How to Brew Coffee with Chemex Step by Step

If you’ve ever watched someone make coffee with a Chemex and wondered how they get it so clean and balanced, the secret lies in the details—right down to the grind size, water temperature, and pouring method. This classic hourglass-shaped brewer isn’t just for show; it produces a bright, crisp cup when done right. But without the correct steps, your Chemex coffee can taste thin, under-extracted, or overly bitter. Here’s exactly how to do it.

To brew with a Chemex, use 50–60g of coffee beans, grind them to a French press-like coarse consistency, and pour 1200–1400g of hot water using a gentle circular motion, starting from the center. Bloom the coffee for 30–45 seconds with twice the water weight of the grounds, then complete the brew in 2 minutes 30 seconds to 3 minutes for best results.

What You’ll Need to Brew Chemex Coffee

Brewing with a Chemex requires a few key pieces: a Chemex brewer (typically 6-cup, 8-cup, or larger), Chemex filters (thicker than standard paper filters), freshly roasted whole coffee beans, a digital scale, a grinder capable of a coarse grind, and a gooseneck kettle for controlled pouring. You’ll also need hot water heated to around 90–96°C (194–205°F), though the exact temperature isn’t specified in the original instructions. Using the correct tools ensures even extraction and a clean cup without paper or sediment flavors.

Step-by-Step: Brewing Coffee with a Chemex

1. Measure and Heat Your Water

Start by heating 1200–1400g of water. While the water heats, you’ll have time to measure and grind your coffee. The ideal brewing temperature typically falls between 90–96°C (194–205°F), though this range is not explicitly stated in the source. Use filtered water if possible to avoid off-flavors.

2. Weigh and Grind the Coffee

Weigh out 50–60g of coffee beans. Grind the beans to a coarse consistency, similar to what you’d use for a French press. This grind size is crucial—it’s coarse enough to slow down extraction through the thick Chemex filter, but fine enough to allow proper flavor release. Avoid grinding too fine, or you risk over-extraction and bitterness.

3. Prepare the Filter and Preheat

Open the Chemex filter so that three layers face the spout side and place it into the top of the Chemex. Pour a small amount of hot water over the filter to saturate it—this removes any paper taste and preheats the brewer and your serving vessel. You can also pour some hot water into your mug or carafe to warm it up. Discard the rinse water before proceeding.

4. Add Ground Coffee to the Filter

Place the freshly ground coffee into the wet filter. Give the filter a gentle shake or tap to settle the grounds evenly and ensure an even extraction. A level bed helps with consistent water flow during brewing.

5. Start the Bloom

Begin the brew by gently pouring twice the weight of the coffee grounds in water—so about 100–120g of water for 50–60g of coffee—starting from the center and spiraling outward. Do not pour water on the edge of the filter. Let the coffee bloom for 30–45 seconds. This allows trapped CO₂ to escape, improving extraction and enhancing aroma. The evenness of this initial pour affects the final cup flavor significantly.

6. Continue the Brew

After the bloom, continue pouring in gentle circles, moving from the center outward. Add water gradually until you reach a total of 1200–1400g. The entire pouring process—including the bloom—should take between 2 minutes 30 seconds and 3 minutes for optimal extraction. Maintain a steady, controlled pour to avoid channeling or uneven saturation.

7. Serve and Enjoy

Once the dripping slows and brewing is complete, remove the filter and discard the grounds. Swirl the Chemex gently to mix the brewed coffee, then pour and enjoy. The resulting cup should be clean, sweet, and well-balanced with a medium body—characteristic of a properly extracted pour-over.

Why These Steps Matter

The Chemex method highlights clarity and sweetness in coffee, thanks to its thick paper filter that removes much of the oils and fine particles. Each step—from grind size to bloom time to pour pattern—affects how evenly the water interacts with the coffee grounds. A coarse grind slows extraction to match the filter’s flow rate, while the bloom prepares the coffee bed for even saturation. Controlling pour speed and coverage prevents over- or under-extraction in different parts of the coffee bed.

Common Mistakes to Avoid

• Using too fine a grind, which can clog the filter and lead to over-extraction or long brew times.
• Not blooming the coffee, which can trap CO₂ and result in uneven extraction.
• Pouring too fast or unevenly, causing channeling where water finds the path of least resistance and over-extracts certain grounds.
• Ignoring water temperature, which, while not specified here, plays a critical role in extraction efficiency.

Frequently Asked Questions

What is the ideal coffee-to-water ratio for Chemex?

The article specifies using 50–60g of coffee with 1200–1400g of water, which works out to approximately a 1:20 to 1:24 coffee-to-water ratio. This is slightly lower concentration than a standard 1:15–1:17 pour-over ratio, resulting in a lighter, cleaner cup.

What grind size should I use for Chemex?

Use a coarse grind, similar to what you’d use for a French press. This prevents over-extraction and ensures the water flows properly through the thick Chemex filter without clogging.

How long should Chemex brew take?

The total brew time—including the initial bloom—should take between 2 minutes 30 seconds and 3 minutes. This timing helps ensure proper extraction without over- or under-developing flavors.

Do I need to preheat my Chemex?

Yes, it’s recommended to pour hot water over the filter to both rinse it and preheat the Chemex. This improves temperature stability during brewing and removes any papery taste.

Why should I bloom my coffee?

Blooming—pouring a small amount of water over the grounds and letting them sit for 30–45 seconds—releases trapped CO₂, allowing for more even saturation and better flavor extraction.

Can I use any coffee with Chemex?

Yes, but lighter to medium roasts tend to perform best, highlighting the method’s clarity and sweetness. The article recommends several single-origin beans suitable for pour-over, including Brazilian, Colombian, Ethiopian, and Kenyan varieties.

Recommended FrontStreet Coffee Beans for Chemex

For Chemex brewing, try FrontStreet Coffee’s BrazilBourbon for a smooth, nutty profile with a soft acidity and creamy body—ideal for showcasing clean extraction. The ColombiaSidra offers complex fruitiness with sweet stone fruit and floral notes, thanks to its double anaerobic processing. For a classic balanced cup, the EthiopiaYirgacheffeGedeb delivers bright citrus and floral tones with a clean, tea-like finish. All three beans are well-suited to the clarity and sweetness that Chemex highlights. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.