What grind size should I use?

Grind size is one of the biggest levers you have over how your coffee tastes, and the right setting depends almost entirely on your brew method. The rule of thumb: the longer water sits with the grounds, the coarser you grind. Quick methods need a finer grind so the water has enough surface area to pull out flavour in the short time it has.

A starting point by method

These are good first settings. Think of them as where to begin, not the final answer.

• Cold brew and French press: coarse, like coarse sea salt. Long steep times mean a coarse grind avoids a muddy, over-steeped cup.
• Pour-over and drip: medium, like table salt or beach sand. This is the everyday middle ground for V60, Chemex, and most drip machines.
• AeroPress: medium to medium-fine, depending on your recipe and steep time.
• Moka pot: fine, but a touch coarser than espresso.
• Espresso: fine, like powdered sugar or flour. The high pressure and very short contact time demand it.

The full visual reference is in the grind-size-guide.

Why it matters so much

Grind controls how fast water can extract flavour. Grind too coarse and water rushes through, leaving you with a weak, sour cup (under-extraction). Grind too fine for your method and water struggles through, over-doing it into harsh bitterness (over-extraction). Grind is one of the-four-dials alongside ratio, temperature, and time.

Fine-tune by taste, and mind your grinder

Once you are in the right zone, let your tongue lead:

• Sour, weak, or thin? Grind a little finer.
• Bitter, harsh, or hollow? Grind a little coarser.

Change one notch at a time so you can tell what helped. The deeper logic is in extraction-theory and the practical fix guide sour-vs-bitter.

One honest caveat: a blade grinder makes inconsistent particles that fight you no matter the setting. A burr grinder gives you uniform size and real, repeatable control. See burr-vs-blade if you are deciding what to buy.