The best coffee in the world, prepared with the wrong grind, tastes bland. This is not an exaggeration — it is one of the most frustrating realities of specialty coffee.
Grind is probably the most important variable in coffee preparation, and at the same time the least understood. Water temperature, coffee-to-water ratio, extraction time — all matter. But none define the final flavor with as much authority as the size of the coffee particles you put in contact with water.
This is the visual guide to understanding what grind you need according to your method.
What is particle size and why does it matter?
Particle size — the average size of ground coffee particles — controls two things: the surface area exposed to water and the extraction speed.
- Finer grind = more exposed surface area = faster, more intense extraction.
- Coarser grind = less exposed surface area = slower, gentler extraction.
Each brewing method is designed to work with a specific particle size. If the grind is too fine for your method, the coffee will be over-extracted: bitter, astringent, flat. If it's too coarse, it will be under-extracted: watery, acidic, weak, lacking body. The correct grind is what allows you to extract the flavors coffee has to offer without overdoing it or falling short.
The 7 main grinds (visual reference)
From coarsest to finest, these are the grinds you need to know. Each has a familiar visual equivalent to help you identify it:
- Extra coarse — grains the size of sea salt or whole peppercorns. For cold brew and long infusions.
- Coarse — like kosher salt or coarse sugar. For French press.
- Medium-coarse — like coarse beach sand. For Chemex.
- Medium — like fine sand or regular sugar. For V60, Kalita Wave, electric drip.
- Medium-fine — like fine table salt. For AeroPress (standard method).
- Fine — like powdered sugar. For Italian moka pot.
- Very fine — like flour or talcum powder. For espresso.
Grind by method: exact guide
Cold brew — extra coarse grind
Cold brew extracts coffee cold for 12-24 hours. A coarse grind prevents over-extraction and bitterness, and allows for easy filtering afterwards.
- Grind: extra coarse, like sea salt
- Extraction time: 12-24 hours
- Green Hills recommendation: Natural Ground Coffee — the fruity notes of the natural process are extraordinary in cold brew.
French press — coarse grind
Coffee is submerged directly in water for 4 minutes. If the grind is too fine, the coffee passes through the mesh filter and produces abundant sediment, and over-extracts, producing bitterness.
- Grind: coarse, like kosher salt
- Extraction time: 4 minutes
- Green Hills recommendation: Honey Ground Coffee — the natural sweetness and body of the honey process shine in this method.
Chemex — medium-coarse grind
The thick paper filter of the Chemex makes water flow slower. It needs a grind that allows for this controlled flow without clogging it.
- Grind: medium-coarse, like coarse sand
- Extraction time: 4-5 minutes
- Green Hills recommendation: Tradition Ground Coffee — the washed process is expressed to its fullest with the cleanliness of the Chemex.
V60 and pour-over drippers — medium grind
The V60 has ribbed channels that speed up water flow. It requires a balanced grind that allows for uniform extraction in a shorter time than the Chemex.
- Grind: medium, like beach sand
- Extraction time: 2:30 to 3:30 minutes
- Green Hills recommendation: Silver Ground Coffee — the floral and tropical complexity shines with the clarity of the V60.
AeroPress — medium-fine grind
The AeroPress combines immersion with manual pressure in 1-2 minutes. A medium-fine grind allows for intense extraction without clogging the filter.
- Grind: medium-fine, like fine table salt
- Extraction time: 1-2 minutes
- Green Hills recommendation: Natural Ground Coffee — the pressure of the AeroPress amplifies the fruity notes of the natural process.
Italian moka pot — fine grind (but not as fine as espresso)
The moka pot works by steam pressure. It needs a fine grind, but slightly coarser than espresso grind, to avoid clogging and prevent over-extraction.
- Grind: fine, slightly coarser than espresso
- Extraction time: 4-5 minutes
- Green Hills recommendation: Tradition Ground Coffee — the classic for the classic Italian method.
Espresso — very fine grind
The espresso machine uses 9 bars of pressure to extract 30ml of coffee in 25-30 seconds. It requires the finest grind of all methods — and the most precise.
- Grind: very fine, like flour or talcum powder
- Extraction time: 25-30 seconds
- Green Hills recommendation: Gold Ground Coffee — the most exclusive coffee for the most demanding method.
Quick reference table
| Method | Grind | Visual comparison | Time |
|---|---|---|---|
| Cold brew | Extra coarse | Sea salt / peppercorns | 12-24 h |
| French press | Coarse | Kosher salt | 4 min |
| Chemex | Medium-coarse | Coarse sand | 4-5 min |
| V60 / Kalita | Medium | Beach sand | 2:30-3:30 min |
| AeroPress | Medium-fine | Fine table salt | 1-2 min |
| Italian moka pot | Fine | Powdered sugar | 4-5 min |
| Espresso | Very fine | Flour / talcum powder | 25-30 sec |
How to tell if your grind is wrong
Three clear signs of incorrect grind:
- Coffee too bitter and astringent: grind too fine for your method — over-extraction.
- Coffee watery, acidic, lacking body: grind too coarse — under-extraction.
- Water clogs the filter or drips too slowly: grind too fine and/or saturated filter.
If your coffee tastes bad but all other variables are fine, the grind is almost always the cause.
The problem with domestic grinders
Here's the problem almost no one mentions: mid-range domestic grinders have considerable particle size variance. A blade grinder — the most common and economical — produces particles of very different sizes in the same grind: a mix of fine powder and large chunks that no method extracts correctly.
To achieve precise and uniform grinds — especially for espresso or moka — you need a ceramic burr grinder or flat disc grinder, which costs between $400,000 and $1,500,000 COP.
The alternative: custom grinding calibrated by method
If your method is stable (always Chemex, always AeroPress, always French press), you don't need to invest in a premium grinder. You can order your coffee ground to order by method, with a professional calibration that your domestic grinder will hardly match.
At Green Hills, we do exactly that: you tell us your method when ordering, we calibrate the particle size with barista grinders, and vacuum pack it with a degassing valve on the same day. The difference is noticeable from the first cup.
Don't have a grinder or is yours not precise? Order your coffee custom ground, indicating your method. It will arrive calibrated exactly for your coffee maker, fresh and vacuum-packed.
