Fine, like powder. That is the answer everyone gives, and it is useless, because two grinders set to fine can differ by a factor of two. Here is how to find your grind without a chart.
What espresso grind should feel like
Pinch a sample between your fingers. Espresso grind should feel like fine sand with a few clumps, leaving a slight grey residue on your skin. If it feels like flour with no grit you are probably too fine. If you feel individual grains clearly, you are too coarse.
Not precise enough to dial in with, but it gets you into the right range in one or two attempts instead of five.
Why the grinder number means nothing
Grind settings are not standardised. A setting of 5 on one grinder and 5 on another have no relationship. Within one model, burr wear shifts the whole scale, and the zero point differs by a few clicks between units.
This is why espresso recipes never say set your grinder to 12. They say grind until the shot takes 27 seconds. Time and taste are the only portable reference.
Four ways to know your grind is right
Forget the chart. Use these instead:
- Time. A 1:2 shot should take 25 to 32 seconds from first drip. Faster means coarser, slower means finer.
- Flow at the start. Good espresso starts as thin dark stripes that merge into a single stream at 5 to 8 seconds. A gush means too coarse, nothing for 12 seconds means too fine.
- The puck after the shot. A good puck comes out as a firm intact disc. Soupy or muddy means too coarse or under-dosed. A visible hole means channelling.
- Taste. Sour and thin is under-extracted, so go finer. Bitter and drying is over-extracted, so go coarser. Sour and bitter together is channelling, which grind will not fix.
Fine versus too fine
There is a real upper limit. Past a certain point finer grind does not extract more. The puck compacts, water cannot penetrate evenly, and flow channels. The cup gets both sour and bitter and the shot time stops increasing.
If you keep grinding finer and the shot time does not change, you have passed that point. Back off and fix the puck instead: better distribution, a lighter tamp, a basket matched to your dose.
Grinder quality matters more than the setting
A blade grinder produces boulders and dust in the same dose. No setting fixes that distribution, because the problem is the spread, not the average.
A basic burr grinder, even a hand grinder, changes espresso more than any other upgrade. Conical burrs give more body and a wider sweet spot, flat burrs give more clarity. Both can make excellent coffee.