Coffee Grind Size Guide: Matching Grind to Brew Method
The wrong grind size can ruin an excellent bean - and the right one unlocks everything the coffee has to offer. This guide covers every common brew method, the exact grind size each one needs and why it matters. For a broader look at how to choose the right coffee for your brew method, read the complete coffee selection guide on the Hamdan Coffee blog.
How does grind size affect coffee flavour?
Grind size controls how quickly water extracts compounds from coffee grounds. The surface area exposed to water determines the extraction rate - finer grounds expose more surface area and extract faster, coarser grounds extract more slowly.
Under-extracted coffee (too coarse for the brew method or too short a contact time) tastes sour, thin and sharp. Over-extracted coffee (too fine or too long a contact time) tastes bitter, dry and hollow. The right grind size, matched to your brew method's contact time and water temperature, produces a balanced cup - the sweetness, acidity and body all present at once.
This is why grind size is the most practical variable a home brewer can adjust. Changing beans or equipment is expensive. Adjusting your grind takes seconds.
What grind size should I use for a cafetière?
Use a coarse grind for a cafetière (also known as a French press). The grounds steep in contact with water for around four minutes before the plunger pushes them to the bottom - a long, immersive brew time that needs a coarse grind to prevent over-extraction.
A coarse grind also prevents fine particles from passing through the metal mesh filter and making the cup gritty. Think breadcrumbs or coarse sea salt as a visual reference.
Target ratio: 1 part coffee to 15–16 parts water by weight. Water temperature: 90–96°C. Plunge slowly and serve immediately - leaving the coffee sitting on the grounds continues to extract and turns it bitter.
What grind size is right for pour over coffee?
Pour over methods - including V60, Chemex and Kalita Wave - need a medium-fine grind. Water flows through the grounds by gravity, with a contact time of roughly three to four minutes. Too fine and the bed clogs, the brew slows and extraction runs long. Too coarse and the water rushes through before it can extract properly.
Medium-fine is close to table salt in texture - finer than cafetière grounds but noticeably coarser than espresso. Pour in slow, even circles and use water at 90–96°C. The standard ratio is 1 part coffee to 15–17 parts water by weight.
Pour over is the method that rewards grind consistency most directly. A burr grinder, rather than a blade grinder, produces the even particle size that pour over needs.
What grind size does espresso need?
Espresso requires a fine grind - the finest of any common brew method other than Turkish coffee. Pressurised water (around 9 bar) forces through a compressed puck of grounds in 25–30 seconds. The resistance of fine grounds is what allows the right pressure to build.
The target ratio for espresso is 1:2 - one gram of coffee in, two grams of liquid out. Water temperature sits at 90–96°C. Get the grind slightly wrong and the shot either runs too fast and tastes watery or chokes the machine and runs too slow with a burnt, harsh flavour.
Espresso is the most grind-sensitive method. Even experienced home baristas adjust their grind daily - humidity, bean age and roast level all affect how the puck behaves.
What grind size is best for AeroPress?
AeroPress is the most flexible brewer when it comes to grind size. Medium-fine is the most common starting point - similar to pour over - with a brew time of one to two minutes and water temperature of 80–90°C (slightly cooler than most other methods).
Because AeroPress uses manual pressure rather than gravity or pump pressure, brewers can experiment. A coarser grind with a longer steep produces a lighter, cleaner cup. A finer grind with shorter contact time produces something espresso-adjacent. The standard ratio is 1:15 to 1:17 by weight.
AeroPress rewards experimentation in a way espresso machines do not. It is a good method for learning how grind size changes the taste of the same coffee.
What happens if coffee grind size is wrong?
The result is always either under-extraction or over-extraction. Under-extraction happens when the grind is too coarse - water passes through too quickly, pulling out the light, sharp, sour compounds but leaving the sweetness and body behind. The cup tastes thin, acidic and weak.
Over-extraction happens when the grind is too fine - water spends too long in contact with the grounds or pulls compounds out too fast, reaching the bitter, astringent and dry flavours that develop last in the extraction process.
The fix is always to adjust grind size first before changing other variables. If the cup is too sour, grind finer. If it is too bitter, grind coarser. Make one change at a time and taste the result before adjusting again.
Should I grind my own coffee at home?
Yes - grinding fresh at home makes a measurable difference to cup quality. Ground coffee begins losing volatile aromatic compounds within minutes of grinding. Pre-ground coffee, by the time it reaches you and sits in a cupboard, has lost much of what made the bean worth buying.
Whole beans stay fresh far longer. A good burr grinder, even an entry-level hand grinder, produces more consistent particle size than a blade grinder. Consistent particle size means more even extraction and a cleaner, more predictable cup.
If grinding fresh at home is not practical, buy ground coffee in small quantities and store it in an airtight container away from light and heat. Pre-ground coffee from a quality roaster - ground to your specified brew method - is better than whole-bean coffee stored incorrectly.
Quick-reference grind size chart
Use this table as a starting point. Adjust grind size based on how the cup tastes - finer if it is too sour, coarser if it is too bitter.
| Brew Method | Grind Size | Water Temp | Ratio | Brew Time |
|---|---|---|---|---|
| Cafetière / French press | Coarse | 90–96°C | 1:15–1:16 | 4 min |
| Pour over / V60 / Chemex | Medium-fine | 90–96°C | 1:15–1:17 | 3–4 min |
| Espresso | Fine | 90–96°C | 1:2 (in:out) | 25–30 sec |
| AeroPress | Medium-fine | 80–90°C | 1:15–1:17 | 1–2 min |
| Cold brew | Coarse | Cold / room temp | 1:8 | 12–24 hrs |
| Ibrik / Turkish | Extra fine | Below boil | 1:10 | 3–5 min |
"We try to focus not only on different regions, but from a traditional lens - a historical lens. The origin method, the origin of making. We try to make the coffee simple as it is. Too much syrups, too much flavours - the source of coffee is to be what it is."
- Ameen, Founder, Hamdan Coffee
Getting the grind right is part of that same principle. When the extraction is correct, nothing is added and nothing is lost - the coffee tastes like itself. That is the point.
Hamdan Coffee whole beans are available in grind sizes matched to your brew method. Browse the full range here.
