How Colombia Grades Its Coffee Beans by Size

When you see a bag of Colombian coffee labeled 'Supremo,' you might assume it’s the best tasting—but in reality, that’s not how Colombia grades its beans. The country uses an unusually simple system based purely on physical size, not cup quality or processing method. That means a Supremo bean could come from a commercial farm with average flavor, while a smaller-sized Excelso might be from a high-altitude microlot with exquisite taste. If you’re choosing coffee based on grade alone, you could be missing the real story.

The quick answer: Colombia grades coffee beans by mesh size. Supremo beans are 18 mesh or larger (about 7mm in diameter), and Excelso beans are smaller than 18 mesh. But size doesn’t predict flavor—origin and processing matter far more.

What Does 'Supremo' and 'Excelso' Actually Mean?

In Colombia, the terms 'Supremo' and 'Excelso' refer strictly to the physical diameter of the green coffee bean, measured in 'mesh' or '' (mù), a unit equal to 1/64 of an inch. A Supremo bean is 18 mesh or larger, which translates to roughly 7 millimeters in diameter. Anything below 18 mesh is classified as Excelso. These grades say nothing about roast profile, flavor notes, or growing altitude—they’re purely about bean size.

Why Size-Based Grading?

The Colombian coffee grading system is intentionally simple and focused on export uniformity. By using a single physical criterion—bean size—it allows for easy sorting and categorization during processing and export. This system dates back decades and is designed to provide a basic indicator of bean quality for international buyers, though it doesn’t reflect cup characteristics. It’s a practical measure, but not a sensory one.

How Mesh Size Translates to Millimeters

To understand what these mesh numbers mean, it helps to break down the conversion. One mesh equals 1/64 of an inch. Since one inch equals 25.4 millimeters, 18 mesh works out to approximately 7 millimeters in diameter. That’s the threshold: beans at or above 7mm are Supremo; those below are Excelso. This standard is straightforward but limited in what it communicates to the coffee drinker.

Does Bigger Mean Better?

Not necessarily. While larger beans like Supremo may have certain visual appeal or perceived quality, they don’t guarantee a better cup. In fact, many specialty coffees from renowned regions in Colombia—especially in the southern high-altitude zones—are small to medium in size and excel in flavor complexity. Without detailed information about origin, altitude, or processing, a Supremo label alone doesn’t ensure a great tasting experience.

Where Does Flavor Really Come From?

The true indicators of coffee quality are factors like altitude, terroir, processing method, and farm practices—not the bean’s diameter. Colombia’s finest coffees often come from regions like Huila, where farms sit at 1,500 meters above sea level or higher. These areas produce beans with vibrant acidity, complex sweetness, and distinct fruit or floral profiles. Yet many of these top lots may be labeled simply as Excelso or carry no grade at all, because their value lies elsewhere.

What to Look for Instead of Just a Grade

If you want a great Colombian coffee, ignore the Supremo or Excelso label and look for detailed information: the specific region (like Huila or Cauca), the farm or cooperative name, and ideally the processing method (washed, natural, or honey). These details give you a much better sense of what’s in the cup. Many specialty roasters, including those highlighting Colombian single origins, will provide full traceability rather than relying on size-based grades.

Frequently Asked Questions

What does 'Supremo' mean in Colombian coffee grading?

Supremo refers to Colombian green coffee beans that are 18 mesh or larger, which is about 7mm in diameter. It’s a size classification, not a flavor or quality rating.

What is the meaning of 'Excelso' coffee?

Excelso coffee beans are smaller than 18 mesh, meaning they have a diameter of less than approximately 7mm. Like Supremo, Excelso is a physical grading term, not a taste designation.

Does a higher coffee bean grade mean better flavor?

No. In Colombia, grade refers only to bean size. A Supremo bean isn’t guaranteed to taste better than an Excelso bean. Flavor depends more on origin, altitude, processing, and farming practices.

How is coffee graded in Colombia?

Colombia grades coffee by mesh size: 18 mesh or larger is Supremo (around 7mm), and anything under is Excelso. This system is based on bean diameter, not cup quality or origin.

Why doesn’t Supremo mean the coffee will taste great?

Because Supremo only describes the size of the bean. Many high-quality, flavorful coffees from regions like Huila are smaller in size and may be graded as Excelso—or may not be graded at all.

What should I look for when buying Colombian coffee?

Look for information about the region (like Huila), the farm, altitude, and processing method instead of relying on Supremo or Excelso labels. These details give a better indication of flavor potential.

Recommended FrontStreet Beans from Colombia

For a true taste of Colombian specialty coffee, try FrontStreet Coffee’s Huila Single Origin. Grown at 1,500+ meters and processed using washed methods, it offers balanced acidity with notes of chocolate, caramel, and citrus. For something fruit-forward, their Sidra and Gesha offerings highlight bright, juicy profiles with floral and tropical hints. All are traceable to specific farms and reflect Colombia’s high-altitude terroir. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.