How To Make Chemex Coffee: Perfect Pour-Over Guide

To make Chemex coffee, use medium coarse grounds, hot water, slow pours, and a clean paper filter.

Learning how to make Chemex coffee is simple, but small details shape the final cup. The right grind, water temperature, pouring rhythm, and brew time can create coffee that tastes bright, smooth, and free of grit. This guide explains how to make Chemex coffee with clear steps, tested ratios, common fixes, and practical tips you can use at home.

What Is Chemex Coffee?

Chemex coffee is a type of pour-over coffee brewed in a glass Chemex brewer. The brewer uses a thick paper filter that removes much of the coffee oil and fine sediment. The result is usually a clean, light-bodied cup with clear flavors.

The Chemex brewer was designed in 1941 by German chemist Peter Schlumbohm. Its hourglass shape is both useful and attractive. The upper section holds the coffee and filter, while the lower section collects the brewed coffee.

Learning how to make Chemex coffee gives you more control than using an automatic coffee maker. You control the water flow, contact time, and coffee ratio. Think of it as guiding the water through the grounds rather than simply pressing a button.

A Chemex can brew several cups at once, depending on its size. A six-cup model often makes about 30 ounces of coffee, while a three-cup model is better for one or two people.

What You Need to Make Chemex Coffee

Before learning how to make Chemex coffee, gather the right tools. Good equipment helps, but you do not need a costly setup to begin.

You will need:

• A Chemex brewer
• Chemex paper filters
• Fresh coffee beans
• A burr grinder
• A digital kitchen scale
• A gooseneck kettle, if possible
• Clean, fresh water
• A timer
• A mug or serving cup

A burr grinder is useful because it produces more even coffee particles than a blade grinder. Even grounds extract at a more balanced rate. Blade grinders often create a mix of powder and large pieces, which can make the coffee taste both bitter and weak.

Use filtered water when your tap water has a strong smell or taste. Water makes up most of the final drink, so poor water can hide the flavor of good beans. Coffee professionals often recommend water with balanced mineral content, rather than completely distilled water.

For this guide on how to make Chemex coffee, a scale is one of the best upgrades. It helps you repeat a recipe and adjust it with confidence.

The Best Coffee-to-Water Ratio

A good starting ratio for how to make Chemex coffee is 1 gram of coffee for every 16 grams of water. This is often written as a 1:16 ratio.

For one large mug, try:

• 30 grams of coffee
• 480 grams of water
• A final brew time of about 4 to 5 minutes

For two smaller cups, try:

• 40 grams of coffee
• 640 grams of water
• A final brew time of about 5 to 6 minutes

You can change the ratio based on taste. Use more coffee for a stronger cup. Use less coffee for a lighter cup.

A simple guide is:

• 1:15 creates a stronger, richer brew
• 1:16 creates a balanced brew
• 1:17 creates a lighter, more delicate brew

Do not treat these numbers as strict rules. Coffee beans vary by origin, roast level, age, and density. The ratio is your starting map, not the final destination.

When I first learned how to make Chemex coffee, I used a measuring spoon instead of a scale. My results changed from one morning to the next. The scale solved that problem and made it much easier to understand what each adjustment did.

Choosing Coffee Beans for a Chemex

The Chemex works well with many coffee styles, but light and medium roasts are especially popular. These roasts often show fruit, floral, citrus, caramel, or tea-like notes.

Choose whole beans when possible. Coffee begins to lose aroma after grinding because more surface area touches the air. Grinding just before brewing helps preserve the bean’s flavor.

Look for a roast date on the package. Beans are often best after a short resting period following roasting. Many coffees taste balanced between several days and a few weeks after the roast date, though the ideal window depends on the coffee and storage method.

Good choices include:

• Ethiopian coffee for floral and berry notes
• Colombian coffee for caramel and balanced fruit flavors
• Guatemalan coffee for chocolate and spice notes
• Kenyan coffee for bright acidity and berry flavors
• Brazilian coffee for nutty, sweet, and full flavors

Avoid storing coffee in the refrigerator. Moisture and food odors can damage its flavor. Keep the beans in an airtight container in a cool, dark cabinet.

Learning how to make Chemex coffee also means learning how to taste it. If the cup tastes sharp and sour, it may need more extraction. If it tastes dry and bitter, it may need less extraction.

How to Make Chemex Coffee Step by Step

This method explains how to make Chemex coffee with a balanced recipe. It works well for most light and medium roast beans.

1. Heat the water

Heat the water to about 195 to 205°F. If you do not have a thermometer, bring the water to a boil and let it rest for about 30 to 60 seconds.

Very hot water can extract harsh flavors, especially from dark roast coffee. Water that is too cool may leave the coffee sour, thin, or underdeveloped.

2. Fold and place the filter

Open the Chemex paper filter into a cone. Place the thicker, three-layer side over the pouring spout. The single-layer side should face the opposite wall.

This placement helps air escape during brewing. It also keeps the filter from sealing tightly against the brewer.

3. Rinse the filter

Pour hot water around the inside of the filter. This removes much of the paper taste and warms the Chemex.

Let the water drain fully, then discard it. Be careful when holding the glass brewer because it may become hot.

4. Grind the coffee

Grind the beans at a medium coarse setting. The grounds should look a little coarser than table salt.

If the coffee drains too slowly, make the grind slightly coarser. If it drains too quickly, make the grind slightly finer. Change only one setting at a time so you know what caused the result.

5. Add the coffee

Place the ground coffee into the rinsed filter. Gently shake the Chemex to create a flat coffee bed.

A level bed helps the water move through the grounds evenly. Do not press or pack the coffee down.

6. Bloom the coffee

Start your timer and pour about twice the weight of the coffee in water. For 30 grams of coffee, pour about 60 grams of water.

Make sure all the grounds become wet. Let the coffee bloom for 30 to 45 seconds.

The bloom allows trapped carbon dioxide to escape. Fresh coffee often expands and bubbles during this stage. Skipping the bloom can lead to uneven extraction because gas may block water from reaching some grounds.

7. Pour in slow circles

After the bloom, pour the remaining water slowly. Use small circles and avoid pouring directly onto the paper filter.

For a 30 gram recipe, you might pour in stages:

• Pour to 200 grams
• Wait briefly
• Pour to 340 grams
• Pour to 480 grams

Keep the coffee bed gently covered with water, but do not flood the brewer. A steady flow gives you better control than one large pour.

8. Let the coffee drain

Allow the water to pass through the grounds. The total brew time will often be about 4 to 6 minutes, depending on the recipe, grind, and brewer size.

Remove the filter when the coffee finishes draining. Swirl the brewed coffee in the Chemex before serving. This mixes the stronger coffee from the beginning with the lighter coffee from the end.

This step-by-step method is the foundation of how to make Chemex coffee. Once it tastes good, change one detail at a time to develop your own recipe.

How to Improve Your Chemex Brewing Technique

The pouring style can change the cup as much as the coffee itself. Pour gently and keep the kettle close to the coffee bed. A high pour can disturb the grounds and cause uneven extraction.

Try to pour in controlled circles. Start near the center, move toward the edges, then return to the center. Avoid pouring on the paper because water may run down the side without passing through the coffee.

Keep the coffee bed level. If one side rises higher than the other, the water may find an easier path through the lower side. This is called channeling, and it can create a cup with both bitter and sour flavors.

Use the same recipe for several brews before making major changes. When I test how to make Chemex coffee with a new bean, I keep the ratio and water temperature steady first. Then I adjust the grind based on taste and brew time.

A gooseneck kettle gives you more control, but it is not required. A regular kettle can work if you pour slowly and carefully.

How Grind Size and Brew Time Affect Flavor

Grind size controls how quickly water moves through coffee. It also affects how much flavor the water extracts.

A finer grind has more surface area. Water extracts flavor more quickly, and the brew may take longer to drain. A coarse grind lets water pass more quickly and may produce a lighter cup.

Use these signs to guide your adjustments:

• Sour, sharp, or thin coffee may need a finer grind or longer brew time.
• Bitter, dry, or harsh coffee may need a coarser grind or shorter brew time.
• Weak coffee may need more coffee or a finer grind.
• Strong coffee may need more water or less coffee.
• A slow, blocked drawdown may mean the grind is too fine.

Do not rely on brew time alone. Taste matters more than a specific number. A five-minute brew can taste excellent with one coffee and unpleasant with another.

The goal of how to make Chemex coffee is balance. You want sweetness, pleasant acidity, and a clean finish. You do not need to chase a perfect timer reading.

Common Chemex Mistakes to Avoid

Many problems with Chemex coffee come from small habits. The good news is that most are easy to fix.

Using a very fine grind

A fine grind can slow the filter and create a bitter or dry taste. Start with a medium coarse grind, then adjust in small steps.

Skipping the filter rinse

Unrinsed filters may add a papery flavor. Rinsing also warms the brewer and helps the filter sit in place.

Pouring too fast

Fast pouring can overflow the filter or disturb the coffee bed. Slow, steady pours give the coffee more even contact with water.

Using stale beans

Old beans may taste flat, dull, or papery. Buy smaller amounts and store them in an airtight container.

Ignoring water quality

Strongly chlorinated or mineral-heavy water can affect the taste. Use clean filtered water when needed.

Moving the filter during brewing

Avoid pressing or stirring the filter. Excess movement can push fine particles into the paper and slow the brew.

Making too many changes at once

If you change the grind, ratio, water temperature, and pouring style together, you will not know what improved the cup. Change one variable at a time.

These lessons made how to make Chemex coffee much easier for me. Early on, I blamed the beans when the real problem was an uneven pour and a clogged filter.

How to Make Chemex Coffee Without a Scale

A scale is best, but you can still make Chemex coffee without one. Use a consistent scoop and measuring cup.

As a rough guide, one level tablespoon of whole coffee beans may weigh about 5 grams. Bean size and density can change this amount, so treat it as an estimate.

For one large cup, use about 6 tablespoons of whole beans and roughly 2 cups of water. Grind the beans and follow the same bloom and pour method.

This approach will not be as precise as weighing each ingredient. Still, it can produce a pleasant cup if you keep your measurements consistent. If you enjoy the process, a basic digital scale is an affordable and useful upgrade.

Cleaning and Caring for a Chemex

Clean the Chemex after each use. Remove the filter and coffee grounds, then rinse the brewer with warm water.

For deeper cleaning, use a small amount of gentle dish soap and a soft brush. Rinse well so no soap remains. Some Chemex models have a wooden collar and leather tie, so avoid soaking those parts.

Coffee oils can build up over time. A periodic deep clean with a coffee equipment cleaner can remove residue that affects flavor. Follow the cleaner’s instructions and rinse the brewer thoroughly.

Never pour boiling water into a cold glass Chemex. A sudden temperature change can cause thermal shock. Warm the glass gradually, especially in a cold kitchen.

Good care helps the brewer last for years. It also keeps each batch of how to make Chemex coffee tasting clean and fresh.

Chemex Coffee Compared With Other Brewing Methods

Chemex coffee has a cleaner body than French press coffee because its thick paper filter catches fine sediment and much of the oil. French press coffee often feels heavier and richer.

Compared with a standard drip machine, Chemex coffee gives you more control over pouring and extraction. An automatic machine is faster and more convenient, but it may offer less control.

Compared with a smaller pour-over brewer, a Chemex is often better for serving several people. It also has a distinct glass design and a smooth, clear cup profile.

The main limitation is time. How to make Chemex coffee well requires attention. You must heat water, grind beans, pour in stages, and clean the brewer afterward.

PAA Questions About How to Make Chemex Coffee

How much coffee do you use for a Chemex?

Use about 30 grams of coffee for 480 grams of water as a starting recipe. This creates roughly one large mug or two smaller cups, depending on serving size.

What grind size is best for Chemex coffee?

Use a medium coarse grind. If the coffee tastes sour and drains too quickly, grind slightly finer; if it tastes bitter and drains slowly, grind slightly coarser.

How long should Chemex coffee take?

A typical brew takes about 4 to 6 minutes. The exact time depends on the coffee dose, grind size, water flow, filter, and brewer size.

Should you rinse a Chemex filter?

Yes. Rinsing removes much of the paper taste, warms the brewer, and helps the filter stay in place. Always discard the rinse water before adding coffee.

Can you make iced coffee with a Chemex?

Yes. Brew a stronger batch over ice by using less hot water and placing ice in the lower Chemex. For example, brew 30 grams of coffee with 300 grams of hot water over about 180 grams of ice.

Why does my Chemex coffee taste bitter?

Bitter coffee may result from a grind that is too fine, water that is too hot, or a brew time that is too long. Try a slightly coarser grind and check that the water is around 195 to 205°F.

Why is my Chemex coffee weak?

Weak coffee may come from too little coffee, a grind that is too coarse, or water passing through too quickly. Add more coffee or grind slightly finer, then compare the result.

Conclusion

Learning how to make Chemex coffee comes down to a few repeatable habits: use fresh beans, choose a medium coarse grind, measure your coffee and water, rinse the filter, bloom the grounds, and pour slowly.

Start with a 1:16 ratio, water around 195 to 205°F, and a brew time near 4 to 6 minutes. Then taste the coffee and make one small adjustment at a time. With practice, how to make Chemex coffee becomes less like a strict recipe and more like a simple morning craft.

Try the method with your favorite beans, write down what you change, and refine your cup over time. Share your best Chemex recipe or explore more brewing guides to keep improving your coffee.