Brew Vero
Barista in PajamasGrind size by brew method, in microns
Clicks and dial numbers mean nothing between grinders. Microns mean something. Here is roughly where each method sits, and why the published ranges disagree more than most charts admit.
Browse all articles 13
Grinders
- Conical vs flat burrs: what actually changes
- Does burr size actually matter?
- Grinder habits that quietly cost you shots
- Grind size by brew method, in microns
Beans
- Roast levels, and why they change how you grind
- Washed, natural, honey: what processing does to the cup
- How long to rest coffee, and how to store it
Espresso
Technique
Every grind chart you have ever seen has the same problem: it tells you "medium-fine" and shows a photo of some brown powder next to some slightly different brown powder. Two people reading that chart will not arrive at the same grind, and neither will be able to tell the other what they did.
The fix is to talk in microns. A micron is a thousandth of a millimetre, and unlike "14 clicks on a Comandante" it means the same thing in every kitchen on earth.
The ranges
These are median particle sizes: the middle of the distribution, with half the coffee by volume finer and half coarser. They are starting territory, not targets.
| Method | Median | Notes |
|---|---|---|
| Turkish / ibrik | 40 – 220 µm | Flour. Most grinders cannot go here at all |
| Espresso | 200 – 400 µm | Narrow band; small moves change the shot a lot |
| Moka pot | 300 – 500 µm | Finer than filter, coarser than espresso |
| Aeropress | 300 – 900 µm | Enormous range because the recipes vary so much |
| Pour-over cone (V60) | 400 – 800 µm | Finer for smaller doses, coarser for larger |
| Siphon | 500 – 800 µm | Full immersion but with a fast, clean drain |
| Flat bottom (Kalita) | 600 – 900 µm | Slower bed, so slightly coarser than a cone |
| Chemex | 700 – 1000 µm | Thick paper clogs easily; go coarser than you think |
| French press | 800 – 1200 µm | Coarser also means less sludge in the cup |
| Cold brew | 1000 – 1500 µm | Very long contact time does the work instead |
Published ranges differ by hundreds of microns for the same method, and the disagreement is mostly about measurement, not coffee. Sieving, laser diffraction and photo analysis each answer a slightly different question, and a number can be weighted by particle count or by particle volume. Volume weighting pushes the median much higher, because one boulder outweighs thousands of fines. Any figure quoted without its method is only worth so much, including the ones in the table above.
Why your grinder's numbers will never match this
Two grinders set to "600 microns" will not produce the same coffee, and the same grinder will not produce 600 microns forever. Burr geometry changes the shape of the distribution around the median. Burr wear moves the whole curve over months. Retention means part of what you brew came from a previous, different setting. Bean density, roast level and humidity all shift where a given dial position lands.
This is why the useful workflow is not "look up the number and set it". It is: measure where you actually are, brew, taste, and move deliberately from a known starting point.
Spread matters as much as size
Median tells you where the middle sits. It says nothing about how tightly the rest clusters around it, and that spread is often the difference between a clean cup and a muddy one.
Two grinders can both sit at 700 µm while one produces a tight band and the other produces a mess of dust and boulders averaging out to the same figure. The tight one extracts more evenly. The wide one over-extracts its fines and under-extracts its boulders at the same time, which is how a cup ends up tasting simultaneously bitter and sour.
Chasing the right median while ignoring the spread is the most common way to be precise and wrong at once.
Moving in useful steps
For espresso, a change of roughly 20–30 µm is a noticeable shot. For filter, you need more like 50–100 µm before anything obvious happens. That is why espresso grinders have finer adjustment than filter grinders and why using an espresso grinder for French press feels like nothing is happening.
Faster brew methods need finer coffee, because contact time is short and you need surface area to extract quickly. Longer methods need coarser coffee, or the extra time takes you straight past pleasant into bitter.
Rather than guessing which range your dial corresponds to, photograph the grounds on the calibration mat and get a real median and spread for that exact setting.
Open the Grind Lab