Does Coffee Bean Size matter to your coffee’s taste? – Coffee Quiz

One of the things I love when buying coffee is browsing the shelves of my local roastery, deciding which pack of coffee will be my next.

I do have some personal favorites, sure. But you leave so much flavor and aroma on the table, when you don’t try new things every once in a while…

The Single Origin Blends I usually go for, always have variety, grind, roast, etc. written on the outside. Sometimes something that describes their taste as well, but it was only recently that I noticed…

What is the Bean Size doing here?

So, confused as I was, I asked one of the roasters. What he told me was that, when it comes to coffee beans, size is one of the vital things that define their quality.

But that made me wonder…

Why does that matter? How does it impact the flavor? Are larger or smaller beans better?

So without further ado, this is what I found!!!

Size-based Grading System

Before going forward with the big questions, however, let’s cover up some basics, shall we?

During the processing of the beans, either at the start or the finish, depending on the producer, coffee is sorted out based on its size in a procedure called Screening.

This process basically involves several sieves with different hole sizes, from which the beans are passed through.

The sieves, large and square as they are, are called Screens (hence the name Screening), and their hole sizes range from 20/64 of an inch (8.0 mm), to 8/64 of an inch (3.2 mm), used for sorting the coffee beans based on their size.

The bean sizes from 20/64 to 8/64 are called “Grades”, and are used, in most cases, as a quality determinant.

Why size matters?

In general, the larger the beans, the better the flavor.

This has to do mainly with the time the plant has had to grow and ripen, and as an immediate consequence, the time it had to develop its aroma and taste.

The largest beans of Arabica and Robusta, the two kinds of coffee that represent around 97% of worldwide production, are called elephants, and they are 19/64 and 20/64 of an inch in size. They are an exception, as well as Peaberries, to the general size-flavor relation, and we will talk more about them later.

The Different names and traits of Commercial Sizes

Coffee beans from 18/64 to 17/64 of an inch are simply called “Large” in industrial terms but come with different names depending on their place of origin.

For example, they can be found as Supremo (Colombia), Superior (Central America) and AA (Africa and India). If you see one of these names on the package, it is an indicator of high-quality beans.

It means they had time to develop their profile and if the processing is done right, that will be evident in your cup!

After them, we have the “Medium” size beans (Excelso, Segundas or AB), that range from 15/64 to 16/64 of an inch in size.

Despite not having as much time as the large beans to ripen, there are some very-well processed medium size beans that can easily go on par, or even exceed their slightly larger relatives in overall cup quality.

Next ones are the “Small” beans (UCQ, Terceras, or C), which size at 14/64 of an inch, and are the lowest quality with acceptable, satisfactory taste.

Of course, that isn’t always true because in some countries, like Ethiopia, which produce smaller beans in general, these beans can lead to very vivid flavors and rich aromas when managed properly.

Anything smaller than 14/64 of an inch is called a “Shell” and is considered a cheap coffee bean size.

There is an exception to that as well, the Peaberry beans, of which we will talk about in the next section!

Exceptions

There are two main exceptions where the size-quality relation breaks. These exceptions are Elephant sized beans, and Peaberries.

Elephant beans, which are mainly found in Africa and India, encounter problems when it comes to roasting, and that’s the reason they are not considered good.

Due to their size, they tend to be softer than other beans, so they break earlier than supposed to, resulting in an imbalance of flavors.

The Elephant exception is only true for Arabica and Robusta varieties, though. There are 2 more, less dominant varieties, Liberica and Excelsa, that account for 3% of global production.

These varieties grow much taller than the average tree (up to 20m) and produce beans as large as Elephants. However they are considered very high quality because they are not as soft, so the roasting process flows much smoother.

Peaberries on the other hand, while incredibly small (8/64 to 13/64 of an inch), tend to be one of the most flavorful and “cream of the crop” beans, known for their premium profile and delightful aromas.

What leads to the size?

Size is a result of several separate factors.

The main determinant of coffee size is the variety of the beans, however, different conditions such as weather and altitude can also impact the size.

If all conditions, from soil to altitude to weather are not met, a coffee bean can end up as small as half the average size of its variety, resulting, in most cases, in a suboptimal result.

It should be noted that coffee cherries, from which the beans are extracted, don’t grow at the same speed even under the same conditions, so that’s why a single crop can consist of a range of different sizes.

Conclusion

After this article, I am confident many of you will start noticing the size of your beans more often.

I believe that’s a good thing. Now you know much more about what each size means for your own cup.

That said, there are many roasteries that blend all sizes of beans and generate fascinating results, taking everything into account, from variety to roast to what brewing method will be used in each blend.

The bottom line is that… Yes, size does matter when it comes to your daily cup, but the only way to really know if you like it, is to try it yourself!!

FAQs about Coffee Bean Size

Does coffee bean size matter for taste? What is "screen size" on a coffee bag? Why do specialty roasters care about bean size uniformity? Are smaller beans always lower quality? Does bean size affect grinding?

Does coffee bean size matter for taste?

A bit, but less than people think. Larger beans (high screen size — 18+) often come from higher altitudes and tend to be denser, which correlates with better flavor potential. But bean size alone isn’t a quality marker; processing, varietal, and roasting matter more. Try our Colombia Caturra (typically screen 17–18) to taste a properly graded bean.

Colombia Cerro El Pital - Arabica Caturra USD $40.00 /

What is "screen size" on a coffee bag?

Screen size = the diameter of the bean in 64ths of an inch. Screen 18 = 18/64ths = ~7mm. Higher screen numbers = bigger beans. Specialty coffee is typically screen 17+; commodity coffee is screen 14–16. Our specialty roasts are all in the 16–18 range.

Anniversary Blend (Colombia, Brazil, Indonesia) USD $35.00 /

Why do specialty roasters care about bean size uniformity?

For roast consistency. If your batch contains both screen-15 and screen-18 beans, they roast at different rates — small ones over-cook while big ones under-cook. Sorting beans to uniform size means a more even roast and a cleaner cup. Japanese specialty roasters are especially strict on this.

Are smaller beans always lower quality?

Not always. Some elite varietals (Geisha, Pacamara, Bourbon) naturally produce smaller beans with extraordinary flavor. Size is a rough proxy for quality, not a guarantee. The bigger signal is consistency — you want all beans in a bag to be roughly the same size, whatever that size is.

Does bean size affect grinding?

Slightly. Mixed-size beans grind unevenly because larger beans require more burr engagement. If you’re seeing inconsistent grind from a good grinder, mixed bean sizes might be a culprit. Stick with specialty single-origin coffee like our Brazil Cerrado for the most uniform grind output.

Brazil Cerrado - Arabica Catuai USD $35.00 /

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