Coffee grind size guide: how fine or coarse to grind

Why does grind size matter?

Grind size is one of the most important variables in coffee brewing. It determines how quickly water extracts flavour from the coffee — finer grinds extract faster because water has more surface area to contact, while coarser grinds extract slower.

Using the wrong grind size leads to either under-extraction or over-extraction. Under-extracted coffee tastes sour, thin, and underdeveloped. Over-extracted coffee tastes bitter, harsh, and astringent. The right grind size for your brewer produces a balanced, sweet, flavourful cup.

Different brewing methods require different contact times between water and coffee, which is why each method has an optimal grind size range. Matching your grind to your brewer is essential for good coffee.

Fine grind: espresso and Moka pot

Fine grind resembles table salt or slightly finer. It's used for brewing methods with short contact times and pressure, primarily espresso and Moka pots (stovetop espresso makers).

For espresso, grind as fine as your grinder allows while still achieving a 25-35 second extraction. The grind needs to create enough resistance that pressurised water extracts flavour in this short window. Too coarse and shots run fast and sour; too fine and they choke or taste bitter.

Moka pot grind should be fine but not espresso-fine. Slightly coarser prevents over-extraction from the longer brew time. Turkish coffee is the exception — it requires an extra-fine, powdery grind.

Medium grind: pour-over and AeroPress

Medium grind resembles coarse sand and works for pour-over methods like V60, Chemex, and Kalita Wave, as well as drip coffee makers and AeroPress. These methods typically have brew times of 2-4 minutes.

For V60, start with a medium-fine grind (slightly finer than sand) and adjust based on brew time. If your brew finishes too fast and tastes sour, grind finer. If it's slow and bitter, grind coarser. Target a total brew time of 2:30-3:30 for a standard recipe.

AeroPress is versatile and works with various grind sizes depending on your recipe. Standard recipes use a medium grind with 1-2 minute steep times. Finer grinds suit shorter, more concentrated brews.

Coarse grind: French press and cold brew

Coarse grind resembles sea salt or coarse breadcrumbs. It's used for immersion brewing methods with longer contact times, including French press, cold brew, and cupping.

French press coffee steeps for about 4-5 minutes with full contact between grounds and water. A coarse grind prevents over-extraction during this time and makes filtering easier (fine particles clog the mesh filter and create muddy, bitter coffee).

Cold brew requires the coarsest grind because of its 12-24 hour steep time. Even with cold water, a finer grind would over-extract and produce harsh, bitter concentrate. Coarse grounds yield smooth, sweet cold brew.

Investing in a good grinder

A quality burr grinder is a great investment for improving your coffee at home. Blade grinders chop beans inconsistently, creating a mix of fine powder and large chunks that extract unevenly. Burr grinders crush beans between two surfaces, producing uniform particles.

Hand grinders can offer excellent results for filter coffee at reasonable prices. Electric burr grinders add convenience but cost more. For espresso, invest in a grinder specifically designed for fine grinding — filter grinders often lack the precision needed for espresso.

Grind immediately before brewing for the best results. Pre-ground coffee loses aromatics rapidly, so even a basic grinder will improve your coffee compared to buying pre-ground.