Grind Size Chart: Microns by Brew Method

Grind size is the average particle diameter of ground coffee, measured in microns. One micron is a thousandth of a millimetre, so an espresso grind at 200 to 400 microns is between a fifth and four tenths of a millimetre across. The rule behind every number on this page is simple: the less time water spends in contact with the coffee, the finer the grind has to be to extract enough. Espresso has 25 to 30 seconds and needs the finest common grind. Cold brew has 12 to 24 hours and needs the coarsest.

What is the grind size chart in microns for every brew method?

Micron figures for coffee are ranges rather than points, because any grinder produces a distribution of particle sizes rather than a single size. The numbers below describe where the bulk of the grounds should sit for that method. The tactile description in the third column is the practical test, since almost nobody owns a sieve set.

Notice how narrow espresso is. The gap between 200 and 400 microns is 200 microns wide, while pourover spans 400 and French press to cold brew spans 500. Espresso is not merely finer, it is a smaller target, and on most grinders that entire target fits inside a fraction of one turn of the adjustment. That is the physical reason a grinder sold for filter brewing feels impossible when you point it at a portafilter: its steps are sized for a target ten times wider.

Why are grinder settings not transferable between models?

A grind setting number is a position on one specific machine, not a unit of measurement. Three things make the same number mean different sizes on different grinders.

First, burr geometry. A 64 mm flat burr, a 48 mm conical burr and a 40 mm stainless conical burr cut coffee differently at the same gap, because the tooth pattern, the cutting angle and the distance a particle travels before it exits the burr set all differ. Two grinders set to the same physical gap will not produce the same distribution.

Second, the zero point. Zero is where the burrs touch, and it is set during assembly. Manufacturing tolerance, shim thickness and how the burr carrier was threaded on all shift it. Two units of the same model from the same production run can differ by several steps at the fine end, which is why owner forums are full of people reporting that their espresso setting is 4 while someone else's is 9 on identical hardware.

Third, the thread pitch of the adjustment. One click on a hand grinder with a published 8.8 micron per click figure moves the burrs a very different distance from one step on a 40 position stepped dial that has to cover cold brew as well as espresso. Even where two grinders both say "setting 10", the distance between 10 and 11 is not comparable.

The practical consequence: use micron ranges to know which neighbourhood you are aiming for, then find the setting by brewing and tasting. Copying a number from a video is the single most common reason a new grinder appears to be broken.

Where does espresso sit on named grinders?

The table below states what each manufacturer publishes about the adjustment scheme, and says plainly where a number cannot honestly be given. Stepless grinders have no factory scale at all, so there is nothing to publish and nothing to copy. Where a range is a widely reported starting point rather than a specification, the last column says so.

The Baratza Encore ESP Coffee Grinder is the usual first electric espresso grinder because its dial has genuine fine increments in the espresso half of the range rather than steps sized for drip. The MiiCoffee DF64 II and the Eureka Mignon Specialita are both stepless, which is the correct design for espresso and also the reason neither can give you a number to copy. On a stepless grinder the first job is to mark a reference point on the collar with a paint pen, so "a hair finer than my house setting" becomes a repeatable instruction rather than a feeling.

Among hand grinders, the TIMEMORE Chestnut C3 ESP Manual Coffee Grinder and the 1Zpresso J-Ultra both count clicks from a zero point, which is the most transferable scheme available because you can at least tell someone how many clicks off burr contact you are. The J-Ultra publishes a micron figure per click, which is unusual and genuinely useful. Even then, your zero and their zero are found by hand, so the count is a starting point rather than a recipe. Write your own click count on the bag and you have something a hand grinder can reproduce all week.

What does the wrong grind size look like in each brewer?

Grind is diagnosed by time and taste rather than by looking at the grounds. Every brewer has a target contact time, and the deviation from that time tells you which direction to move before you have tasted anything.

For espresso specifically, hold the dose and the yield fixed and let time be the readout. An 18 g dose pulled to 36 g should take 25 to 30 seconds. If it takes 18 seconds, grind finer. If it takes 45 seconds, grind coarser. Only once time is in the window does taste become the deciding signal, and at that point sour means finer still and bitter means coarser. The brew ratio chart gives the dose and yield pairs, and the extraction troubleshooting chart covers the faults that look like a grind problem but are not.

How does particle distribution matter as much as size?

A grinder does not produce one size, it produces a distribution around an average. Two grinders can share the same average particle size and taste completely different, because one produces a narrow band around that average and the other produces a wide spread of very fine dust and large boulders.

Fines are the particles far below the target size. They extract almost instantly and they migrate through the coffee bed, collecting at the bottom of the puck and restricting flow. A small quantity of fines contributes body and crema. A large quantity produces bitterness and unpredictable flow, which is exactly what a blade grinder or a worn burr set delivers. Boulders are the oversized particles. They barely extract at all in 27 seconds, so they contribute sourness and waste dose.

Conical burrs produce a wider, bimodal distribution with a distinct population of fines, which is generally read as more body and a more forgiving workflow. Flat burrs produce a narrower, more unimodal distribution, which is generally read as more clarity and separation of flavours, and which also exposes an uneven puck more brutally. The conical versus flat burr comparison works through where each one earns its money, and the grinder buying guide covers burr size, retention and motor speed together.

Why does the same setting drift over time?

Burrs wear. Steel burrs in a home grinder typically stay consistent for hundreds of kilograms of coffee, but the fine end drifts first, because a worn cutting edge tears rather than shears and produces more fines at the same gap. If your espresso setting has crept steadily coarser over two years to keep the same shot time, that is wear rather than imagination.

Retained grounds move the setting too. A grinder holding several grams of old coffee in its chute delivers a mixture of yesterday's grind and today's, so the first shot after a change is never a clean test. Purge two to three grams after any adjustment, or use a single dosing grinder with a near-zero retention path such as the Eureka Mignon Zero or the Baratza Sette 270 , whose straight through grind path was designed around exactly this problem.

Temperature has a smaller but real effect. A grinder run hard through six doses in a row warms its burrs, and warm burrs sit fractionally closer together while the coffee itself becomes more brittle. In a home setting this is a minor factor, but it is why the third flat white in a row can run faster than the first with nothing else changed.

Which grind settings should you write down?

Record four things per coffee: the grinder setting, the dose, the yield and the time. On a stepless grinder, record the position relative to a mark you made yourself rather than an absolute number. That log is what lets you start a new bag near the answer instead of at the factory default, and it is the difference between owning a grinder and negotiating with one every morning.

For filter methods, record the total brew time instead of a shot time. A V60 that drained in 2:10 at your usual setting is telling you the grind moved, the coffee aged or the pour changed, and that is worth knowing before you blame the beans. The dial-in guide lays out the shot-by-shot sequence for espresso. Grind quality sets the ceiling on what any machine can produce, so a recorded setting is worth more than an expensive brewer sitting next to an unrecorded one.