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Here's why you're grinding your coffee incorrectly

Here's why you're grinding your coffee incorrectly

Whole beans or ground?

That's one of the first things my father taught me to ask when taking an order from a customer. Its funny to see people's reactions when we ask that question. Some folks know exactly what grind they are looking for, while others are trying to remember what the inside of their coffee machine looks like. Coffee grinds are an important piece of the brewing puzzle and, like all things related to coffee, there are guidelines.

Making a good cup of coffee involves coffee extraction. Extraction is the process by which we dissolve soluble flavors from the coffee grounds in water. Put simply, how much of the coffee in the brewer ends up in the cup. The SCAA recommends 18% to 22% extraction for both brewed coffee and espresso. This means that about one-fifth of the coffee in your brewer should end up in your cup. Unless you have a refractometer, there isn't a way to measure this, which is why most of us rely on our taste buds and past experiences.

Often times if the coffee isn't up to our standards we do one of two things: adjust the amount of coffee, or adjust the grind size. Neither one is bad, but let's take a look at why grind size matters.

The size of the coffee grind plays a major role in the extraction process. Finer grinds will extract more coffee, while courser grinds will extract less. The reason is due to the overall surface area of the ground coffee. The more surface area, the more water comes into contact with the coffee, which results in more extraction. Take a look at the images below.

Imagine the coffee grinds are the size of these golf balls. There would be very minimal contact time with them because they are so large, and the water would just run straight through them.

Now imagine the coffee grinds are the size of lentils (my mother-in-law makes an amazing lentil soup). The water would have a lot more contact time with the coffee when compared to the golf balls.

Overextraction results in intensely bitter coffee, while underextracted coffee is usually sour and lacking in complexity. But let me be clear that selecting the proper grind size is a guideline and a matter of taste. What ultimately matters is if you like the way the coffee tastes, and not something you read online. Case in point, my father-in-law uses very fine coffee grinds in his coffee maker. It tastes extremely bitter to me, but he loves it!

Coffee Grinds

Let's take a close look at the actual size of traditional coffee grinds and what filters/machines they are normally used for.

French Press Grind
French Press
Cold Brew

Drip Grind
Cupcake-Shaped Paper Filter
Hario V60

Cone Grind
Cone-Shaped Paper Filter
Stove top Espresso
Melita Pour Over

Fine Grind
Armenian/Middle Eastern/Greek Coffee

Regardless of what machine you use, remember that the grind size plays a major role in making a great cup of coffee. Try experimenting with different grind sizes next time you brew, and you might turn your old coffee into something new.


Photo credit: Bigstock

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Peter van der Akker

- February 01, 2022

interesting point.. I never heard a thing called Armenian coffee and everybody knows Greek coffee is just Turkish coffee. I guess that shows how much henryshouseofcoffee knows about coffee.


- February 01, 2022

you said “Armenian/Middle Eastern/Greek Coffee” not even say turkish. taking politics into coffee is interesting thing. i’m not saying this method %100 belongs us but it is fact for hundreds years it is named as “turkish coffee” after 1974, some political issues, name changed.


- February 01, 2022

Very Nice, I just came across this page , It’s funny , My name is Henry and I used to roast coffee at my cousins coffee roastery family business in Tehran called "SET Coffee "( Set is short for Setrak, the founders name) they have been in business for about 100 years.
Its nice to see other armenian coffee( soorge) businesses around


- February 01, 2022

HAHA I also used to ask customers what they want ,whole been or ground and , if they had paper or metal mesh filter , all these brought back memories, oh and the smell of freshly roasted and ground armenian coffee.

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