Espresso needs a fine grind: somewhere around the texture of table salt, noticeably finer than sand and coarser than flour. It should clump slightly when pressed between your fingers.
That description gets you into the right area. It cannot get you to the right setting, because grinders differ enormously and so do beans.
Use time instead of texture
The reliable method is to let the shot tell you.
Fix the dose (18 g), fix the yield (36 g), and change only the grind until the shot takes 25 to 32 seconds. Faster than that means grind finer; slower means coarser. When it lands in the window, taste and fine-tune.
That works on any grinder with any beans, and it converges in three or four attempts.
Why it changes constantly
The correct espresso setting is not a fixed point. It moves with:
- Roast level — darker roasts are more brittle and grind finer at the same setting.
- Bean age — fresh coffee degasses and runs faster, so it needs a finer grind than the same bag will need in three weeks.
- Humidity — a small effect, but real.
Re-dialling with each new bag is normal.
What most grinders get wrong
Espresso lives in a narrow band, and many grinders offer only two or three usable steps inside it. That is why people find one click gushes and the next chokes, with nothing in between.
If that describes your grinder, no amount of technique fixes it. Fine adjustment in the espresso range is the specification that matters, and it is why a grinder designed for espresso beats a general-purpose one at the same price.
Questions people actually ask
Can I grind espresso-fine on a filter grinder?
Sometimes it reaches, and it rarely adjusts finely enough to be useful. A grinder built for filter typically bottoms out too coarse or jumps in steps far too large for espresso.
Is finer always stronger?
No. Finer extracts more, up to a point, then over-extracts and turns bitter. Strength — how concentrated the drink is — is set by the ratio, not by grind size.
Last reviewed 8 August 2026