What grind setting should I use for cold brew on the Option-O Lagom P64?

Start at 8–9 for a light roast, 8.5–9.5 for a medium roast and 9–10 for a dark roast.

How long should I steep cold brew ground on the Option-O Lagom P64?

18–22 hours in the fridge for a light roast, 14–18 for medium and 10–14 for dark. On the counter it goes faster: 12–14, 9–12 and 7–9 hours.

What should the grounds look like?

Coarse. About the size of coarse sea salt for a light roast, coarse kosher salt for medium and raw sugar for dark.

Electric grinder

Cold brew grind setting for the Option-O Lagom P64

8–9

That is where to start with a light roast. It should come out looking like coarse sea salt. Medium roasts go to 8.5–9.5 and dark roasts to 9–10.

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Option-O Lagom P64, set for a light roast

The setting, by roast

Lighter roasts are harder to pull flavor out of, so they grind a little finer and steep longer. Darker roasts go the other way. The dial runs from 0 to 10.

Roast	Setting	Looks like	Steep in the fridge
Light roast	8–9	coarse sea salt	18–22 h
Medium roast	8.5–9.5	coarse kosher salt	14–18 h
Dark roast	9–10	raw sugar	10–14 h

Where the number comes from

People who own one report 7.5–10. Our starting point is 9 for a medium roast, and it moves with the roast.

Maker’s guidance: option-o.freshdesk.com

Owner reports: honestcoffeeguide.com, reddit.com

If you changed the burrs

Different burrs cut differently at the same number. Here is where each set starts.

Burr set	Light	Medium	Dark
Option-O Standard Steel 64mm	8–9	8.5–9.5	9–10
SSP High Uniformity (HU) 64mmStrong/intense body, espresso-focused, filter-capable; official chart groups it with the stock burr's espresso range.	8–9	8.5–9.5	9–10
SSP Unimodal (Multipurpose) 64mmHigh clarity, lower body; brew/filter-focused. The only burr set Option-O gives an official French Press (+9) reference for.	8–9	8.5–9.5	9–10
Mizen Omni 64mmNewer all-rounder burr; official pour-over/V60 point (+5-6) runs slightly coarser than the SSP Unimodal's (+4.5-5).	8–9	8.5–9.5	9–10

How to use it

Set it. Set the dial to 8–9. That is the light roast setting. Use the table above for anything darker.
Grind and look. You want pieces about the size of coarse sea salt.
Steep. Give it 18–22 hours in the fridge, or 12–14 on the counter.
Taste and adjust. Too bitter? Go coarser next time. Too sour? Go finer. Move about 1 at a time.

Let the app keep track.

Cold Brew Studio shows the dial created for your Option-O Lagom P64 with the setting marked, sizes the batch to your brewer, and moves the dial for you when you rate how it tasted.

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Free on iPhone and the web. No account needed.

Quick answers

What grind setting should I use for cold brew on the Option-O Lagom P64?: Start at 8–9 for a light roast, 8.5–9.5 for a medium roast and 9–10 for a dark roast.
How long should I steep cold brew ground on the Option-O Lagom P64?: 18–22 hours in the fridge for a light roast, 14–18 for medium and 10–14 for dark. On the counter it goes faster: 12–14, 9–12 and 7–9 hours.
What should the grounds look like?: Coarse. About the size of coarse sea salt for a light roast, coarse kosher salt for medium and raw sugar for dark.