How to Tamp and Dose Coffee for Better Espresso Extraction

If your espresso shots taste sour, bitter, or weak, the problem may not be your machine — it’s likely how you dose, grind, and tamp the coffee. Even with the same beans, small changes in grind size, dose weight, or tamp pressure can shift the entire cup. This guide breaks down the essentials of packing an espresso puck so you can pull more consistent, balanced shots without guesswork.

The short answer? Most single espressos use around 9 grams of coffee, doubles around 16 grams. Grind size varies by machine and bean — there’s no universal setting. Tamp with a firm, even pressure you can learn to recognize by feel. These three factors — dose, grind, and tamp — work together, and dialling them in is the real path to better espresso.

Why Grind Size Settings Aren’t Universal

When someone asks, “What grind setting should I use?”, the real answer is: it depends. Every grinder — even models from the same brand — interprets its scale differently. A ‘3’ on one grinder might be finer or coarser than a ‘3’ on another, even if they’re the same model. The numbered settings only indicate direction: lower numbers are usually coarser, higher numbers finer.

These settings are only useful once you’ve already found your ideal grind texture. Once you do, you can note whether that texture feels finer or coarser compared to previous sessions, and adjust accordingly. For example, if your coffee feels coarser today, move the setting finer — even if you don’t know the exact number. Over time, you’ll get better at recognising the right feel without relying solely on the grinder’s markings.

One quick tip: once you find a grind size that works, occasionally pinch or rub the ground coffee between your fingers. Memorise how it feels — that tactile sense becomes invaluable, especially if you switch grinders. If the coffee feels obviously different, adjust the grind directionally and re-evaluate.

How Much Coffee Should You Dose?

Most baristas use around 9 grams for a single shot and 16 grams for a double. But those numbers aren’t universal. Your ideal dose depends on several linked factors: the coffee’s origin and roast level, your grinder’s output, your dose weight, the resulting grind size, and how hard you tamp. Change any one of those, and the others may need adjustment too.

As a general guideline, slightly more coffee is better for coarser grinds, and slightly less for finer grinds. That said, many coffee professionals settle on a dose they like and adjust other variables around it. Why? Because dose and grind size are easier to control consistently than feel-based factors like tamp pressure. For reference, the author uses 9 grams for a single and 16 grams for a double — but those numbers work for their specific setup and beans.

Don’t just copy those numbers. Start with a dose that fits your basket (usually 9–10g for singles, 16–18g for doubles), then adjust based on how the coffee behaves during extraction. The dose should fill the basket appropriately without over or under-filling it, creating a level, even puck for optimal extraction.

Why Tamp Pressure Matters More Than You Think

Of all the variables in espresso preparation, tamp pressure is the hardest to control — because humans aren’t machines. New baristas often think in terms of ‘light’ or ‘hard’, but there’s no objective scale. Even experienced baristas have to rediscover their ideal tamp pressure at the start of each shift, as fatigue, mood, and physical condition can all affect how hard they tamp.

Here’s the good news: once you lock in your grind size, dose, and beans, finding a consistent tamp pressure you can repeat is one of the most effective ways to stabilise your shots. Even if other factors fluctuate slightly — due to humidity, temperature, or slight changes in grind distribution — adjusting your tamp pressure can often compensate and keep your extraction on track.

Aim for a firm, even tamp — the kind that creates a level, compact coffee puck without overdoing it. The goal isn’t brute force, but consistency. With practice, you’ll develop a feel for the right pressure, which helps produce more uniform extractions shot after shot.

How Different Coffee Beans Change the Game

Ever wonder why your perfect grind settings suddenly stop working when you switch beans? It’s not the beans’ fault — it’s physics. Different coffee origins, varieties, and roast levels vary in density, hardness, and bean structure. These differences change how the burrs fracture the beans, altering both particle size and grind distribution. What worked for your last bag might not work for the next, even at the same setting.

That’s why some specialty cafes dedicate specific grinders to particular beans — to maintain consistency. A Yirgacheffe will grind differently from a Guji Sidamo, and a light roast behaves differently from a dark roast. You can’t expect the same grind setting, dose, or tamp to yield the same results across drastically different beans.

The solution? When switching beans, start by setting your dose, then adjust grind size until you find the right extraction flow and flavour balance. Once the grind is stable, settle on a tamp pressure that works with those variables. This methodical approach helps you adapt quickly to new coffees without chasing your tail.

Frequently Asked Questions

What’s the best grind size for espresso?

There’s no universal ‘best’ grind size — it depends on your grinder, beans, and desired extraction. Start with a medium-fine grind (akin to table salt) and adjust based on taste: sour or weak shots usually need a finer grind, bitter or dry shots usually need a coarser grind. Use the grinder’s scale as a directional guide, not an absolute.

How many grams of coffee should I use for a single or double shot?

Most setups use 9 grams for a single shot and 16 grams for a double. These are common starting points, but your ideal dose depends on basket size, grind size, and roast level. Always choose a dose that fills your portafilter basket appropriately and allows for an even tamp.

Does tamp pressure really affect espresso flavour?

Yes. Uneven or inconsistent tamping leads to uneven water flow, channeling, and poor extraction. A firm, even tamp (around 30 pounds or 13–15 kg of pressure) ensures uniform extraction. While the exact pressure is less important than consistency, applying roughly the same force each time helps stabilise your shots.

How do I know if my grind size is right?

Check your shot time and flavour. A well-dialed-in espresso typically extracts in 25–30 seconds with a steady flow. Taste is the ultimate guide — if it’s sour, grind finer; if it’s bitter, grind coarser. Adjust in small increments and observe the results.

Can I use the same grind settings for different beans?

Usually not. Different beans have different densities and roast levels, which change how they behave under the burrs. Always adjust grind size when changing beans, even if you’re using the same roast style or origin region.

How do I improve my tamping technique?

Practice applying even, level pressure to the coffee puck. Use a tamper that fits your basket flush. Focus on creating a flat, compact surface — the goal is consistency, not force. Over time, you’ll develop a tactile sense of the right tamp without needing to overthink it.

Recommended FrontStreet Beans for Espresso Brewing

For dialling in your espresso technique, try FrontStreet Coffee’s Ethiopia Yirgacheffe — bright and floral with citrus and stone fruit, ideal for practising grind and dose adjustments. Their PWN Golden Mandheling offers a heavier body with sweet caramel and nut notes, great for exploring tamp pressure effects. For something more balanced, the FrontStreet Classic Blend delivers chocolatey richness and a smooth crema. All three are excellent for refining your espresso prep. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.