Coffee grind size guide: matching grind to your brewer

If you change one thing to improve your coffee, make it the grind. Grind size controls how quickly water pulls flavour from the coffee — get it wrong and even great beans taste sour or bitter.

Why grind size matters

Finer grounds have more surface area, so water extracts faster; coarser grounds extract slower. Each brew method needs water in contact with the coffee for a certain time, so the grind has to match. Too fine for the method tastes bitter and harsh (over-extracted); too coarse tastes sour and weak (under-extracted).

Match grind to brewer

• Coarse (sea salt): French press, cold brew.
• Medium-coarse: Chemex, clever dripper.
• Medium: pour over (V60), South Indian filter, drip machines.
• Medium-fine: moka pot, AeroPress.
• Fine (table salt): espresso.
• Extra fine (powder): Turkish coffee.

Burr grinder vs blade grinder

A burr grinder produces uniform grounds and is worth the investment — even a basic hand grinder beats a blade grinder, which chops beans unevenly into a mix of dust and boulders that extract inconsistently. Uniformity is what makes a cup taste clean.

Dial it in by taste

Start with the recommended grind for your brewer, then adjust: if the coffee tastes sour or weak, grind finer; if it tastes bitter or harsh, grind coarser. Change one variable at a time and you'll quickly find the sweet spot.