Grind Size Guide

Use a coarse grind, similar to sea salt or raw sugar. French press requires coarse grounds because the metal mesh filter cannot block fine particles. Too fine a grind will slip through the filter, creating a muddy, gritty cup and over-extracting into bitterness. Steep for 4 minutes with coarse grounds for a clean, full-bodied result.

Use a medium-fine grind, similar to table salt. For a V60, aim for slightly finer than medium. For a Chemex, go slightly coarser (medium-coarse) because the thick Chemex filters slow the flow. The target is a total brew time of 2.5 to 3.5 minutes. If the water drains too fast, grind finer. If it stalls, grind coarser.

Use a very fine grind, similar to powdered sugar or fine sand. Espresso requires the finest grind of any common brewing method because water passes through the puck in only 25-30 seconds under 9 bars of pressure. Small adjustments make a big difference. Move one notch finer if the shot runs fast and watery, one notch coarser if it chokes or tastes bitter.

Grind size is one of the biggest factors in how your coffee tastes. Finer grinds expose more surface area, causing water to extract flavor compounds faster, which can lead to bitterness if taken too far. Coarser grinds extract slower, which can result in sour, thin coffee if the brew time is too short. The right grind matches the contact time of your brewing method.

A burr grinder is significantly better for consistency. Burr grinders crush beans between two surfaces set at a fixed distance, producing uniform particles. Blade grinders chop randomly, creating a mix of dust and boulders that extracts unevenly. This means some particles over-extract (bitter) while others under-extract (sour) in the same cup. A budget burr grinder outperforms an expensive blade grinder.

Pre-ground coffee labeled "espresso" will work in a pinch, but the results will be inconsistent and mediocre. Espresso demands precise grind adjustments that change with humidity, bean age, and roast level. Pre-ground cannot be adjusted. It also goes stale within 15-30 minutes of grinding, losing the aromatics and crema potential that make espresso worth drinking. A dedicated espresso grinder is essential for good espresso.