Grinding coffee correctly is one of the most important factors in brewing great coffee. Even the best beans can taste weak, sour, or bitter if the grind size isn’t right.

In this guide from Ascapart Coffee, we’ll explain the ideal grind size for every major brewing method and show you how to get the best flavour from your coffee at home.

Coffee Grind Size Chart

Different brewing methods require different grind sizes because they extract coffee at different speeds.

Using the correct grind size helps ensure your coffee extracts evenly and produces the best flavour.

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Why Grind Size Matters

Coffee brewing is all about extraction. When hot water passes through ground coffee, it dissolves flavours and oils from the beans.

If your grind size is wrong, the extraction will be uneven.

Too fine
Water flows slowly and extracts too much.
Result: bitter, harsh coffee.

Too coarse
Water flows too quickly and extracts too little.
Result: weak or sour coffee.

Finding the correct grind size allows water to extract the coffee evenly.

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Grind Size for Each Brewing Method

Espresso

Espresso requires a fine grind, similar to table salt.

Because espresso machines use high pressure and short brew times, the grind needs to be fine enough to slow down the water flow and extract flavour properly.

If your espresso shot runs too quickly, try grinding slightly finer.

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AeroPress

AeroPress works well with a medium-fine grind.

This grind size allows the coffee to extract quickly while still producing a smooth, balanced cup.

You can adjust the grind slightly depending on your brew time and recipe.

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Pour-Over (V60)

For pour-over brewing with the Hario V60 Coffee Dripper, a medium grind works best.

The texture should resemble coarse sand.

This allows the water to flow steadily through the coffee bed and produce a clean, balanced cup.

If your V60 brew finishes too quickly, try grinding slightly finer.

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Chemex

Chemex brewers use thicker filters, which slow down the brew.

Because of this, a medium-coarse grind is ideal.

This prevents over-extraction and keeps the cup clean and smooth.

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French Press

French Press brewing works best with a coarse grind, similar to sea salt.

A coarse grind prevents sediment from passing through the metal filter and keeps the brew smooth.

Grinding too fine for French press often leads to muddy, bitter coffee.

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Cold Brew

Cold brew requires an extra coarse grind.

Since cold brew extracts slowly over 12–24 hours, a coarse grind prevents the coffee from becoming overly bitter.

It also makes filtering the coffee easier.

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Blade Grinder vs Burr Grinder

For the best grind consistency, we always recommend using a burr grinder.

Blade grinders chop coffee unevenly, producing a mix of fine powder and large chunks. This leads to uneven extraction.

Burr grinders crush the coffee beans between two burrs, producing a much more consistent grind size.

Consistent grinding makes a noticeable difference in flavour.

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Common Coffee Grinding Mistakes

Grinding Coffee Too Far in Advance

Coffee begins to lose flavour quickly after grinding.

For the best taste, grind your coffee just before brewing.

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Using the Wrong Grind Size

Using espresso grind for French press or coarse grind for espresso will produce poor results.

Always adjust your grinder depending on the brewing method.

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Inconsistent Grind

If your coffee tastes both bitter and sour, your grind may be inconsistent.

This often happens with blade grinders or poorly calibrated grinders.

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Tips for Better Coffee at Home

• Use freshly roasted coffee
• Grind just before brewing
• Adjust grind size based on taste
• Use filtered water when possible

Small changes can dramatically improve your coffee.

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Final Thoughts

Getting the grind size right is one of the easiest ways to improve your coffee at home. Each brewing method extracts coffee differently, so adjusting the grind ensures you get the best flavour from every cup.

At Ascapart Coffee, we roast specialty coffees designed to shine across different brewing methods, from espresso to pour-over.

Experiment with grind size, brewing technique, and fresh coffee to discover the flavours you enjoy most. ☕