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  3. Kinu M47 Classic to 1Zpresso J-Ultra

Grinder conversion

Kinu M47 Classic to 1Zpresso J-Ultra

A V60 grind of about 3.4 on a Kinu M47 Classic is roughly 2.2.8 on a 1Zpresso J-Ultra. Both land near 560 µm, a medium-fine grind.

Kinu M47 Classic3.4V60 setting
1Zpresso J-Ultra2.2.8V60 setting
Particle size ~560 µmGrind Medium-fine

Settings by brew method

Brew methodKinu M47 Classic1Zpresso J-Ultra
Espresso~250 µm1.51.0.2
Moka pot~350 µm2.11.4.2
AeroPress~450 µm2.71.8.3
V60~560 µm3.42.2.8
Chemex~700 µm4.32.8.5
French press~900 µm5.53.6.6
Kalita Wave~600 µm3.62.4.4
Cold brew~1100 µm6.74.4.7
Siphon~650 µm3.92.6.4

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 3.4 on a Kinu M47 Classic the same as 3.4 on a 1Zpresso J-Ultra?

No. The two grinders count in different steps, so the same number gives a different grind. 3.4 on the Kinu M47 Classic matches about 2.2.8 on the 1Zpresso J-Ultra.

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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