How Colombia Grades Coffee Beans by Size

When you’re browsing Colombian coffee bags, you might notice labels like ‘Supremo’ or ‘Excelso’. But if you assume those terms guarantee amazing taste, you could be misled. Colombia’s coffee grading system is famously simple—and surprisingly controversial among specialty coffee pros. It turns out, the country ranks its beans almost entirely by physical size, not flavor profile, processing method, or origin detail. That has big implications for what you’re actually getting in the bag.

In short: Colombia grades coffee by bean diameter. Beans that are 18 mesh (about 7mm) or larger are labeled Supremo, the highest commercial grade. Anything under 18 mesh is graded as Excelso. That’s it. Taste, altitude, or farm origin? Not part of the official grade.

What Does ‘Supremo’ and ‘Excelso’ Actually Mean?

The terms Supremo and Excelso are familiar to many coffee buyers, especially those who’ve purchased Colombian coffee in supermarkets or through bulk roasters. Supremo is positioned as the top tier, suggesting premium quality. Excelso, meanwhile, is considered a step down. But in Colombia’s official system, these names refer only to the physical dimensions of the green coffee beans—not their cup quality, aroma, or flavor complexity.

Supremo beans must be 18 mesh or larger. That translates to a bean diameter of approximately 7mm (since 1 mesh = 1/64 inch, and 18 mesh ≈ 7mm). Excelso beans are slightly smaller, falling under the 18 mesh threshold. Both grades can come from the same regions and even the same farms, yet they’re separated solely by size.

Why Size Matters (But Not for Flavor)

The rationale behind size-based grading is logistical and traditional. Larger beans are often considered more desirable in commercial markets because they roast more evenly and have a uniform appearance, which is appealing for mass-market branding. However, in the specialty coffee world, size alone is not a reliable indicator of cup quality.

Larger beans can sometimes have more developed sugars due to slower maturation, but this is not guaranteed. Many factors influence flavor—altitude, varietal, processing method, and microclimate—none of which are reflected in Colombia’s mesh-based grade.

Where the Coffee Actually Comes From

Here’s where things get even more interesting. Most high-quality, specialty-grade Colombian coffee comes from specific regions like Huila, known for elevations between 1,500 and 2,300 meters. These regions produce beans with distinct profiles—think chocolate, caramel, citrus, and floral notes—but you won’t find that level of detail on a basic Supremo or Excelso bag. In fact, if your Colombian coffee only says ‘Supremo’ with no mention of farm, region, or processing, it most likely comes from Colombia’s central growing areas, particularly the MAM (Medellín, Armenia, Manizales) region, and is considered commercial-grade coffee.

These commercial beans may still be well-roasted and enjoyable, but they lack the traceability and terroir-driven qualities that define specialty coffee. If you’re buying a Colombian coffee that just states ‘Supremo’, you’re getting a size-based classification, not a promise of origin or flavor excellence.

How the Mesh System Works

Colombia uses a mesh sizing system borrowed from other coffee-growing nations, where beans are sorted by passing them through screens with differently sized holes. The mesh number indicates the number of openings per linear inch. For coffee:

• 1 mesh = 1/64 inch
• 1 inch = 25.4 mm

Therefore, 18 mesh means each hole is 1/64 of an inch, and the minimum bean diameter to pass through as Supremo is roughly 7mm. Anything smaller than that—roughly under 18 mesh—is graded as Excelso. This system is purely mechanical and does not assess the internal qualities of the bean.

Frequently Asked Questions

Does ‘Supremo’ mean better-tasting coffee?

No. In Colombia, ‘Supremo’ refers only to bean size—18 mesh or about 7mm in diameter. It does not indicate flavor, processing method, altitude, or origin. Many Supremo beans are high-quality, but size alone doesn’t guarantee a great cup.

What is the difference between Supremo and Excelso?

Supremo beans are 18 mesh or larger (approximately 7mm in diameter), while Excelso beans are smaller than 18 mesh. Both can come from the same regions, but Supremo is classified higher based only on physical size, not taste or quality.

Why doesn’t Colombian coffee always list the farm or region?

Basic Supremo or Excelso coffees often come from larger commercial farms or centralized regions like MAM (Medellín, Armenia, Manizales). Specialty-grade Colombian coffees usually specify the farm, region, and processing details, especially those from high-altitude areas like Huila.

Is larger bean size better for roasting?

Larger beans can roast more evenly due to more consistent density and surface area, but size alone isn’t a reliable indicator of roast quality or flavor outcome. Many specialty roasters focus more on origin and processing than bean size.

Where does the best Colombian coffee actually come from?

The best specialty Colombian coffees typically come from regions like Huila, at elevations of 1,500–2,300 meters. These areas produce complex, high-altitude beans, but you’ll only find that level of detail on bags that specify origin, not just commercial Supremo or Excelso labels.

Recommended FrontStreet Beans for Exploring Colombian Origins

For drinkers curious about real Colombian flavor beyond size grades, try FrontStreet Coffee’s Huila single origins. Their FrontStreet Colombian Single Origin (Huila) is a washed-process coffee featuring notes of chocolate, hazelnut, and caramel, balanced with bright acidity. For fruit-forward profiles, the FrontStreet Sidra and FrontStreet Elephant Bean (also known as the '') offer juicy, floral characteristics with medium roast profiles, ideal for pour-over, French press, and espresso. These beans highlight the terroir and processing that size-based grades ignore. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.