Brewing Calculation · All methods

Grind Size Reference Tool

Slide through seven grind levels to see particle size ranges, a tactile description and the brewers each level suits. The reference table can also be filtered by brewing method when you already know the device.

Tool

Grind coarseness Drag from extra fine (left) to extra coarse (right).

Filter the reference table by method

Grind	Particle size	Texture	Suited brewers

How It Works

Grind size controls the total surface area exposed to water and therefore the rate of extraction. Halving particle diameter roughly quadruples surface area, which is why a small grinder adjustment can change a cup dramatically. The reference uses particle size in microns as the shared language, because click numbers differ between every grinder model and say nothing to another brewer.

Each level pairs a micron band with a familiar tactile comparison — powdered sugar, table salt, sand, kosher salt — so the setting can be verified by touch when no measurement tools are available. Brewer recommendations follow the relationship between contact time and grind: short, pressurised contact needs fine particles, while long immersion needs coarse ones to avoid over-extraction and sediment.

Step-by-Step Usage Guide

Identify the brewer you plan to use and filter the table to it.
Drag the slider to the recommended level and read the micron range and texture description.
Grind a small amount and rub it between your fingers to compare against the description.
Brew, taste and adjust: grind finer for sour and weak cups, coarser for bitter and drying cups.
Record the grinder setting that worked alongside the bean name so the result can be repeated.

Frequently Asked Questions

Can I use one grind setting for everything?+

Not effectively. Contact time varies from 25 seconds for espresso to 24 hours for cold brew, and grind size is the main lever that keeps extraction in range across that span.

Do blade grinders work for specialty coffee?+

They chop unevenly and produce a wide particle distribution, which extracts unevenly. A hand burr grinder is the single most valuable upgrade for a home setup.

Why does my cup taste both sour and bitter?+

That is the classic signature of uneven grinding: fines over-extract while boulders under-extract. Sieving out fines or upgrading burrs is more effective than changing the setting.

Does grind size need to change as beans age?+

Slightly. Older beans have released their CO2 and extract a little more slowly, so grinding one step finer after three weeks often restores sweetness.

Applicable Scenarios

Reach for this reference when setting up a new grinder, when a recipe specifies a grind you cannot picture, or when moving between brewers over a weekend of tasting. It is also a practical teaching aid: describing a grind as 950 microns is unambiguous, while calling it 'medium' means different things on different equipment.