Choosing the right coffee-to-water ratio is a key step in making great coffee. How much coffee you use for a given amount of water affects strength, balance of flavour and extraction. The right ratio lets you draw out the coffee’s full flavour potential while avoiding unpleasant bitterness or excessive acidity. Here are practical tips and details for different brewing methods.
Recommended coffee-to-water ratios
Specialist organisations such as the Specialty Coffee Association (SCA) recommend using 55 g of coffee per 1 litre of water, which corresponds to a ratio of 1:18 (1 part coffee to 18 parts water). You can adjust the ratio to your preferences:
-
Stronger brew: a ratio of 1:15, ideal if you like an intense flavour.
-
Lighter brew: a ratio of 1:20, better suited to subtle, light flavour profiles.
Sticking to the right ratio not only gives a better flavour but also saves coffee and water, especially when you brew every day.
Brewing methods and ratios
Every brewing method needs its own ratio. Here are the details for the most popular ones:
French press
-
Recommended ratio: 1:15 (about 30 g of coffee to 450 ml of water).
-
Coarse grind, brew time: 4-5 minutes.
-
Using more water can make the brew too watery, and too little coffee can weaken its character. After brewing, press the plunger down gently to avoid making the coffee too cloudy.
Pour-over (e.g. Chemex, V60)
-
Recommended ratio: 1:16-1:17 (30 g of coffee to 500 ml of water).
-
Medium grind.
-
Pouring gradually with water at 90-96°C helps even extraction. Pour-over lets you control the brewing process better, so you can get a rich aromatic profile.
Espresso
-
INEI standard (Istituto Nazionale Espresso Italiano): 7 g of coffee to 25 ml of water.
-
A tighter ratio, e.g. 1:2, used in modern espresso gives a more intense brew.
-
The short brew time (25-30 seconds) requires precise measuring of coffee and water. In espresso, grind size and even tamping of the coffee in the portafilter play a particularly important role.
AeroPress
-
Recommended ratio: 1:15 (about 17 g of coffee to 250 ml of water).
-
You can experiment with the ratio to get different flavour profiles, e.g. more concentrated or lighter brews. Using the right extraction time (1-2 minutes) also matters, as it affects the clarity of flavour.
Cold brew
-
Recommended ratio: 1:6 (100 g of coffee to 600 ml of water).
-
Coarse grind, steeping time: 12-24 hours in the fridge.
-
Before serving, the concentrate can be diluted 1:1 with water or milk. Cold brew has a particularly smooth flavour, and its lower acidity makes it ideal for hot days.
Factors that affect the ratio
The coffee-to-water ratio can be adjusted depending on:
-
Roast level: a light roast may need more coffee to bring out its delicate notes. A dark roast is more intense and needs less for a balanced flavour.
-
Grind size: a finer grind increases the contact area between coffee and water, which can intensify the flavour. Avoid grinding too fine, though, as that can lead to excessive bitterness.
-
Taste preferences: experimenting with the ratio lets you adjust the strength of the brew to your own taste. Start with the standard ratio, then adjust it by trial and error.
How to measure coffee and water
A kitchen scale is the best way to measure accurately. A measuring jug and a water thermometer are also useful. One tablespoon of ground coffee weighs about 5-7 g, which can help if you do not have a scale. Measuring precisely helps you avoid accidental mistakes that could affect the quality of the brew.
Common ratio mistakes
-
Too much coffee: the brew can be bitter and unpleasant. Too much coffee leads to the extraction of compounds that dominate the natural sweetness.
-
Too little coffee: the coffee will be watery and dominated by sour notes. Too small a dose can also leave the flavour flat.
-
The wrong water temperature: too low leads to under-extraction, too high to a bitter taste. The right temperature is key to a balanced brew.
Final tips
The coffee-to-water ratio is the foundation of brewing. Use the SCA recommendations as a starting point, then adjust them to your brewing method and your own preferences. Precise measuring, control of brew time and water temperature will help you make a brew that tastes great. Every cup of coffee can be a chance to discover new flavours and aromas.
