Grind charts say medium and leave it there, which is useless if you have never seen a reference. Medium grind is a physical texture you can identify with things already in your kitchen — and once you know it, drip coffee stops being a lottery.
What medium actually looks like
Medium grind for drip coffee is roughly the texture of coarse sand or fine sea salt. Individual particles are visible but small, and if you pinch a sample it holds together briefly before crumbling. It is not powder and it is not gravel.
The reference most people already own: table salt is close to medium-fine, coarse sea salt is medium, and raw sugar is medium-coarse. Drip sits on the coarse sea salt end of that scale.
| Reference | Approximate grind | Brew method |
|---|---|---|
| Flour | powder | Turkish |
| Fine sand | fine | Espresso |
| Table salt | medium-fine | AeroPress, moka pot |
| Coarse sea salt | medium | Drip, V60 |
| Raw sugar | medium-coarse | Chemex, flat-bottom pour over |
| Breadcrumbs | coarse | French press |
| Peppercorns | very coarse | Cold brew |
Diagnosing grind from taste
This is faster than looking. If the bed drains in under three minutes and the cup tastes sour, sharp or thin, the grind is too coarse — water ran past the coffee too fast to extract the sugars.
If the bed backs up, the brew takes more than seven minutes, and the cup tastes bitter or drying, the grind is too fine — the water could not pass, so it sat in contact and pulled out the harsh compounds.
Both problems look like 'bad coffee' and both get blamed on the beans. Change the grind one step at a time and taste between every adjustment.
- Sour + fast drain (<3 min) -> grind finer
- Bitter + slow drain (>7 min) -> grind coarser
- Balanced taste + 4-6 min -> grind is correct, adjust ratio instead
Pre-ground coffee
Supermarket pre-ground labelled 'drip' or 'filter' is correctly sized for a standard drip machine. If you are using a drip machine and pre-ground coffee, grind size is not your problem — ratio and water quality are.
It goes stale in about two weeks after opening, faster than whole beans. Store it sealed, in the dark, and buy smaller bags. Grind size matters less than freshness at this level.
Why the number on your grinder means nothing
A setting of 6 on one grinder is not the same particle size as 6 on another. Even within one brand, burr wear shifts the calibration over months. The number is a bookmark for your own machine, not a universal measurement.
So: find the setting that gives coarse-sea-salt texture on your grinder, write it down, and use that as your drip reference. Recheck it every few months if you grind daily.
Water and temperature matter as much
A correct grind with 95C water and hard tap water still makes a bitter cup. Target 92 to 96C at the brew head and water with 50 to 150 ppm total hardness. If your tap water is very hard, filtered water improves drip coffee more than any grind adjustment.