Question 1

Is 1.5.1 on a 1Zpresso X-Ultra the same as 1.5.1 on a 1Zpresso JX-Pro?

Accepted Answer

No. The two grinders count in different steps, so the same number gives a different grind. 1.5.1 on the 1Zpresso X-Ultra matches about 3.0.2 on the 1Zpresso JX-Pro.

Question 2

How accurate is this conversion?

Accepted Answer

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.

Question 3

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

Accepted Answer

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

Brew method	1Zpresso X-Ultra	1Zpresso JX-Pro
Espresso~250 µm	0.5.0	1.3.3
Moka pot~350 µm	1.0.9	1.9.1
AeroPress~450 µm	1.2.9	2.4.2
V60~560 µm	1.5.1	3.0.2
Chemex~700 µm	2.1.9	3.8.1
French press~900 µm	2.5.9	4.9.0
Kalita Wave~600 µm	1.5.9	3.2.3
Cold brew~1100 µm	3.3.8	6.0.0
Siphon~650 µm	2.0.9	3.5.2

1Zpresso X-Ultra to 1Zpresso JX-Pro

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