Grind size

Definition

Grind size is the particle-size distribution leaving the burrs. Converters estimate mean size as clicks × microns per click from burr lock or a published zero. That is a relative map, not a laser diffraction lab. Finer grind extracts faster and chokes espresso; coarser grind under-extracts and races through a puck. Match size to brew method, then taste — clicks are not universal between brands.

Calculators that use this

• Grind size & dialing in

  Grind Size Converter

  Convert grinder clicks between machines into estimated microns and whether that setting looks like espresso or filter. A map, not a laser diffraction lab.

• Grind size & dialing in

  Espresso Dial-In Calculator

  From dose, yield, time and a sour–bitter taste call, get a suggested yield, grind direction and a time hint. Taste first; the numbers follow.