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# Grind size: the setting that changes everything
- URL: https://syllabus.ghost-themes.apps.codememory.com/grind-size/
- Published: 2026-09-08T09:00:00.000Z
- Updated: 2026-09-08T09:00:00.000Z
- Description: Extraction in plain words, why burrs beat blades and a simple way to dial in.
- Author: Marco Bellini
- Tags: Coffee at Home, #chapter The basics, #Import 2026-09-30 07:57

If you change only one thing about how you make coffee, change how you grind it. Grind size controls how fast water pulls flavour out of the coffee, and that decides whether your cup tastes sour, bitter or just right. This lesson explains extraction in plain words and gives you a simple method to find the right setting.

![Coffee ground for a pour-over: like coarse sand.](https://syllabus.ghost-themes.apps.codememory.com/content/images/2026/09/grind-ground-1.jpg)

Coffee ground for a pour-over: like coarse sand.

## Extraction in one paragraph

When hot water meets ground coffee, it dissolves flavour compounds. The acids dissolve first, then the sugars, and last the bitter compounds. If you stop too early, the cup is **under-extracted**: sour, thin and salty. If you go too far, it is **over-extracted**: bitter, dry and hollow. The sweet spot is in between, and grind size is your main control.

## Why size matters

Smaller particles have more surface area, so water extracts them faster. A fine grind extracts quickly; a coarse grind extracts slowly. Each brewing method has a contact time, so each needs a different grind:

| Method    | Contact time  | Grind       | Looks like             |
| --------- | ------------- | ----------- | ---------------------- |
| Espresso  | 25–30 seconds | Very fine   | Flour, slightly gritty |
| Moka pot  | 3–5 minutes   | Fine        | Table salt             |
| Pour-over | 2.5–4 minutes | Medium-fine | Coarse sand            |
| Cafetière | 4 minutes     | Coarse      | Sea salt               |
| Cold brew | 12–18 hours   | Very coarse | Cracked pepper         |

![A hand grinder with good burrs costs less than most electric ones.](https://syllabus.ghost-themes.apps.codememory.com/content/images/2026/09/grind-hand-1.jpg)

A hand grinder with good burrs costs less than most electric ones.

## Blades or burrs?

Blade grinders chop coffee with a spinning blade. They make a mix of dust and chunks, and the dust over-extracts while the chunks under-extract. The cup tastes bitter and sour at the same time.

Burr grinders crush coffee between two rough surfaces set a fixed distance apart. The particles are much more even, and you can repeat the same setting every day. A basic burr grinder, even a hand grinder, is the single best upgrade for home coffee.

💡

No burr grinder yet? Ask your roaster to grind the beans for your method, buy small bags and keep them sealed.

## Dialling in: a simple method

"Dialling in" means adjusting the grind until the coffee tastes right. Change one thing at a time and keep everything else the same: the same dose, the same water and the same time.

1. Start at the grind your method needs, from the table above.
2. Brew and taste. Write down the setting.
3. **Sour, sharp or thin?** Grind finer next time.
4. **Bitter, dry or harsh?** Grind coarser next time.
5. Adjust in small steps until the cup is sweet and balanced.

Also watch the brew time. If your pour-over drains in under two minutes, the grind is probably too coarse. If it takes more than five, it is probably too fine.

![Weigh your dose: a scoop can vary by 30%.](https://syllabus.ghost-themes.apps.codememory.com/content/images/2026/09/grind-spoon-1.jpg)

Weigh your dose: a scoop can vary by 30%.

## Tasting: sour and bitter

Many people mix up sourness and bitterness. Sourness is felt on the sides of the tongue, like lemon juice, and it makes your mouth water. Bitterness is felt at the back of the tongue, like dark chocolate or tonic water, and it leaves your mouth dry. Sip the coffee as it cools; flaws become clearer.

#### Does grind size change with the beans?

Yes. Lighter roasts are denser and often need a slightly finer grind. Expect to adjust a little with every new bag.

## Keeping your grinder clean

Coffee is oily. Over time, old oils and fine particles build up inside the grinder and go stale. They add a flat, bitter taste to fresh coffee. Clean your grinder every few weeks:

1. Empty the beans and run the grinder until it is empty.
2. Unplug it (for electric grinders) and remove the top burr if the manual says you can.
3. Brush out the old grounds with a dry, stiff brush.
4. Put everything back and grind a small handful of beans to season the burrs, then throw them away.

Never wash burrs with water unless the maker says so. They can rust.

## Grinding for more cups

When you brew more coffee in the same method, the bed of coffee gets deeper and water takes longer to pass through. So for a larger batch, grind a little **coarser** to keep the brew time in range. For a single small cup, you may need to grind a little finer.

Also remember **retention**: some grinders keep a little coffee inside from the last grind. If you change the setting, grind a few beans and throw them away first, or your first cup will be a mix of old and new.

## Keep a brewing notebook

Write down the coffee, dose, grind setting, water, time and a few words about the taste. It feels slow at first. Within a month you will be able to fix any cup in one or two tries, and you will know your favourite coffees by name.

📌

Key takeaways: sour means grind finer, bitter means grind coarser, and a burr grinder makes everything easier.

## Quick check

Your pour-over tastes sour and thin. What should you change?

- Grind coarser
- **Grind finer**
- Use cooler water

Which grind suits a cafetière (French press)?

- Very fine, like flour
- **Coarse, like sea salt**
- Medium-fine, like sand

Why are burr grinders better than blade grinders?

- They are always electric
- **They make particles of an even size**
- They grind faster