Coffee-to-water ratio: how much coffee per cup

The coffee-to-water ratio is the one number that decides how strong your coffee tastes. Get it right and the same beans taste sweeter, rounder and more like themselves. Get it wrong and no grinder, kettle or filter will save the cup. Here's how to read a ratio, which one to use for every brewer, and a calculator that does the math for you.

What a coffee-to-water ratio means

A ratio of 1:16 means 1 part coffee to 16 parts water, measured by weight. Because 1 milliliter of water weighs 1 gram, you can read the water side in grams or milliliters, whichever your scale or kettle shows.

The lower the second number, the stronger the coffee:

• 1:15 is strong and full-bodied.
• 1:16 is the balanced middle most people like.
• 1:17 to 1:18 is lighter, cleaner and more tea-like.

There are two well-known reference points. The National Coffee Association's "golden ratio" is 1 to 2 tablespoons of ground coffee for every 6 ounces of water. The Specialty Coffee Association's Golden Cup standard is about 55 grams of coffee per liter of water, roughly 1:18. Most cafés brew filter coffee somewhere between 1:15 and 1:17.

Why weigh coffee instead of scooping it

A scoop measures volume, and coffee doesn't weigh the same from bag to bag. Dark roast beans lose more water in the roaster, so they're lighter and puffier: a tablespoon of dark roast can weigh noticeably less than a tablespoon of light roast. Grind size changes it too. A kitchen scale that reads to 0.1 g costs less than a few bags of coffee and takes the guesswork out of every cup. Our guide to light roast vs dark roast explains why the beans differ.

Coffee ratio calculator

Pick your brew method, enter how much water you're using and adjust the strength. The calculator gives you the coffee in grams and in level tablespoons.

Coffee to water ratio chart by brew method

Every brewer extracts coffee differently, so each has its own sweet spot. Start with the ratio in the "Start at" line, then adjust one step at a time.

Method	Ratio	StrongerLighter	Grind	Water	Time
Drip machine	1:15–1:18Start at 1:16	StrongerLighter	Medium	195–205°F91–96°C	5–6 min
Pour-over	1:15–1:17Start at 1:16	StrongerLighter	Medium-fine	200–205°F93–96°C	3–4 min
French press	1:12–1:16Start at 1:15	StrongerLighter	Coarse	200°F93°C	4 min
Moka pot	1:7–1:10Start at 1:9	StrongerLighter	Fine to medium	Hot from the kettle	4–5 min
EspressoCoffee in to espresso out	1:1.5–1:2.5Start at 1:2	StrongerLighter	Fine	195–203°F91–95°C	25–30 s
Cold brew1:4–1:5 is a concentrate; dilute it 1:1	1:4–1:8Start at 1:8	StrongerLighter	Extra coarse	Cold	12–18 h

Drip coffee maker

Use 1:15 to 1:18 with a medium grind, and start at 1:16. A full 12-cup machine holds about 60 fl oz (1.8 liters), because a coffee-maker "cup" is only 5 to 6 ounces, so plan on roughly 100 to 110 g of coffee for a full pot. If the pot tastes thin, use more coffee rather than a finer grind, which can clog the basket.

Pour-over (V60, Kalita, Chemex)

Start at 1:16: 22 g of medium-fine coffee to 350 g of water at 200 to 205°F (93 to 96°C). Pour about twice the coffee's weight in water first and let it bloom for 30 to 45 seconds, then pour the rest in slow circles. The whole brew should take 3 to 4 minutes.

French press

Start at 1:15: 30 g of coarse coffee to 450 g of water. Steep for 4 minutes, then press slowly. French press can take a stronger ratio, down to 1:12, because its metal filter lets more oils and body through.

Moka pot

A moka pot sets its own ratio, roughly 1:7 to 1:10. Fill the basket level without tamping, about 15 to 17 g for a 3-cup pot, and fill the bottom chamber with hot water to just below the valve. Take it off the heat as soon as it starts to sputter.

Espresso

Espresso measures coffee in against espresso out. The classic is 1:2: 18 g of finely ground coffee makes 36 g of espresso in 25 to 30 seconds. A ristretto runs closer to 1:1.5 and a lungo to 1:3.

Cold brew

For a concentrate, steep at 1:4 to 1:5 and dilute it about 1:1 with water or milk. For cold brew you drink straight, steep at about 1:8. Use an extra-coarse grind, steep for 12 to 18 hours in the fridge, then strain.

How much coffee per cup

Here's the 1:16 ratio worked out for common cup sizes. Tablespoons assume about 5 g per level tablespoon of ground coffee. A standard coffee scoop is 2 tablespoons, about 10 g.

How to dial in your ratio

The ratio sets strength. Grind size and brew time set extraction: how much flavor the water pulls out of the coffee. Change one thing at a time:

• Too strong, heavy or harsh? Add water: move from 1:15 to 1:16 or 1:17.
• Weak or watery? Use more coffee: move from 1:17 toward 1:15.
• Sour, sharp or thin, even at a good strength? It's under-extracted. Grind a little finer or brew a little hotter.
• Bitter, dry or hollow? It's over-extracted. Grind a little coarser or shorten the brew.

Roast level matters too. Light roasts are denser and harder to extract, so they often taste best a little stronger, around 1:15, with water just off the boil. Dark roasts extract easily and can turn bitter, so try 1:16 to 1:17 with water around 195°F (90°C). Our guide to light roast vs dark roast covers the differences in detail.

Frequently asked questions

What is the golden ratio for coffee?

Most brewing guides call 1:16 to 1:18 the golden ratio: 1 gram of coffee for every 16 to 18 grams of water. The National Coffee Association suggests 1 to 2 tablespoons of ground coffee per 6 ounces of water, and the Specialty Coffee Association's Golden Cup standard is about 55 grams of coffee per liter, roughly 1:18.

How many tablespoons of coffee per cup?

For an 8 oz cup, use about 3 level tablespoons (15 g) of ground coffee. A 6 oz coffee-maker cup takes about 2 tablespoons (11 g), and a 12 oz mug about 4½ tablespoons (22 g). Weighing is more accurate, because a tablespoon of ground coffee can weigh anywhere from about 4 to 7 grams.

How much coffee do I need for 12 cups?

A 12-cup coffee maker holds about 60 fl oz (1.8 liters), because its cups are 5 ounces. At 1:16 that is about 110 g of coffee, roughly 22 level tablespoons or 11 scoops. Use about 100 g for a lighter pot.

What is the coffee-to-water ratio for French press?

Start at 1:15, for example 30 g of coarsely ground coffee to 450 g of water, and steep for 4 minutes. For a bolder, heavier cup, go as strong as 1:12.

What is the ratio for cold brew?

Brew a concentrate at 1:4 to 1:5 and dilute it about 1:1 with water or milk, or brew ready-to-drink cold brew at about 1:8. Steep extra-coarse grounds in the fridge for 12 to 18 hours, then strain.

Should I use a different ratio for light and dark roasts?

Stay in the same range, but light roasts often taste best a little stronger, around 1:15, with water just off the boil. Dark roasts extract faster and are smoother at 1:16 to 1:17 with water around 195°F (90°C).

Written by the Brave Pilots roasting crew at Brave Pilots Coffee. We roast every Friday and ship the same day.