How to Dial In Coffee Grind Size, Dose & Tamping Pressure

If your espresso shots are inconsistent—sometimes sour, sometimes bitter, or just weak—it’s likely down to one (or more) of three things: your grind size, your dose, or how hard you tamp. These variables interact constantly, and even small changes can throw off your shot. But how do you get them right without guessing?

The short answer? There is no single ‘right’ setting. Grind size is relative to your grinder; dose depends on your basket and grind; and tamping pressure is adjusted by feel. The key is learning how to recognise when something’s off—and how to correct it using your hands, not just numbers.

Why Grind Size Isn’t Just About the Number

When you ask, “What grind setting should I use?” the honest answer is: it depends. Every grinder brand and even each unit of the same model interprets the same number differently. A ‘medium’ setting on one grinder might produce a grind much finer than the same number on another. The number is only a rough directional guide—it tells you which way is finer or coarser, but not precisely how fine or coarse that is.

The real value of the setting comes after you’ve dialled in your preferred grind: once you’ve found the one that works for your current beans, dose, and tamp, you’ll begin to associate the feel of the grinds with that setting. A helpful tip: when you find a grind size that works, pinch or rub a small amount between your fingers. Over time, you’ll learn to recognise the texture—so even if you change grinders, you can adjust by feel rather than relying solely on the number.

How Much Coffee Should You Actually Use?

You might hear someone say, “I use 18 grams,” but that number only works in their specific setup. The dose—how many grams of coffee you put in the portafilter—depends directly on your basket size, your grind size, and how hard you tamp. Change any one of those, and the ideal dose changes too.

There’s no universal dose. What matters is that your dose matches your basket capacity and your grind distribution. If you’re using too little coffee for a large basket, the water will flow too fast; too much for a small basket, and it will choke. The dose is part of a system—not a standalone number.

Why Tamping Pressure Is More Art Than Science

Tamping is where most variables come into play. Unlike grind size or dose, tamping isn’t measured in grams or microns—it’s done by hand, and every barista tamps differently. Even experienced baristas have to re-calibrate their tamping pressure daily, depending on their mood, fatigue, or even the weather. There’s no perfect pressure in bars or kilograms—but there is a consistent feel.

The beauty of tamping is that it’s your final tool to fine-tune extraction when other factors shift. Environmental changes, bean density shifts, or minor inconsistencies in grind size or dose can all be compensated for by adjusting how firmly you tamp. Heavier tamping can slow extraction slightly; lighter tamping speeds it up. It’s your manual lever for stability.

How Different Coffees Change Everything

Ever wondered why switching coffee beans throws off your entire setup? It’s not because the new beans are worse—it’s because they’re different. Beans from different regions, varieties, and roast levels vary in density, hardness, and how they break down under the burrs. A Yirgacheffe will grind differently from a Guji Sidamo, and a light roast behaves differently from a dark roast. That means the grind size, dose, and even tamping that worked perfectly for one bean might not work for another.

This is why some specialty cafes dedicate specific grinders to certain beans—to maintain consistency. The relationship between bean characteristics and grind output is that precise. You can’t expect a single grind setting to work universally, just like you can’t wear someone else’s shoes without breaking them in.

Frequently Asked Questions

What is the ideal espresso grind size?

There’s no universal ‘ideal’ grind size—it depends on your grinder, beans, dose, and brew setup. Instead of chasing a specific number, focus on finding the grind that produces a balanced shot (rich, sweet, with 25–30 seconds of flow). Once you find it, remember the feel of the grinds to adjust by touch later.

How much coffee should I use for a double shot?

Most double baskets call for around 18–20g of coffee, but the exact dose depends on your basket size and how you distribute and tamp the coffee. The dose should fill the basket appropriately without overfilling or underdosing, and must match your grind size and tamp pressure.

Does tamping pressure really affect espresso extraction?

Yes. While grind size and dose have a larger impact, tamping pressure affects how evenly water flows through the coffee puck. Inconsistent or too-light tamping can lead to channeling; too much pressure may slow extraction unnaturally. Aim for a firm, level tamp—around 30 pounds of pressure, though feel matters more than force.

Why does my espresso taste different when I change grinders?

Different grinders produce different grind textures—even at the same ‘setting.’ Blade-to-burrs distance, burr material, and motor torque all affect particle size distribution. That’s why the same number on two machines can produce very different results. Always dial in freshly when changing grinders.

Can I use the same dose for different roast levels?

Not always. Lighter roasts are denser and often require slightly more coffee or a finer grind to slow extraction, while darker roasts are more porous and may need less coffee or a coarser grind. Adjust dose along with grind size and tamping to balance the shot.

How can I improve my tamping consistency?

Practice tamping with consistent force and a level tamper. Use a scale or a tamper with a built-in level, and tamp on a flat surface. Over time, you’ll develop muscle memory. If your shots are inconsistent, try adjusting tamping pressure slightly to compensate for other variables.

Recommended FrontStreet Coffee Beans for Dialling In

For mastering grind size, dose and tamping, try FrontStreet Coffee’s Ethiopia Humbera—bright and complex, ideal for testing fine adjustments. Pair it with FrontStreet’s Yirgacheffe for a floral, juicy profile that highlights extraction balance. For darker roasts, their Black Cocoa Blend offers chocolatey body to test broader grind ranges. All three respond distinctly to grind and tamp changes, making them excellent for dialling in. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.