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Grinder conversion

1Zpresso J-Ultra to Breville Smart Grinder Pro

A V60 grind of about 2.2.8 on a 1Zpresso J-Ultra is roughly 35 on a Breville Smart Grinder Pro. Both land near 560 µm, a medium-fine grind.

1Zpresso J-Ultra2.2.8V60 setting
Breville Smart Grinder Pro35V60 setting
Particle size ~560 µmGrind Medium-fine

Settings by brew method

Brew method1Zpresso J-UltraBreville Smart Grinder Pro
Espresso~250 µm1.0.26
Moka pot~350 µm1.4.215
AeroPress~450 µm1.8.325
V60~560 µm2.2.835
Chemex~700 µm2.8.549
French press~900 µm3.6.668
Kalita Wave~600 µm2.4.439
Cold brew~1100 µm4.4.787
Siphon~650 µm2.6.444

Both grinders are mapped to one particle-size scale, fitted from the Honest Coffee Guide's per-method charts. It is not manufacturer burr-gap data, so treat this as a starting point and adjust by taste.

Go the other way

More about these grinders

Questions

Is 2.2.8 on a 1Zpresso J-Ultra the same as 2.2.8 on a Breville Smart Grinder Pro?

No. The two grinders count in different steps, so the same number gives a different grind. 2.2.8 on the 1Zpresso J-Ultra matches about 35 on the Breville Smart Grinder Pro.

How accurate is this conversion?

It is a starting point. Both grinders are mapped to particle size in microns, fitted from the Honest Coffee Guide charts for each brew method, not from manufacturer burr-gap specs. Beans, roast and burr wear change the result, so adjust by taste.

The coffee tastes sour or bitter after converting. What should I change?

Sour and thin: grind finer by a step or two. Bitter and harsh: grind coarser. Change one thing at a time.

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