Grind size controls how fast water extracts flavor from coffee. Finer grounds have more surface area and extract quickly; coarser grounds extract slowly. Match the grind to your brewer’s contact time and you’re most of the way to a great cup.
The seven grind levels
Extra coarse (peppercorns) suits cold brew’s 16-hour steep. Coarse (sea salt) is for French press. Medium-coarse (rough sand) fits Chemex. Medium (sand) is the drip machine standard. Medium-fine works for pour over cones and AeroPress. Fine (table salt) is espresso and moka pot territory. Extra fine (powder) is only for Turkish coffee.
The touch test
No two grinders use the same numbers, so calibrate by feel: pinch a few grounds between your fingers and compare against the textures above. Your grinder’s “setting 12” means nothing; “feels like sea salt” always means the same thing.
Troubleshooting with grind size
Bitter, harsh, or drying? You’re over-extracting — go coarser. Sour, thin, or weak? Under-extracting — go finer. Adjust one step at a time and keep everything else constant.
Why grinder quality matters more than settings
A blade grinder produces dust and boulders in the same batch, so part of your brew over-extracts while the rest under-extracts — bitter and sour in the same sip, and no setting can fix it. Any burr grinder solves this. See our printable grind chart for the full reference.
