Grinder setting converter.
You found a recipe written for a grinder you do not own. This maps that setting onto yours — through the same two-anchor universal scale the app uses, across all 18 supported grinders.
How the conversion works
There is no direct formula between two grinders, because a click on one is not a click on the other. What there is, for each grinder, is two reasonably well-documented reference points: where espresso sits on its dial, and where French press sits. Fix those two and you have a line — a mapping between that grinder's dial and a shared 1–10 scale.
Converting is then two steps. Read the source setting onto the universal scale, then read the universal value back down onto the target dial, quantised to the step the target can actually resolve. Every number this tool produces carries a ± band for the same reason the grind charts do — one step of the target dial is the honest resolution of the answer.
What it cannot know
This is an interpolation between two documented points, not a measurement. It does not know your burr wear, your unit's zero point, or whether your burrs are stock. Three things break it outright:
- Modified burrs. An SSP or third-party burr set changes the particle distribution at any given gap, so the published anchors no longer describe the machine. The number will be wrong and there is no correction factor that fixes it — you have to re-anchor from your own dial positions.
- Accessories that change click size. A Comandante with Red Clix has roughly half the click size it left the factory with, which roughly doubles every number.
- Stepless dials that have been reassembled. On a DF64 or Niche the zero point is set by hand. Two units genuinely disagree about what "20" means.
Treat the output as a starting point, brew, and let taste move you from there. The dial-in guide covers which direction to move and by how much.
Coffee Aeye does this conversion on every recipe automatically — every brew you open shows the grind in your grinder's numbers, not the recipe author's. Calibrate your own two anchors once and the whole library re-derives around your machine. Rate a brew and it tells you how many clicks to move, which direction, on your dial. Get it on Google Play — €4.29, one-time.