Coffee Grind Size Guide: Find the Right Grind | Bean Block

Why Grind Size Is the One Thing Most Home Brewers Get Wrong

If your coffee tastes bitter, sour, weak, or "off" — before you blame the beans, check your grind size first.

Grind size controls how fast water passes through the coffee and how much flavor gets extracted. Too fine for your brew method, and the water can't move through fast enough you get over-extraction, which tastes bitter and harsh. Too coarse, and water rushes through too quickly, you get under-extraction, which tastes sour, thin, or weak.

The good news: once you match your grind size to your brewing method, most "bad coffee" problems disappear  even with the exact same beans.

This guide breaks down the correct grind size for every major brewing method, plus which Bean Block beans work best for each one.

Brew Method	Grind Size	Texture Comparison	Brew Time
Cold Brew	Extra Coarse	Peppercorns	12–24 hrs
French Press	Coarse	Sea salt	4 min
Drip Coffee Maker	Medium	Sand	4–6 min
Pour-Over	Medium	Sand	2–4 min
AeroPress	Medium-Fine	Fine sand	1–2 min
Moka Pot	Fine	Table salt	4–5 min
Espresso	Extra Fine	Powdered sugar	25–30 sec

 

Grind Size by Brewing Method

1. French Press — Coarse Grind

French press uses full immersion with no paper filter, so the grind needs to be coarse enough that fine particles don't slip through the metal mesh into your cup that's what causes gritty, muddy French press coffee.

What it should look like: Chunky, like coarse sea salt.

Common mistake: Grinding too fine, which causes sediment and over-extraction (bitterness).

Recommended Bean Block beans: Mountain Summit; its bold, full-bodied profile holds up well to French press's heavier extraction style.

 

2. Drip Coffee Maker — Medium Grind

This is the most common brewing method for Filipino households, and also the one where the wrong grind size is most often blamed on "bad beans."

What it should look like: Like granulated sand not powdery, not chunky.

Common mistake: Using a grind that's too fine (leftover from an espresso setting) causes clogging and bitter, over-extracted coffee. Too coarse and the coffee tastes weak no matter how much you use.

Recommended Bean Block beans: Brazil Santos or Smooth Highlands, both are smooth, low-acidity profiles built for everyday drip brewing.

3. Pour-Over — Medium Grind (Slightly Finer Than Drip)

Pour-over gives you more manual control, so the ideal grind sits close to drip but can be adjusted slightly finer or coarser depending on how fast your water is flowing through.

What it should look like: Sand-like, similar to drip, but you can go slightly finer if your pour-over drains too fast.

Common mistake: Not adjusting grind size when switching brewers every pour-over cone (V60, Kalita, etc.) drains at a different rate.

Recommended Bean Block beans: Ethiopia Sidamo or Rwanda Inzovu Supreme, pour-over is the best method for showcasing bright, complex flavor notes.

4. AeroPress — Medium-Fine Grind

AeroPress is flexible — brew time is short and pressure-assisted, so it needs a slightly finer grind than pour-over to extract properly in that shorter window.

What it should look like: Between sand and table salt — finer than drip, coarser than espresso.

Common mistake: Using a drip-level grind, which under-extracts because AeroPress brew times are so short.

Recommended Bean Block beans: Colombia Supremo — balanced enough to work well across AeroPress's flexible recipes.

5. Moka Pot — Fine Grind

Moka pot uses pressure from steam, similar in spirit to espresso but gentler — so the grind needs to be fine, but not as fine as true espresso.

What it should look like: Like table salt.

Common mistake: Using an espresso-fine grind, which can clog the moka pot and cause pressure buildup.

Recommended Bean Block beans: Vietnam Arabica Dark — its bold profile suits moka pot's concentrated, espresso-like output.

 

6. Espresso — Extra Fine Grind

Espresso pushes hot water through the grounds at high pressure in under 30 seconds, so it needs the finest grind of any method to create enough resistance for proper extraction.

What it should look like: Powdery, like flour or powdered sugar.

Common mistake: This is the most sensitive grind setting — even a small change affects shot time significantly. If your shot pulls too fast (under 20 seconds), grind finer. Too slow (over 35 seconds), grind coarser.

Recommended Bean Block beans: Colombia Supremo or Brazil Santos — both hold up well under pressure brewing and pair well with milk.

7. Cold Brew — Extra Coarse Grind

Cold brew steeps for 12–24 hours instead of using heat, so it needs the coarsest grind of all methods — otherwise the extended steep time over-extracts and turns bitter.

What it should look like: Chunkier than French press — closer to peppercorns.

Common mistake: Using a French press grind for cold brew — it's close, but cold brew benefits from going slightly coarser given the much longer steep time.

Recommended Bean Block beans: Vietnam Arabica Medium or Mountain Summit — both hold sweetness and body well over a long cold steep.

What Happens When Your Grind Size Is Wrong