How to Dial In Coffee Grind Size, Dose & Tamping for Espresso

If your espresso shots taste off—sour, bitter, weak, or under-extracted—it’s likely down to how you set your grinder, how much coffee you use, or how hard you tamp. These three variables control everything from flow rate to extraction yield, yet most home baristas treat them as afterthoughts. Here’s how to take control.

The short answer? For single espresso, use around 9g of coffee with a medium-fine grind and tamp with consistent medium pressure; for double, use roughly 16g. But those numbers only work if you fine-tune grind size, dose, and tamping to your specific setup and beans.

Why Grind Size Settings Aren’t Universal

Don’t trust the numbers on your grinder’s dial too much. A ‘4’ on one brand might be a ‘6’ on another—even two identical grinders from the same brand can perform differently. The grind setting scale merely shows direction: finer or coarser. Once you find the grind size that works for your coffee, the numbers become a rough reference point. But that’s only reliable if you don’t change beans, dose, or tamp pressure.

Here’s a pro tip: once you’ve dialed in the right grind, get familiar with how it feels. Pinch or rub the grounds between your fingers. Over time, you’ll recognise when the grind is too coarse or too fine just by touch. This helps massively if you switch grinders—you won’t have to rely solely on the numbers.

How Much Coffee Should You Dose?

Most baristas use around 9g for a single shot and 16g for a double. But those numbers aren’t universal. Your ideal dose depends on your beans, grind size, and tamp pressure—all of which influence extraction. As a rule, use slightly more coffee for a coarser grind and a bit less for a finer one. You can settle on a dose that works for your setup, since dose and grind are both relatively easy to control (grams are grams, after all).

For example, the author’s go-to is 9g for a single and 16g for a double—but your numbers might vary depending on your equipment and coffee. The key is to treat dose as part of a system with grind size and tamping, not an isolated number.

Why Tamping Pressure Is the Biggest Variable

This is where things get tricky. Unlike grind size or dose, tamping isn’t measured in grams or numbers—it’s all feel. Newbies often tamp too light or too hard without knowing it. Even experienced baristas need a moment to find their rhythm, especially if they’re tired, sore, or just had a bad morning. But here’s the upside: once you lock in your grind size, dose, and beans, adjusting your tamping pressure is one of the easiest ways to stabilise your shots.

If your espresso extraction is inconsistent due to minor changes in beans, humidity, or temperature, tweaking your tamp pressure can often compensate. It’s the most human variable—and also the most flexible for fine-tuning.

How Different Beans Change Everything

Switching coffee beans can throw off your entire setup. Different origins, varieties, and roast levels affect bean density and hardness, which changes how the coffee grinds and how it extracts. What worked for your last bag might not work for the next—even if the grind setting looks the same. That’s why some cafés use dedicated grinders for specific beans, to maintain consistency.

The solution? Once you’ve chosen your beans, set your dose first, then adjust grind size, and finally settle on a tamping pressure that feels repeatable. This order helps you adapt faster to new coffees without chasing your tail.

Frequently Asked Questions

What’s the best grind size for espresso?

There’s no single ‘best’ grind size—it depends on your beans, dose, and equipment. Start with a medium-fine grind (around a 4–6 on most grinders) and adjust based on taste. Finer grinds slow extraction and increase body; coarser grinds speed it up and reduce intensity.

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

A common starting point is 9g for a single shot and 16g for a double. However, your ideal dose depends on your grind size, tamp, and beans. Use these numbers as a baseline, but adjust based on extraction results.

Does tamping pressure really matter?

Yes. While grind size and dose are more precise, tamping pressure affects how evenly water flows through the coffee puck. Inconsistent tamping leads to channeling or uneven extraction. Aim for a firm, even tamp—around 30 pounds of pressure is a common guideline, but feel matters more than exact numbers.

Why does my espresso taste different when I use a different grinder?

Different grinders produce different grind distributions, even at the same setting. A ‘4’ on one grinder might be finer or coarser than a ‘4’ on another. Always dial in your grind from scratch when switching machines, even if the numbers appear similar.

How do I know if I’m tamping too hard or too soft?

Too light a tamp can cause uneven extraction and channeling; too hard can over-compress the puck and slow flow excessively. Aim for a consistent, even tamp with moderate pressure. If your shots are inconsistent, try adjusting your tamp pressure as a fine-tuning tool.

Can I use the same grind settings for different beans?

Usually not. Different beans have different densities and roast levels, which affect how they grind and extract. Always adjust grind size when changing beans, even if you keep the same dose and tamp.

Recommended FrontStreet Coffee Beans for Espresso

For dialling in grind size, dose, and tamping, try FrontStreet Coffee’s Ethiopia Humbera for bright, fruity complexity; their PWN Golden Mandheling offers heavy body and low acidity; or the Classic Blend for balanced, café-style espresso. Each responds well to precise grind adjustments and firm tamping. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.