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Grind Size

How finely or coarsely your coffee beans are ground. This dramatically affects extraction speed and is the hardest variable to master.

Minimum

1 scale (1 = espresso, 10 = cold brew)

Optimal

5 scale (1 = espresso, 10 = cold brew)

Maximum

10 scale (1 = espresso, 10 = cold brew)

Difficulty

Very difficult

How It Affects Your Coffee

Finer grind = more surface area = faster extraction. Going from coarse to fine can double extraction.

Too fine → bitter, muddy, over-extracted. Too coarse → sour, weak, under-extracted.

Very difficult - requires good grinder and practice. Most impactful variable after dose.

•Visual guide: Fine = salt, Medium = sand, Coarse = breadcrumbs
•Aeropress optimal: Between table salt and beach sand (medium-fine)
•If coffee is sour/weak: grind finer. If bitter/harsh: grind coarser.
•Blade grinders create inconsistent particles - upgrade to burr grinder (₹3000+)
•Grind fresh before brewing - ground coffee stales in 15 minutes
•Different grinders produce different particles at same setting - adjust by taste

✗Using espresso-fine grind for Aeropress - you'll get 5+ minutes press time and bitter coffee
✗Using French Press coarse grind for Aeropress - sour, weak, under-extracted
✗Not adjusting grind when changing other variables (if you increase temp, grind slightly coarser)
✗Grinding all beans at once and storing - coffee goes stale quickly
✗Thinking blade grinder is "fine" - it creates dusty fines that cause bitterness

Medium-fine (sugar-like). Finer than pour-over, coarser than espresso. Should take 20-40 seconds to press.

Coarse (breadcrumb-like). Too fine causes muddy, silty coffee with grounds in cup.

Medium (sand-like). Slightly coarser than Aeropress. Aim for 2:30-3:30 total brew time.

Experiment with grind size in real-time and see how it affects your coffee taste profile.

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Phase 1.1 Feature

These variables interact with grind size:

Variables Learned1 / 8

🚀 Complete all 8 variable pages to unlock advanced simulators in Phase 1.1!