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Chemex grind size

Chemex grind size on a Hario Skerton Pro

For Chemex on a Hario Skerton Pro, start at 4 clicks. That is about 700 µm, a medium grind.

Hario Skerton Pro setting for Chemex4 clicksMedium grind, ~700 µm
Finer 4 clicksCoarser 4 clicksStep size 150.5 µm

Adjusting from 4 clicks

WhenSettingParticle size
Finer: sour or thin cups4 clicks~718 µm
Start here4 clicks~700 µm
Coarser: bitter or dry cups4 clicks~778 µm

Lower numbers are finer. To grind finer, turn the setting down. Change one step at a time, and brew again before changing anything else.

Starting recipe for Chemex

Steps

  1. Rinse the thick filter well and dump the water.
  2. Add 30 g of medium-coarse coffee.
  3. Pour 60 g, wait 45 seconds, then pour slowly to 480 g by about 2:30.
  4. Let it drain. Total time is around 4:00 to 4:30.
  5. Taste. Sour: grind a little finer. Bitter or muddy: grind coarser.

Other brew methods on a Hario Skerton Pro

Chemex on other grinders

Questions

What grind setting is best for Chemex on a Hario Skerton Pro?

Start at 4 clicks and adjust by taste. Lower numbers are finer. To grind finer, turn the setting down.

How do I know if I should grind finer or coarser?

Fast and sour: grind finer by a step or two. Slow and bitter: grind coarser.

Where does this setting come from?

The Hario Skerton Pro is mapped to particle size in microns, fitted from the Honest Coffee Guide's settings for this grinder. It is a starting point, not a guarantee.