The Perfect Amount of Coffee for Your 8 Cup Chemex

Matty Victor

Are you in need of that perfect morning pick-me-up? Look no further than the 8 cup Chemex, a beloved brewer that promises a smooth and flavorful cup of joe. But wait, how much coffee do you actually need to achieve coffee bliss? Fear not, coffee enthusiasts, as we delve into the magic ratio for this popular brewing method. Whether you’re a seasoned coffee aficionado or a curious newbie, we’ve got you covered with all the details to ensure you wake up to a perfect cup of coffee every day. So, grab your Chemex and let’s embark on a caffeinated journey!


Welcome to our comprehensive guide on how much coffee to use for an 8 cup Chemex! If you are a coffee lover, you know the importance of obtaining the perfect brewing ratio. The Chemex is a popular coffee maker known for its elegant design and ability to produce a smooth and clean cup of coffee. However, getting the right amount of coffee for your Chemex can be a bit tricky, especially if you are new to brewing with it. In this article, we will discuss the ideal coffee-to-water ratio, provide step-by-step instructions, and share some expert tips to help you achieve coffee excellence with your 8 cup Chemex.

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What is a Chemex?

A Chemex is a pour-over coffee maker invented by Peter Schlumbohm in 1941. Its iconic hourglass shape, made from non-porous glass, allows coffee to be brewed with minimal bitterness and sediment. The Chemex uses specially designed filters that are thicker than regular filters, which traps more oils and produces a cleaner cup of coffee. The use of a Chemex requires a specific brewing technique, including the right amount of coffee and water.

Why is the Right Amount of Coffee Important?

The amount of coffee you use directly affects the taste and strength of your brew. Using too little coffee can result in a weak and under-extracted cup, while using too much coffee can lead to an overpowering and bitter taste. Achieving the perfect balance is crucial to extracting the full flavor potential from your coffee beans.

How to Determine the Ideal Coffee-to-Water Ratio

When brewing with an 8 cup Chemex, the general rule of thumb is to use a ratio of 1:15, which means 1 part coffee to 15 parts water. This ratio provides a good starting point, but you can adjust it based on your personal preference. Here is a step-by-step guide:

Step 1: Weigh Your Water

Begin by weighing the desired amount of water you want to brew. For an 8 cup Chemex, you will need approximately 1200 grams of water. Remember, Chemex cups are slightly smaller than standard cups, so keep that in mind while measuring.

Step 2: Calculate the Coffee Amount

To determine the amount of coffee to use, divide the weight of the water by the desired coffee-to-water ratio. For example, if you prefer a 1:15 ratio, divide 1200 grams by 15. The result is 80 grams of coffee.

Step 3: Grind Your Coffee

Grind the coffee beans to a medium-coarse consistency. This grind size works best for the Chemex and allows for optimal extraction.

Step 4: Preheat the Chemex and Rinse the Filter

Preheat your Chemex by rinsing it with hot water. This helps to maintain the brewing temperature. Place the Chemex filter in the brewer and rinse it with hot water to remove any paper taste.

Step 5: Add Coffee and Start Brewing

Once the Chemex is prepped, add the ground coffee into the filter. Start pouring hot water (just off the boil) over the coffee in a slow and steady circular motion. Allow the coffee to bloom for around 30 seconds, then continue pouring the rest of the water in a controlled manner.

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Step 6: Wait and Serve

Once you have poured all the water, let the coffee fully drip through the filter until there is no more liquid coming out. Your coffee is now ready to be served and enjoyed!

Tips for Brewing the Perfect Cup with a Chemex

Here are some additional tips to help you achieve coffee excellence with your 8 cup Chemex:

Tip 1: Use Freshly Roasted Coffee Beans

Always prefer freshly roasted coffee beans for the best flavor. Coffee beans start to lose their freshness and flavor after a certain period, so try to buy beans with a recent roast date.

Tip 2: Experiment with Different Coffee-to-Water Ratios

While the standard ratio of 1:15 is a good starting point, don’t be afraid to experiment and adjust the ratio to suit your taste preferences. You may find that you prefer a stronger or milder brew.

Tip 3: Control Water Temperature

The ideal water temperature for brewing coffee with a Chemex is between 195°F and 205°F (90°C to 96°C). Use a kettle with a built-in thermometer or an electric kettle with precise temperature control to ensure your water is within this range.

Tip 4: Pour Slowly and Steadily

When pouring the hot water over the coffee grounds, make sure to do it slowly and steadily. Pouring too quickly or with too much force can result in uneven extraction and a less flavorful cup of coffee.

Tip 5: Clean Your Chemex Regularly

To maintain the quality and taste of your brews, clean your Chemex after each use. Wash it with warm water and mild soap, making sure to remove any coffee residue or oils that can accumulate over time.

Drip Coffee Makers Chemex
Requires paper filters Special thicker filters designed to absorb more oils
Standard shape Iconic hourglass shape
Can produce a bitter cup if not brewed correctly Known for producing a smooth and clean cup

Important Note: The Chemex brewing process requires a slow and patient approach. Take your time in pouring the water, allowing it to extract the flavors gently. Rushing the process may result in an uneven and subpar cup of coffee.


In conclusion, brewing coffee with an 8 cup Chemex can be a delightful experience when using the right amount of coffee and water. By following our guide, you can achieve a balanced and flavorful cup of coffee every time. Remember to experiment with different ratios and techniques to find what works best for your taste preferences. Whether you’re a coffee aficionado or a brewing novice, the Chemex offers a unique brewing experience that can elevate your coffee drinking pleasure. Enjoy the process, savor each sip, and cheers to your perfect cup of coffee with your 8 cup Chemex!

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FAQs (Frequently Asked Questions)

Question 1: How can I determine the right coffee-to-water ratio for my 8-cup Chemex?

Answer: Achieving the perfect coffee-to-water ratio is crucial for a delicious cup of coffee. It is generally recommended to use a ratio of 1:15, which means for every 1g of coffee, you should use 15g of water. In the case of an 8-cup Chemex, which holds 40 ounces or approximately 1200ml of water, you will need around 80g of coffee. Adjust the ratio to your taste preference by experimenting within this range.

Question 2: Should I use pre-ground coffee or freshly ground coffee for my 8-cup Chemex?

Answer: It is always ideal to use freshly ground coffee for the best flavor and aroma in your cup of coffee. Coffee beans start losing their freshness and flavor shortly after being ground. Therefore, if possible, grind the beans just before brewing to ensure maximum flavor extraction. However, if you have to use pre-ground coffee, make sure it is freshly opened and stored properly to minimize loss of flavor.

Question 3: How long should I let the coffee brew in my 8-cup Chemex?

Answer: The brew time in the Chemex can vary depending on personal preference and the grind size of the coffee. On average, it is recommended to let the coffee steep for about 4-5 minutes. If you find the coffee to be too weak, you can increase the brew time slightly. Likewise, if it is too strong, decrease the brew time. Experimenting with different brew times will help you find your desired taste profile.

Question 4: Can I use a paper filter with my 8-cup Chemex?

Answer: Yes, the Chemex is designed to be used with its specific paper filters, which are thicker compared to other pour-over coffee methods. These filters help in producing a clean and crisp cup of coffee, while also removing any unwanted oils or sediment. So, it is recommended to use the Chemex paper filters for the best results.

Question 5: How should I clean my 8-cup Chemex after brewing?

Answer: Cleaning the 8-cup Chemex is a fairly simple process. Rinse the brewer with warm water to remove any leftover coffee grounds. Use a soft brush or sponge to gently scrub the interior of the Chemex to remove any stains. Avoid using soap or any abrasive cleaners, as they might leave residue behind. Finally, make sure to thoroughly rinse the Chemex to remove any cleaning agents before your next use.

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Matty Victor

An expert in tasting the nuances of coffee. often talks about the different flavors of coffee from different regions of the world "The taste of coffee is an endless journey."


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