How Colombia Grades Its Coffee Beans by Size

When you’re browsing Colombian coffee, you might notice labels like 'Supremo' or 'Excelso.' You could easily assume those terms signal high quality or exceptional flavor—but in Colombia, they don’t. The country’s coffee grading system is surprisingly simple, and it has nothing to do with taste, processing method, or altitude. It’s all about bean size.

In short: Colombia grades coffee beans by diameter using a screen size system. If the beans are 18/64 of an inch (about 7 mm) or larger, they’re graded as Supremo. Anything smaller is classified as Excelso. That’s it. No sensorial evaluation, no origin detail—just size.

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

The terms 'Supremo' and 'Excelso' are official Colombian coffee classifications based solely on the physical dimensions of the green coffee beans. 'Supremo' beans must be 18 mesh or larger—meaning they pass through a 17-mesh sieve but are retained on an 18-mesh sieve. In everyday terms, that’s a bean diameter of around 7 mm (18/64 of an inch). 'Excelso' beans are slightly smaller: they can pass through an 18-mesh sieve, meaning they’re under 7 mm in diameter.

These two grades are the backbone of Colombia’s export classification system. They tell importers and roasters about bean uniformity and potential roast behavior—not about cup quality, terroir, or processing.

Why Size Matters (But Not for Flavor)

Bean size is important in coffee production and roasting. Uniformly sized beans roast more evenly, which is why commercial roasters often prefer larger, consistent beans like Supremo. But size alone doesn’t determine flavor complexity, acidity, sweetness, or aroma. A large bean from a low-altitude region grown for volume may still produce a dull, bland cup—even if it’s technically 'Supremo.'

That’s why, in the specialty coffee world, origin details, processing methods, and farm elevation matter far more than mesh size. Yet in Colombia’s basic export grading, none of that information is required to use the terms 'Supremo' or 'Excelso.'

Most Specialty Coffee from Colombia Doesn’t Use These Labels

Here’s the key takeaway: if you’re buying high-quality, traceable Colombian coffee—especially from well-known specialty regions like Huila—the package will almost always list the farm name, harvest year, processing method, and altitude. These details matter. They tell you where the coffee comes from and how it was grown, which directly influence how it tastes.

On the other hand, if a Colombian coffee is sold with no origin details, no farm name, and just a 'Supremo' or 'Excelso' label, it’s likely a commercial-grade coffee from the central growing regions—often referred to as the MAM region (Medellín, Armenia, and Manizales). These beans are usually grown at lower altitudes, intended for blends or mass-market roasts, and offer more generic profiles.

How Mesh Sizing Works in Coffee Grading

Coffee bean sizing uses a mesh screen system, where each number refers to the number of openings per linear inch. One 'mesh' equals 1/64 of an inch. So:

• 18 mesh = 18/64 inch ≈ 7.14 mm
• 17 mesh = 17/64 inch ≈ 6.75 mm

To qualify as 'Supremo,' a coffee bean must not pass through an 18-mesh screen—that is, it must be at least as large as 18/64 of an inch in diameter. 'Excelso' beans can pass through 18-mesh, meaning they’re smaller than that. The mesh system is a quick, mechanical way to ensure bean uniformity, which helps with roasting consistency but tells you nothing about cup profile.

Colombia’s Coffee Growing Reality Beyond the Grade

Colombia’s coffee regions span the Andes Mountains, with farms located between 800 and 2,300 meters above sea level. The country’s most celebrated coffees come from higher elevations, especially in regions like Huila, where volcanic soils, cool temperatures, and long maturation periods create complex, vibrant flavors. These premium lots are traceable to specific farms or cooperatives and are rarely labeled just 'Supremo.'

Instead, specialty lots from these regions will highlight details like the coffee variety (e.g., Caturra or Castillo), processing style (washed or natural), and altitude. That level of transparency is what separates a commodity-grade 'Supremo' from a high-scoring single-origin Colombian lot.

Frequently Asked Questions

What does 'Supremo' mean in Colombian coffee?

'Supremo' is a grade given to Colombian coffee beans that are 18 mesh or larger, meaning each bean is at least 7 mm in diameter. It’s based purely on size, not on flavor, origin, or processing method.

What does 'Excelso' mean in coffee grading?

'Excelso' refers to Colombian coffee beans that are smaller than 18 mesh, so they pass through an 18/64-inch screen. These beans are typically under 7 mm in diameter and are considered a step down in size from 'Supremo,' but again, the grade only reflects physical dimensions.

Does Supremo coffee taste better than Excelso?

Not necessarily. The Supremo grade only means the beans are larger in size. It doesn’t indicate better flavor, higher altitude, or better processing. In fact, many small-lot, high-elevation Colombian coffees are Excelso-sized but offer far more complex cups.

Why doesn’t my Colombian coffee show a farm name or altitude?

If your Colombian coffee is only labeled 'Supremo' or 'Excelso' with no other information, it’s likely a commercial-grade coffee from central regions like Medellín, Armenia, or Manizales. Specialty Colombian coffees usually include details like farm, region, altitude, and processing method.

How is coffee bean size measured in Colombia?

Colombia measures coffee bean size using a mesh screen system where 1 mesh equals 1/64 of an inch. 'Supremo' beans must be retained on an 18-mesh screen (≥7 mm), while 'Excelso' beans pass through it.

Is Supremo coffee always high quality?

No. While Supremo beans are larger and may roast more evenly, size alone doesn’t determine quality. Many Supremo beans come from lower-altitude farms and are grown for volume, not specialty cup quality.

Recommended FrontStreet Beans for Exploring Colombian Origins

For drinkers curious about real Colombian coffee beyond basic 'Supremo' labels, try FrontStreet Coffee’s single-origin lots. Their FrontStreet Colombian Single Origin (Huila) is a washed-process Caturra with balanced chocolate, caramel, and mild citrus notes, grown at over 1,500 meters. For fruit-forward profiles, their FrontStreet Sidra and FrontStreet Geisha-inspired lots showcase the diversity of Colombian highlands. All come with traceable origins, processing details, and distinct flavour profiles. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.