Espresso Grind Size Guide: Visual Chart & Settings

Espresso grind size is defined as the particle size distribution of coffee grounds specifically calibrated for espresso extraction. Espresso grind size is measured by micron size, with the ideal range falling between 250-400 microns for most espresso preparations. The grind size directly causes extraction rate changes, with finer grinds increasing surface area contact and coarser grinds reducing it.

Burr grinders are defined as grinding devices that use two abrasive surfaces (burrs) to crush coffee beans into uniform particles. Burr grinders are a type of precision coffee grinding equipment essential for espresso preparation. Conical burr grinders and flat burr grinders are types of burr grinder designs, with each producing slightly different particle distributions that affect espresso flavor profiles.

Grind consistency is defined as the uniformity of particle sizes within a coffee grind sample. Grind consistency is measured by the percentage of particles falling within the target micron range. Inconsistent grind size causes channeling, uneven extraction, and undesirable flavor compounds in the final espresso shot.

Espresso grind calibration is defined as the process of adjusting grinder settings to achieve optimal extraction parameters. Espresso grind calibration is measured by shot timing, visual extraction characteristics, and taste evaluation. If espresso grind size is too fine, shot timing exceeds 35 seconds and produces over-extracted, bitter flavors. If espresso grind size is too coarse, shot timing falls below 20 seconds and produces under-extracted, sour flavors.

Particle distribution is defined as the range of sizes present within a coffee grind sample. Particle distribution is a type of quality metric for grind consistency. A narrow particle distribution causes more even extraction, while a wide distribution causes uneven water flow through the coffee puck.