How to grind your coffee | A guide for the home coffee brewer

For those who are new to grinding their own coffee or those just looking to improve their craft, we’ve laid out everything you need to know in our complete coffee grind guide.

One of the most important steps in making a great cup of coffee is the grind. Grind size has a huge impact on the flavour in the cup and can turn a roast that’s bold and rich into a brew that's overly acidic or bitter. While it’s simple enough to just buy pre-ground coffee, it’s hard to argue the fact that coffee is always at its best when freshly ground.

Why is fresh-ground coffee better?

Roasted coffee beans oxidise naturally over time.

When we grind coffee, we open more surface area of the bean to the oxidation effects and speed up the process, releasing all the C02 gasses inside that have been created during roasting. It’s these gasses that account for the amazing aromas we get with a batch of freshly roasted or freshly ground coffee beans.

If you compare freshly ground coffee to beans that were ground even just a few hours ago, the difference will be stark.

Is buying pre-ground coffee bad?

We always recommend a little and often approach to buying coffee. Only get enough to last a week or two and constantly top up with a fresh roast.; especially if you're buying pre-ground coffee.

Our coffees are roasted, ground, packed and dispatched the same day to ensure minimal time between roasting and brewing. However, as soon as you break that bag seal, your coffee is exposed to oxygen, moisture, CO2 depletion and potential contamination, all of which affect flavour and freshness, particularly with the increased surface area that comes with ground coffee.

The Allpress Coffee Grind Chart

When it comes to brewing coffee, each method requires a different grind size to ensure a good extraction. Grind size can range from super fine talcum powder for commercial espresso machines, to larger granules like rock salt for plungers.

To simplify the process, we’ve created our Allpress Coffee Grind Chart to guide you to achieve the perfect grind for your home brew method.

How to grind coffee for Espresso

Espresso sits at the top of our grind scale; the texture here is as fine as possible — think flour or talcum powder.

Brewing espresso is fast and high-pressured, so a very fine grind is critical to the success of your flavour extraction. For those without a high-grade espresso machine, you may have to aim for something slightly coarser to match the pressure output of your machine and achieve a good extraction.

Grinds that are too fine can clog your group and impact the flow of water. The result of this can be some cups end up bitter and ashy, while others taste sour or weak. If you are shopping for pre-ground espresso online, it's important to know your machine and whether the coffee is pre-ground for commercial or home espresso.

We recommend opting for smaller quantities and more frequent purchases to ensure the best flavour from your brews. The ideal shelf life for ground espresso is 7-10 days (if your coffee is stored in an airtight container), after which you may have to adjust your dose and brew ratio for a good result.

How to grind coffee for Filter and Pour Over

Pour over requires a grind that is finer than sand but coarser than espresso (think table salt). If your coffee is coming out consistently thin or weak, try a finer grind; if your brew is consistently bitter, or brothy, try a coarser approach.

How to grind coffee for AeroPress

The AeroPress is unique in that your grind target can range anywhere from quite fine (think caster sugar or table salt) all the way down to fairly coarse (breadcrumbs), depending on your preference.

The AeroPress is versatile and can brew with finely ground coffee, stirred, and plunged after 30-40 seconds; or with coarsely ground coffee, steeped for around 3 minutes. It really is the brewer’s choice on this one.

How to grind coffee for Chemex

The best grind size for Chemex is a little coarser than table salt. This is largely due to Chemex filter papers being thicker than your standard V60 or Kalita filter, as well as the depth of the coffee bed; this tends to slow down the extraction.

How to grind coffee for Moccamaster

Moccamaster sits further down our grind scale; aim for a grind that is fairly coarse (think rock salt or breadcrumbs).

Your typical Moccamaster will take approx. five minutes to brew, during which time the machine has a constant flow of water. As a result, there is a lot of contact time between the water and the coffee grounds. If you find that your Moccamaster basket is overflowing, you’re using a grind that is too fine.

How to grind coffee for Plunger

Plunger grind sits at the bottom of our scale; your grind size should be between rock salt and breadcrumbs. Plunger coffee involves a fairly long brew time, the grind you’re using should be relatively coarse to avoid over-extraction.

When it comes to grinding and brewing coffee, our grind chart is here for guidance to give you a starting point. Different grinders will give you different results and the best approach is always to experiment using the tools you have available until you find the perfect grind size. With Allpress, you're after a balanced result with your peak flavour experience.