How to Make a Single Cup of Coffee with a Chemex: Small Batch Brewing

Brewing a single cup of coffee with a Chemex might seem like overkill—after all, this iconic brewer is often associated with making multiple cups for a crowd. But with the right technique, your Chemex can produce an exceptional solo cup, highlighting the clarity and sweetness that made it a favorite among coffee enthusiasts since the 1940s.

Whether you're brewing just for yourself or want to experiment with a new coffee without committing to a full pot, this guide will walk you through the entire process. From choosing the right Chemex size to nailing the pour, you'll learn how to make a single serving that rivals your local café.

Why Brew a Single Cup with a Chemex?

The Chemex's thick paper filters and unique pour-over design produce a clean, sediment-free cup with bright acidity and a delicate body. While it's often associated with batch brewing, the same principles apply to smaller amounts. Brewing a single cup allows you to enjoy the full flavor profile of specialty beans without waste.

Additionally, using a smaller Chemex model, like the Six Cup Glass Handle CHEMEX® or the Ten Cup Glass Handle CHEMEX®, can be adapted for single servings by adjusting your coffee dose and water. However, for true small-batch brewing, you might also consider the Handblown Series, which offers elegant options that work beautifully for one.

• Perfect for testing new beans or roasts.
• No wasted coffee—brew only what you'll drink.
• Enjoy the clarity and sweetness that Chemex filters provide, even in a single cup.

Choosing the Right Chemex for Solo Brewing

While any Chemex can be used to brew a single cup, smaller models are more practical. The Six Cup Glass Handle CHEMEX® is a popular choice because it's manageable in size and still versatile for larger batches when needed. If you frequently brew just for yourself, you might also explore the Handblown Series, which includes beautifully crafted options that are ideal for one or two cups.

Regardless of the model, you'll need the correct size filter. For a single cup, a half-size filter (or a full filter folded to fit) works well. If you're using a larger Chemex, you can still brew a small batch by using less coffee and water, but be mindful that the coffee bed may be shallow, affecting extraction. For best results, stick to a brewer that's close to your serving size.

The Ideal Coffee-to-Water Ratio for a Single Cup

For a strong, flavorful cup, aim for a ratio of 1:15 to 1:17 (coffee to water). For a single cup (about 250 ml or 8.5 oz), that means using 15 to 17 grams of coffee. If you prefer a milder cup, adjust toward 1:17; for a bolder brew, go toward 1:15.

Grind size is crucial: you want a medium-coarse grind, similar to sea salt. Too fine will over-extract and cause bitterness; too coarse will under-extract and produce a weak, sour cup. If you're using a blade grinder, consider upgrading to a burr grinder for consistency.

• Use a digital scale for accuracy.
• Freshly grind your beans just before brewing.
• Experiment with the ratio to find your perfect strength.

Step-by-Step: Brewing a Single Cup with a Chemex

1. Heat your water to about 200°F (93°C) – just off the boil. While the water heats, place a filter in the top of your Chemex and rinse it with hot water to remove any paper taste and preheat the vessel. Discard the rinse water.

2. Add your ground coffee to the filter and gently tap the brewer to level the bed. Place the Chemex on a scale and tare it to zero.

3. Start your timer and pour just enough water (about twice the weight of the coffee) to saturate the grounds. This is the bloom. Let it sit for 30-45 seconds as the coffee releases carbon dioxide.

4. Continue pouring in a slow, circular motion, keeping the water level below the top of the filter. Aim to reach your target water weight (e.g., 250g) by about 2 minutes. Allow the water to drain completely.

5. The total brew time should be around 3 to 4 minutes. If it's too fast, grind finer; if too slow, grind coarser. Once done, remove the filter and enjoy your perfectly brewed single cup.

Tips for the Perfect Solo Cup

To enhance your experience, consider using a dedicated mug like the CHEMEX® Glass Mug, which is designed to showcase the clarity of your brew. Pair it with a stylish accessory such as the Painted Wood Collar and Bead to add a touch of elegance to your brewing ritual.

Cleanup is simple: discard the filter and grounds, rinse the Chemex with hot water, and let it air dry. With proper care, your Chemex will last for years, providing countless delicious single cups.

• Preheat your mug to keep your coffee hot longer.
• Use filtered water for the best flavor.
• Keep a brewing journal to track your ratios and recipes.

Brewing a single cup with a Chemex is a rewarding ritual that lets you savor the nuances of your favorite beans. Whether you choose a classic model or a handblown piece, the key is to control your variables and practice. Ready to elevate your solo brewing? Explore the Six Cup Glass Handle CHEMEX® to get started, and enjoy a perfect cup every time.