Grind size

Grind size describes the average particle size coffee ends up at after grinding, ranging from a fine powder for espresso to a coarse, salt-like texture for cold brew and French press. Each brewing method is built around a specific contact time between water and coffee, and grind size is what controls how fast or slow that extraction happens.

Finer grounds have more surface area, so water extracts flavor from them quickly, which is why espresso uses a fine grind but only takes twenty five to thirty seconds to brew. Coarser grounds expose less surface area, so methods like French press or cold brew that steep for minutes or hours need a coarse grind to avoid pulling out too much and tasting bitter or muddy.

When dialing in grind size, change only one brew at a time and taste before adjusting again, since it can take a few tries to find the right setting on a new grinder. A common mistake is using the same grind for every method, or blaming beans for a sour or bitter cup when the real fix is a slightly finer or coarser grind.