Of everything we test — kettles, grinders, drippers, scales — grind size is the single lever that changes a cup the most, and it's free to adjust. This is the reference chart we actually use in our own testing.
The chart
| Brew method | Grind size | Texture comparison |
|---|---|---|
| Cold brew | Extra coarse | Cracked peppercorns |
| French press | Coarse | Breadcrumbs |
| Chemex | Medium-coarse | Coarse sand |
| Pour-over (V60, Kalita) | Medium | Table salt |
| Drip machine | Medium | Table salt |
| AeroPress | Medium-fine | Fine sand |
| Espresso | Fine | Powdered sugar |
| Turkish coffee | Extra fine | Flour |
Why grind size matters more than most gear
A $700 espresso machine with the wrong grind size produces a worse cup than a $30 setup with the right one. Grind size controls how fast water moves through the coffee and how much surface area is exposed — get it wrong in either direction and no amount of expensive equipment fixes it.
How to dial it in yourself
Start at the recommended grind size for your method, brew, and taste. If it tastes sour or weak, go one step finer next time. If it tastes bitter or harsh, go one step coarser. Change only one variable at a time — grind size, then ratio, then temperature — so you know what actually caused the difference.
Frequently asked questions
What happens if my grind is too coarse?
Water passes through too quickly, under-extracting the coffee. The result tastes thin, sour, and weak, even if you used plenty of grounds.
What happens if my grind is too fine?
Water moves through too slowly, over-extracting the coffee. The result tastes bitter and harsh, and in pour-over it often clogs the filter and stalls the brew entirely.