How to Grind Coffee Beans: Dose, Grind Size & Tamping Explained

If your espresso shots taste sour, bitter, or weak, the problem might not be your machine—it’s likely how you’re grinding, dosing, or tamping your coffee. Getting these three factors right is the foundation of a balanced shot, yet they’re often treated as afterthoughts. Here’s how to take control.

The short answer? There’s no universal setting. Your ideal grind size depends on your specific machine, beans, and dose. Start with a dose of 9g for a single shot and 16g for a double, adjust your grind setting until the extraction feels right, then fine-tune with tamping pressure. Keep reading to understand why these variables matter and how to adjust them effectively.

Understanding Grind Size

When you ask, “What grind setting should I use?” the real answer is: it depends. Grinder settings—those numbered or lettered dials—are not universal. A ‘4’ on one brand’s grinder might produce a completely different grind size than a ‘4’ on another, even if they’re the same model. The setting only tells you which direction is finer or coarser. Once you find a grind size that works for your setup, the number becomes a rough reference point. But that’s only if you don’t change beans, dose, or tamp pressure.

Here’s a helpful tip: once you’ve dialed in a grind size you like, get familiar with how it feels between your fingers. Is it coarse like sea salt or fine like powdered sugar? Over time, you’ll be able to tell if the grind is off just by touch—even on a different grinder. If it feels noticeably coarser, adjust finer, and vice versa. This tactile feedback can save you a lot of trial and error.

Dosing: How Much Coffee to Use

How much coffee should you use for a single or double shot? The short answer is 9g for a single and 16g for a double—but that’s just a starting point. These numbers work for a specific combination of beans, grind size, dose, and tamp. Change any one of those, and the ideal dose may shift. As a general rule, coarser grinds can handle slightly more coffee, while finer grinds often need less to avoid over-extraction or channeling.

Many baristas settle on a comfortable dose that works most of the time, but it’s important to remember that dose is a variable, not a fixed rule. If you’re consistently tweaking your grind or tamping to get a balanced shot, your dose might need adjusting too. Keep your dose consistent when dialing in, but don’t be afraid to tweak it if other factors change.

Tamping Pressure: The Human Variable

Tamping is where things get subjective. Unlike grind size or dose, tamping pressure isn’t measured in grams—it’s based on feel. For beginners, this can be frustrating because there’s no exact number to aim for. Even experienced baristas have to re-calibrate their tamping technique daily, depending on their energy, focus, or even mood.

But here’s the upside: once you’ve locked in your grind size and dose, tamping is one of the most effective ways to fine-tune your extraction. If your shot is running too fast, a slightly firmer tamp can slow it down. If it’s pulling too slowly, ease up on the pressure. Because environmental factors like humidity or bean density can affect grind consistency, tamping is often the easiest variable to adjust on the fly to stabilize your shot.

How Coffee Beans Affect Grinding

Ever wonder why your grind settings suddenly stop working when you switch beans? It’s not (just) your grinder—it’s the beans themselves. Different coffee origins, processing methods, and roast levels all affect bean density and hardness. A light roast Ethiopian Yirgacheffe will grind differently than a dark roast Brazilian bean, even at the same setting. That’s why the grind size, dose, and tamping that worked perfectly for one bean might fall apart with another.

Many professional cafes use dedicated grinders for specific beans to maintain consistency. At home, the best approach is to settle on a bean you like, then adjust your dose, grind size, and tamping pressure to match. Don’t expect one setting to work across multiple beans—each coffee demands its own fine-tuning.

Step-by-Step: Dialing In Your Espresso

Here’s a practical approach to getting your grind, dose, and tamp dialed in:

• Start with a consistent dose: Use 9g for a single shot or 16g for a double as a baseline.
• Set your grind size: Begin with a medium-fine setting (around the middle of your grinder’s range) and adjust from there.
• Evaluate your shot: Taste your espresso. Is it sour and weak? Your grind is probably too coarse or your dose too low. Is it bitter and over-extracted? Your grind might be too fine or your dose too high.
• Adjust grind size first: If your shot is too fast (under 25 seconds), make the grind finer. If it’s too slow (over 35 seconds), go coarser.
• Fine-tune with tamping: If adjusting the grind doesn’t fix the issue, try tweaking your tamping pressure. A firmer tamp can slow extraction; a lighter tamp can speed it up.
• Use your senses: Over time, you’ll learn to recognize the feel of the right grind and the sound of a well-tamped puck.

Frequently Asked Questions

What is the ideal grind size for espresso?

There’s no single “ideal” grind size for espresso—it depends on your grinder, beans, dose, and brewing setup. Most home baristas start with a medium-fine grind, which is roughly the middle setting on their grinder. The key is to adjust until you get a balanced shot with a good extraction time (usually 25–30 seconds).

How much coffee should I use for a single or double shot?

A common baseline is 9g for a single shot and 16g for a double. However, the ideal dose can vary based on your grind size, tamp pressure, and the coffee you’re using. It’s best to start with these amounts and adjust based on the taste and flow of your shot.

Does tamping pressure really matter?

Yes. While grind size and dose have a bigger impact, tamping pressure affects how evenly water flows through the coffee puck. Too light, and you risk channeling; too firm, and you might over-extract. Aim for a consistent, firm tamp—about 30 pounds of pressure—and adjust as needed to fine-tune your shot.

Why does my grind setting stop working when I change beans?

Different beans have different densities and hardness levels based on origin, roast level, and processing method. A grind setting that works for one bean might be too fine or too coarse for another. Always adjust your grind, dose, and tamp when switching coffees.

Can I use the same grind setting for different brew methods?

No. Espresso requires a much finer grind than pour-over or French press. Each brewing method needs a specific grind size to achieve proper extraction. Using the same setting across methods will lead to under- or over-extraction.

How do I know if my tamp is too light or too firm?

A tamp that’s too light can cause uneven extraction and channeling, leading to sour or weak shots. A tamp that’s too firm can restrict water flow too much, causing bitterness. Aim for a level, compact puck and adjust based on the taste of your espresso.

Recommended FrontStreet Coffee Beans for Espresso

For dialing in your grind and dose, try FrontStreet Coffee’s Ethiopia Guji Huakui – a bright, fruity espresso with notes of blueberry, jasmine, and brown sugar. Pair it with FrontStreet’s Colombia Huila Supremo, offering a balanced profile of caramel, almond, and mild citrus. For a darker option, FrontStreet’s Yunnan Black Honey delivers chocolate, dried fig, and a syrupy body. All three beans respond well to fine-tuned grind settings and tamping. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.