How to Brew Chemex Coffee (the Patient Cup, Step by Step)
The Chemex is the most theatrical of the home pour-over brewers. The wood collar, the leather tie, the hourglass shape — it looks like something out of a 1940s chemistry lab, which it is, because that's literally what it was designed for. The inventor, Dr. Peter Schlumbohm, was a chemist who wanted a brewer that used a paper filter thick enough to strip out most of the sediment and most of the oils that contribute to a heavy body. He got what he wanted. The Chemex cup is the cleanest, brightest, most tea-like pour-over you can make at home.
It is also the most unforgiving. The thick paper filter, the slow draw-down, the wide bed of grounds — every step matters. Get the grind wrong and the brew stalls. Get the ratio wrong and the cup is watery or harsh. Get the pour wrong and the bed channels and you get an uneven extraction.
This guide is the version we use when we brew Chemex at the roastery for a cupping session. It's slower than most home Chemex recipes because we find that a 4:30 to 5:00 brew pulls more clarity out of light-roasted single origins than the typical 3:30 fast pour. But the bones are the same. Adjust to your taste from there.
We brewed every test cup for this guide with our Costa Rica Single Origin — the bright citrus opens up in a Chemex the way light roast does nowhere else.
If you've never used a pour-over before and want the broader comparison first, see our French press vs pour-over vs Chemex post. And if you want to understand why we lean toward the longer Chemex brew, the how to brew pour-over coffee post goes deeper on pour-over mechanics.
What you need
A Chemex (3-cup for 1–2 servings, 6-cup for 3–4 people), the matching Chemex-bonded paper filter, a burr grinder, a gooseneck kettle, a kitchen scale, and a timer. The gooseneck is non-negotiable for the first few months — it gives you control over where the water hits the bed. Once you've brewed 30 or 40 cups, you can experiment with a regular kettle and adjust the pour pattern to compensate.
The Chemex-bonded filter matters too. The generic "basket" filters that fit a Chemex are 20–40% faster and let more sediment through. They make a different cup. Not worse, but different. If you bought a Chemex because of the clean cup, stick with the Chemex filters for a while.
Ratio and grind
Ratio: 1 gram of coffee to 16 grams of water. For a 3-cup Chemex (which holds about 350ml finished brew), that's 22 grams of coffee and 350 grams of water.
Grind: Medium-coarse. Think coarse sand, slightly finer than what you'd use for a French press, distinctly coarser than what you'd use for a V60. On a Baratza Encore, this is around the 18–22 setting. On a Comandante, it's roughly 22–26 clicks.
If your grind is too fine, the draw-down will exceed 5:30 and the cup will taste astringent and dry. If it's too coarse, the draw-down will finish under 4:00 and the cup will taste thin and sour. Aim for 4:30 to 5:00 total brew time once you pour the last of the water.
Water temperature: 200–205°F. Just off the boil. If you don't have a variable-temperature kettle, let the kettle sit 30–45 seconds after boiling before pouring.
Coffee: A light- to medium-roast single origin is what the Chemex was made for. Our Costa Rica, Colombia, or Tanzania all show beautifully in a Chemex. A heavy dark roast or a flavored coffee (mocha, Dubai chocolate) tends to come out flat and one-dimensional in this brewer — the thick paper filter pulls out too much of what makes those coffees interesting.
The brew, step by step
Step 1: Rinse the filter
Open the Chemex filter (it's a square folded into a cone — one side has three folds, the other has one; the three-fold side goes against the spout). Place it in the Chemex with the three-fold side against the pour spout. Pour 200–300 grams of just-boiled water through the filter, wetting it thoroughly and letting it drain into the carafe below.
This serves two purposes. First, it removes the papery taste from the filter — Chemex filters are noticeably thicker than V60 or Melitta filters, and that thickness comes with a flavor that you don't want in your cup. Second, it preheats the Chemex glass so the brew doesn't lose heat to the carafe.
Pour the rinse water out of the carafe before you start brewing. The Chemex doesn't have a separate drain valve, so this is awkward — just lift the filter out, dump the water, and put the filter back in. Yes, this is one more thing to do. Yes, it matters.
Step 2: Add coffee and tare
Put 22 grams of coffee into the rinsed filter (medium-coarse grind). Place the entire Chemex on the scale and tare to zero.
This is the moment where most home brewers mess up. The Chemex is wider at the top than a V60, so the bed of grounds is wider too. If you dump the grounds in the center and pour the water in the center, you get channeling on the sides and a thin, sour cup. The fix is to gently shake the Chemex side-to-side before you start pouring, so the grounds settle into a flat, even bed. Two shakes, no more.
Step 3: Bloom
Start your timer and pour 50–60 grams of water over the grounds in a slow, steady spiral from the center outward. Don't pour directly on the paper filter — keep your pour within the bed of grounds.
You should see the bed bloom: the grounds will rise slightly and release visible gas (CO2 from roasting). The bloom should last 30–45 seconds. If your coffee is very fresh (less than 7 days off-roast), the bloom will be aggressive and beautiful. If it's older (3+ weeks), the bloom will be subtle or invisible, and you'll get a flatter cup.
Don't skip the bloom or shorten it. The CO2 release is what lets the water saturate the grounds evenly. If you pour straight through without blooming, you get a cup that's half under-extracted (water couldn't reach the inside of the grinds) and half over-extracted (water sat too long on the outside of the grinds waiting for the gas to escape).
Step 4: Main pour in two stages
After the bloom completes (around 0:45), start your main pour. Go in slow spirals from the center outward, then back inward, keeping the water level roughly 1–1.5 inches above the bed. Don't let the water level drop below the surface of the bed between pours — that introduces air and disrupts the extraction.
Pour to a total of 200 grams of water by 1:30. Then pause for 30 seconds. Then pour to the final 350 grams by 3:00.
The pause at 1:30 is the move most home Chemex recipes skip, and it's the move that pulls the most clarity out of light-roasted coffees. The bed draws down to roughly half its height during the pause, which lets the next pour hit a denser, more uniform bed. This is the difference between a good Chemex cup and a great one.
Step 5: Draw-down and finish
Let the bed finish draining. The water should disappear through the bed between 4:30 and 5:00 after the start of your timer. If it's faster than 4:30, your grind is too coarse. If it's slower than 5:30, your grind is too fine.
Once the bed is dry, lift the filter out. The spent grounds will look like a flat, even puck — that's how you know the extraction was even. If there's a cone-shaped divot in the middle, you poured too centrally and the water channeled through the middle. If there's a ring around the edges, you poured too aggressively and the water went around the bed instead of through it. Adjust next time.
Pour the finished brew into mugs. The Chemex serves from the carafe, which is one of its underrated features — you can brew and bring to the table without a separate server.
Three common Chemex mistakes (and how to fix them)
Mistake 1: Brewing 3 cups when you want 1
The 3-cup Chemex doesn't brew 3 cups of finished coffee. It brews about 10–12 ounces of finished brew, which is 1 generous mug or 2 small ones. If you want more, use the 6-cup or brew into a separate server and refill.
The math trips people up because the markings on the Chemex are for water in, not coffee out. A 3-cup Chemex marked "3 cups" actually holds 350ml of water and produces about 300ml of brew, which is closer to 1.5 standard mugs.
Mistake 2: Reusing the filter
Don't. Chemex filters are cheap and designed for single use. Reusing a paper filter introduces variable flavors (residue from the previous brew) and slows the draw-down unpredictably. Use a fresh filter every time.
Mistake 3: Letting the brewed coffee sit on the grounds
Once the draw-down is complete, lift the filter out immediately. The brewed coffee continues to extract as long as it's in contact with the spent grounds, and the spent grounds contribute bitter, astringent compounds after about 30 seconds of contact. If you brew at 4:00 and forget the filter until 6:00, you'll taste it.
What the cup should taste like
A well-brewed Chemex should taste clean, bright, and layered. The thick paper filter strips most of the body and most of the oils, so what you get is the aromatic and acidic top notes of the coffee with very little sediment and very little of the heavy cocoa-nut notes that come through in a French press.
For a Colombia in a Chemex: dried orange up front, dark berry in the middle, chocolate in the finish. For a Costa Rica: sweet apple and raisin with a clean honey finish. For a Tanzania: black currant and wine with a long floral finish. The Chemex is the brewer that shows off the terroir of a coffee most clearly, because the filter doesn't get in the way of the flavor compounds that come from altitude, varietal, and processing.
If your cup tastes papery, you skipped the filter rinse. If it tastes sour, your grind is too coarse or your water is too cool. If it tastes bitter or astringent, your grind is too fine or your brew is too long. If it tastes flat or thin, you may have skipped the bloom or your coffee is past its prime.
When to use a Chemex (and when not to)
Use a Chemex when:
- You have 6–8 minutes to brew
- You're brewing for 1–3 people and want a clean, layered cup
- You're working with a light- or medium-roast single origin you want to taste clearly
- You're hosting and want a brewer that looks beautiful on the table
Don't use a Chemex when:
- You want a heavy, full-bodied cup (use a French press)
- You're brewing for 4+ people in a hurry (use an Aeropress in batches, or a drip brewer)
- You're working with a flavored or dark roast that depends on oils for character (use a metal-filter pour-over or French press)
- You're brewing very fresh coffee (less than 5 days off-roast) — the bloom will be so aggressive it'll blow the bed around and channel badly
The Chemex is the brewer for the patient cup. It's the brewer you pull out on a Sunday morning when you have time. It's not the brewer for a Tuesday morning when you're late for work. For Tuesday, use an Aeropress. For Sunday, use the Chemex.
If you're ready to try this on one of our coffees, our Costa Rica is the easiest Chemex brew in the catalog — it tolerates small grind and ratio mistakes better than most light-roast single origins, and the honey-apple notes come through beautifully in the thick paper filter. Our Colombia is the most rewarding — it has more flavor complexity than Costa Rica, but it asks you to be more precise.
Brew slow. Sip slow.