Coffee Grind Size Chart: Matching Your Grind to Your Brewer

There are five or six things you can change about how you make coffee. Grind size is the one that moves the cup the most, and it's the one almost nobody adjusts. People buy a decent grinder, leave it on whatever number it shipped at, and then wonder why the coffee tastes sour on the drip machine and harsh in the espresso basket.

Here's the whole idea in one sentence: the longer water is in contact with coffee, the coarser the grind needs to be. Everything below follows from that.

Why grind size changes the taste

Grinding coffee is really about surface area. A coarse grind has less surface exposed to water, so water pulls flavor out of it slowly. A fine grind has enormously more surface, so it gives up its flavor fast.

That matters because the compounds in coffee don't come out all at once. Acids come first — the bright, fruity, sometimes sour ones. Sugars and the sweet, rounded flavors come next. The bitter compounds come last. A well-made cup stops somewhere in the middle of the third phase.

So if your grind is too coarse for your brewer, water runs through before the sugars come out, and you're left with the acids: thin, sour, watery. If your grind is too fine, water lingers and drags out the bitter end: harsh, drying, ashy. Same beans, same water, completely different drink.

The chart

Pinch the grounds between your fingers. That's a more reliable check than any grinder's number, because no two grinders agree on what "6" means.

Reading your cup and moving one step

You don't need a refractometer. You need to taste the coffee and answer one question: is it under or over?

• Sour, thin, tastes like it stopped early — under-extracted. Grind finer. Or brew a little longer, or use hotter water.
• Harsh, bitter, dry on the back of the tongue — over-extracted. Grind coarser. Or shorten the brew, or drop the water temperature a few degrees.
• Weak but not sour — that's a ratio problem, not a grind problem. Use more coffee.
• Bitter and weak at once — also usually ratio: too little coffee stretched over too much water for too long.

Move one or two clicks at a time and change one variable per brew. If you change the grind and the temperature together, you learn nothing about either.

The pour over drawdown trick

Pour over gives you a free diagnostic that no other method does: time how long the water takes to drain.

For a normal V60 brew with about 22 grams of coffee, you want the bed to be dry at somewhere around three minutes. Much past four and your grind is too fine — the water is stalling. Under two and a half and it's too coarse — the water is falling straight through. You can diagnose this from across the kitchen, without tasting anything.

A word on blade grinders

If you're using a blade grinder — the kind with a spinning propeller — none of the above will work reliably, because a blade grinder doesn't produce a grind size. It produces a chaotic mix of dust and boulders, and the dust over-extracts while the boulders under-extract, in the same cup, at the same time. That's why blade-ground coffee so often tastes bitter and sour.

A cheap hand-cranked burr grinder outperforms an expensive blade grinder. If you're going to buy one thing for your coffee this year, buy that.

Or just let us grind it

If you don't own a grinder and don't want one, that's a completely reasonable position. Every coffee we sell lets you pick your brew method at checkout — whole bean, coffee maker, pour over, French press, espresso, Aeropress, or cold brew — and we grind it to match before the bag is sealed.

You'll lose some aroma compared to grinding at home, because ground coffee starts giving up volatiles within minutes. But a correctly sized grind that's a week old beats a wrong-sized grind that's thirty seconds old, every time. Get the size right first; worry about the freshness gap second.

Not sure which grind matches how you actually brew in the morning? Take the quiz — it asks about your setup and picks the grind and the roast for you. Or start with the Honduras Reserva Pacavita, which is forgiving enough to survive your first few adjustments.