Coffee Grinding Guide: The Right Grind for Every Brewing Method (SCA and WBC Standards)

Grind size is the most underestimated variable in home coffee preparation, yet it is the one that most influences the final cup. Getting it right results in a balanced, sweet, and "clean" coffee. Getting it wrong turns the same beans into something sour, bitter, or thin-bodied. This guide explains what grind size actually does, presents a practical table by preparation method, and bases each recommendation on the practices of the Specialty Coffee Association (SCA) and the World Barista Championship (WBC).

At Asante Boutique Coffee Roasters, we sell most of our coffee as whole beans precisely because grind size is so crucial: ground coffee starts losing aromas within minutes, and the ideal grind size depends entirely on how you prepare it. This guide is our way of helping you protect the effort we put into roasting.

What Grind Size Actually Controls

Grinding increases the surface area of coffee exposed to water. The finer the grind, the greater the surface area and the faster the water extracts soluble compounds that carry flavor, sweetness, acidity, and body.

·     Too fine for the method means the water passes through slowly and over-extracts. The result is over-extraction: bitterness, dryness, and a harsh finish.

·     Too coarse for the method means the water passes through too quickly and under-extracts. The result is under-extraction: sour acidity, lack of body, and a salty or empty taste.

The goal is never a single "correct" fineness. It's about adjusting the grind size to the contact time and pressure of the chosen method, so that extraction falls within the balanced zone.

Grind Reference Chart by Method

The particle sizes below are approximate values, in micrometers (µm). Burr grinders produce a much more consistent particle distribution than blade grinders, and consistency is as important as average size.

See this accessory.

Brewing method	Grind level	Tactile reference	Approx. particle size
Turkish coffee / ibrik	Extra-fine	Powdered sugar / flour	~ 100–200 µm
Espresso	Fine	Fine sand / table salt	~ 250–350 µm
Moka pot	Fine–medium	Slightly coarser than espresso	~ 350–500 µm
AeroPress (short infusion)	Medium-fine	Fine sand	~ 450–700 µm
V60 / pour over	Medium-fine	Fine to regular sand	~ 750–950 µm
Flat-bottom filter / batch brew	Medium	Regular sand	~ 950–1100 µm
Chemex	Medium-coarse	Coarse sand	~ 1000–1100 µm
French press / cupping	Coarse	Rock salt / breadcrumbs	~ 1100–1200 µm
Cold brew	Extra coarse	Peppercorns	~ 1200 µm+

 

How SCA and WBC standards support these values

SCA cupping protocol. When professionals evaluate a coffee, they standardise the grind so that the results are comparable. The SCA cupping standard requires a grind where about 70–75% of particles pass through a US #20 sieve (0.85 mm / 850 µm) — a medium-coarse grind, deliberately set in a tolerant and repeatable zone. This is why "cupping grind" and "French press grind" are close in the table.

SCA extraction control. For filter coffee, the SCA guidance aims for an extraction yield of about 18–22% of the coffee mass dissolved in the cup. Grind is the primary lever to move within this window: finer to increase extraction, coarser to decrease it.

Espresso at the World Barista Championship. WBC competitors fine-tune espresso to a fine grind and evaluate the result by balance, sweetness, and clarity, not by a fixed micron number. The takeaway is the principle, not the number: with espresso fineness, small adjustments produce big changes in flavour, so adjust in minimal increments and taste after each change.

A simple method to fine-tune any preparation

1.    Start in the right zone. Use the table above to stay within your method’s range.

1.    Prepare and taste honestly. Sour, watery, or salty indicates under-extraction. Bitter, dry, or harsh indicates over-extraction.

2.    Adjust the grind, not everything at once. If it’s sour, grind finer. If it’s bitter, grind coarser. Change one variable at a time.

3.    Keep dose and water constant while adjusting, so you can attribute the change to the grind.

4.   Re-tune with each new coffee. Bean density, process, and roast level alter the ideal grind. A lighter, denser coffee often needs a finer grind than a darker one.

Why a consistent grinder matters more than an expensive one

A burr grinder grinds beans to a uniform size between two abrasive surfaces. A blade grinder chops randomly, producing both powder and boulders from the same batch. This mixture ensures simultaneous over-extraction and under-extraction in every cup, no matter how good the beans or how careful the preparation. If you invest in a single piece of equipment, make it a good burr grinder.

 

Frequently asked questions

What is the best grind for a V60 or pour over?

A medium-fine grind, about 750–900 µm — close to fine sand. If the brew flows too fast and tastes weak, grind a little finer; if it stalls and tastes bitter, grind coarser.

Can I use the same grind for espresso and filter?

No. Espresso needs a fine grind (~250–350 µm) to create resistance to pressure, while filter methods need medium to coarse grinds. Using the same for both will either over-extract the filter or choke the espresso.

How coarse should the grind be for cold brew?

Extra coarse, roughly the size of peppercorns (1200 µm and above). The long steeping time — typically 12 to 24 hours — makes a coarse grind essential to avoid severe over-extraction.

Why does my coffee taste sour?

Sour acidity usually indicates under-extraction. The most common solution is a finer grind, which increases extraction. Water that is too cold or too short a brewing time can also contribute.

How long after grinding should I brew?

As soon as possible. Ground coffee loses aromatic compounds within minutes of grinding, which is why we recommend buying whole bean coffee and grinding immediately before brewing.

 

The Asante perspective

Precision, knowledge, and transparency are the values by which we roast, and grinding is where they reach your kitchen. We will gladly recommend a grind setting for the specific coffee you bought from us and for the method you use at home — just ask. The beans have already been chosen and roasted with care; grinding is the final decision that protects all of that.