too faint or too heavy.

How do you find your ideal brew ratio?

Fine-tuning beyond ratio

Once the ratio is settled, these are the levers that change extraction:

Change one at a time. Two changes at once and you have learned nothing, which is a slower way to get to a good cup than it looks.

Why weigh coffee instead of scooping?

A scoop is not useless. If you buy the same coffee every week and grind it the same way, your scoop is calibrated for that coffee and it will serve you fine. It stops working the moment you switch beans, switch roast level, or open a bag that has been sitting around. A scale that reads to 1 g costs less than a bag of specialty coffee and removes the variable permanently.

If you would rather not weigh water either, weigh the coffee and pour water to a mark you have measured once. Half the benefit for a tenth of the fuss.

What is the brew ratio for espresso?

Espresso counts differently. The ratio is dose, the dry coffee in the portafilter, against yield, the liquid in the cup. The NCA puts the standard at 1 gram of dry coffee to 2 grams of brewed espresso in 20 to 30 seconds.

Weigh the shot, not the volume. Crema makes a 30 g shot look like 45 ml, and it collapses while you are deciding.

What is the brew ratio for cold brew?

Cold water pulls less out of the grounds than hot water, so cold brew compensates with a tighter ratio and a long steep. Published concentrate recipes run anywhere from about 1:4 to 1:10, and the spread is not disagreement so much as a question of how much you plan to dilute afterwards. The NCA's figure is 1 gram of coffee to 4 or 5 grams of water over roughly 12 hours, which assumes you cut it heavily.

Whichever end you start from, once the dilution is done the glass lands near filter strength, around 1:14 to 1:16. That is the point of the exercise. Drinking a concentrate neat is not dangerous, only unpleasant.

How do you scale a brew ratio?

Scaling a brew ratio is plain multiplication, and this is exactly why ratio notation exists. If a single cup uses 15 g at 1:16, four cups is 60 g and 960 g of water. Bakers do the same thing with baker's percentage: fix the proportions, and batch size stops being a recipe problem.

Extraction efficiency does drift a little with batch size. A one-litre Chemex has a deeper coffee bed and a slower drawdown than a single cup, so if the big batch tastes different, adjust the grind rather than the ratio.

What are the most common brew ratio mistakes?

What are the best brew ratio tips?

• Write the ratio down the day you brew a cup you love. You will not remember it on Thursday.
• Lighter roasts are usually less dense, so they often want a slightly tighter ratio than a dark roast measured the same way
• Water matters nearly as much as ratio. Filtered water with some mineral content brews better than distilled or heavily chlorinated water
• Rinse your paper filter before brewing, but keep that water out of your ratio
• When you share a coffee recipe, lead with the ratio. It is the one number that survives the trip to someone else's kitchen

Brew ratios in Fond

Fond is a recipe manager, and a brew recipe is a recipe: dose, water, grind, time, and the note you wrote about what it tasted like. Save it once and scaling from one cup to a full carafe is arithmetic Fond already does, the same way it does for a doubled dinner.

The Coffee Lab, a dedicated workshop covering brew ratios, extraction timers, a grind reference and a bean journal, is announced but has not shipped yet. The Pizza Workshop is the one that is live today.