How to Make Chemex Coffee (Ratio Included)

Posted in  Coffee Brewing  on  March 23, 2021 by  Urban Bean Coffee Team

If you are wondering how to make Chemex coffee, then you are in the right place.

The Chemex a glass coffeemaker used to brew pour-over coffee. Thanks to its dense filter, the coffee will be light and clean, but also rather strong due to prolonged contact with water.

Chemex, like any filter brewing method, is good at helping to reveal floral, berry and fruit aromas.

Check out this video to learn more about the Chemex coffee:

Chemex Brewing Guide

We have prepared step-by-step instructions for making Chemex coffee and share them below. Let's start by grinding.



The grind for Chemex coffee is a medium-coarse grind, slightly finer than the coarse ground coffee for a French press. It should look like sea salt. You can always adjust the grind size to brew the best coffee for your tastes.


Coffee to Water Ratio for Chemex

The optimal coffee dosage for a standard 2-cup Chemex is 1.11 oz (31.53 grams).

The ratio of coffee weight to finished coffee is always the same—1:17, which is 2.07 oz (58.8 grams) of coffee beans per 33.8 fl oz (1 liter) of water. To determine the dosage for each specific case, you just need to calculate the proportions, but the grind size may have to be changed slightly. It is worth trying different options and focusing on how long brewing takes.

Below we provide the water infusion calculations based on regular and strong coffee ratios (1:17 and 1:11).

Chemex Pour-Over Coffee to Water Ratio


Prepare Water

The optimum temperature for making Chemex coffee is 200-203°F (93-95°C). To achieve this temperature, you need to either bring the water to a boil and then cool it for a minute, or use a good water thermometer.

The temperature of the water significantly affects the taste, and the choice of temperature also depends on the particular type of coffee. We can't give any universal recommendations, so we recommend experimenting: a difference of one degree can give coffee brightness, sweetness, and balance, or it can leave an unpleasant aftertaste.


Placing Coffee In a Paper Filter

We recommend that you pour 4-6 fl oz (100-200 ml) of hot water through the filter to completely dampen the filter (and then pour out the excess water) even before adding ground coffee beans to a paper filter. This is to remove any possible paper taste.

After that, you need to pour coffee into the filter and shake the Chemex lightly so that the coffee is smoothed.


Pre-wetting (blooming)

The first stage of brewing is pre-wetting. It helps to improve the taste of coffee and make the results more consistent, especially if the coffee was roasted less than a month ago. This step allows excess gases to escape from the coffee so that during extraction they do not affect the result.

First, put the Chemex coffee maker on the scale and zero it, then start the timer and gently moisten the coffee with a small amount of water—about 2.5 fl oz (75 grams) of water, and then wait 30 seconds until all the water is absorbed into the coffee. When this happens, you need to immediately start brewing.

The volume of water for pre-wetting is usually calculated at three times the weight of the coffee itself. That is, if you use 1 oz (28.3 grams) of coffee grounds, then the weight of the pre-wetting water will need to be 3 oz (90 ml).


Infusion of Water

Water infusion is the most critical part of the whole process since you need to simultaneously monitor the time and weight of the water.

There are several methods of infusion: interval, gradual, and one-time.

The one-time method is when water is poured in in a circular motion all at once, the interval method is when water is poured in in certain portions, and the gradual method is a compromise between a one-time and an interval method.

After pre-wetting, you need to gently, start pouring water into the ground coffee beans in a circular motion in a thin stream, starting from the center and moving closer to the edges.


The total brewing time, including pre-wetting, should be 3-3.5 minutes, during which time all the water in the Chemex filter should pass through the ground coffee into the Chemex. However, this time will change if you make more or less coffee.

At the very end, you need to throw out the used filter and grounds, shake up the drink for oxygenation, and enjoy the taste!

About the Author

Urban Bean Coffee Team

Coffee is part of the lives of everyone on the Urban Bean Coffee team. We are a group of professional baristas, coffee bean roasters, and coffee machine repairers. Coffee has connected us, and together we strive to provide the best information to our readers. Our responsibility is to provide advice on any and all coffee-related issues. And we know that to do this we must be experts in this field. The coffee consumption culture has changed dramatically over several centuries. New brewing methods, bean quality control methods, roasting methods, and much more have appeared. We are sure that coffee will change further, and we want to be involved in changing it for the better.

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