Question 1

Is 3.0.2 on a 1Zpresso JX-Pro the same as 3.0.2 on a Option-O Lagom P64?

Accepted Answer

No. The two grinders count in different steps, so the same number gives a different grind. 3.0.2 on the 1Zpresso JX-Pro matches about 3.2 on the Option-O Lagom P64.

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 JX-Pro	Option-O Lagom P64
Espresso~250 µm	1.3.3	0.1
Moka pot~350 µm	1.9.1	1.1
AeroPress~450 µm	2.4.2	2.1
V60~560 µm	3.0.2	3.2
Chemex~700 µm	3.8.1	4.6
French press~900 µm	4.9.0	6.6
Kalita Wave~600 µm	3.2.3	3.6
Cold brew~1100 µm	6.0.0	8.6
Siphon~650 µm	3.5.2	4.1

1Zpresso JX-Pro to Option-O Lagom P64

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