How Colombia Grades Coffee by Bean Size, Not Flavor

When you buy a bag of Colombian coffee labeled 'Supremo', you might assume you're getting the best-tasting beans. But in Colombia, the term 'Supremo' doesn't mean premium flavor — it refers only to the physical size of the beans. That can be confusing, especially if you're looking for cup quality rather than just appearance.

The quick answer: Colombia grades coffee beans by size, not taste. Supremo beans are 18 mesh (about 7mm in diameter) or larger, while Excelso beans are smaller than 18 mesh. Neither grade guarantees flavor quality — that depends more on origin and processing. Most single-origin or specialty lots from Colombia include detailed farm or regional info, while generic bags often come from the MAM region and are commercial-grade.

Colombia’s Coffee Grading Is Based on Bean Size Alone

Unlike other coffee-growing countries that may factor altitude, cupping score, or processing method into their grading systems, Colombia keeps it simple: coffee is graded primarily by the size of the green beans. This means a 'Supremo' coffee isn’t necessarily a great-tasting coffee — it’s just a big one.

The system focuses entirely on the physical dimensions of the beans, using a mesh screen system to sort them. There’s no official requirement for flavor profile, origin transparency, or even processing method under this grading standard. That’s why, if you’re after taste, you’ll need to look beyond the label.

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

In Colombia’s grading system:

• Supremo: beans that are 18 mesh or larger. That translates to a bean diameter of approximately 7mm (18 × 1/64 inch, with 1 inch = 25.4mm).
• Excelso: beans that are smaller than 18 mesh. They don’t pass through the 18-size screen but are still within a defined upper limit.

So, Supremo beans are bigger, but that’s the only guaranteed difference. The terms say nothing about where the coffee was grown, how it was processed, or how it might taste once brewed.

Why Size-Based Grading Doesn’t Reflect Cup Quality

Bean size can influence aspects of roasting and brewing consistency, but it doesn’t directly correlate with flavor complexity, acidity, sweetness, or aroma. In specialty coffee, factors like altitude, soil, varietal, and processing method matter far more than the millimeter size of the green bean.

Colombia’s size-based system dates back to a time when exportable quality was more about uniformity and appearance. While it still helps sort beans efficiently for certain commercial purposes, it tells you little about what’s inside the cup.

Most High-Quality Colombian Coffee Lists Its Origin

If you’re buying Colombian coffee and want something tasty, look for bags that specify the farm, cooperative, or region — especially those from well-known high-altitude areas like Huila. These regions, especially above 1500 meters, are known for producing complex, vibrant coffees thanks to rich volcanic soils, consistent mist cover, and optimal growing conditions.

Generic Colombian coffee that lacks detailed labeling often comes from the MAM region (Medellín, Armenia, and Manizales), where beans are typically commercial grade. These are usually Supremo or Excelso by size, but without the traceability or quality control you get from single-farm lots.

Understanding Mesh Size and How Coffee Beans Are Sorted

Mesh size in coffee grading refers to the number of openings per linear inch on a metal screen. The higher the mesh number, the smaller the holes — and the smaller the beans that can pass through.

• 1 mesh = 1/64 of an inch
• 1 inch = 25.4mm
• Therefore, 18 mesh ≈ 7mm bean diameter

Supremo beans must be large enough to remain on an 18-mesh screen or higher. Excelso beans are sorted to remain on a larger screen (also 18 mesh), but are generally smaller in overall selection and may also include beans that pass through 18 but not a smaller size. The sorting process ensures uniformity in size, which is helpful for even roasting but unrelated to flavor development.

Frequently Asked Questions

Does Supremo mean high-quality coffee?

No. In Colombia, 'Supremo' refers only to coffee beans that are 18 mesh (approximately 7mm in diameter) or larger. It does not indicate anything about the flavor, aroma, acidity, or origin of the coffee. Supremo is a size grade, not a quality or taste grade.

What is the difference between Supremo and Excelso coffee?

Supremo coffee beans are graded as 18 mesh or larger (about 7mm in diameter), while Excelso beans are smaller than 18 mesh but still within an upper size limit. Both terms refer only to physical bean size, not to flavor, processing, or origin.

Why does Colombia grade coffee by size?

Colombia uses a size-based grading system primarily for sorting and export consistency. It’s a simple way to ensure uniform bean size, which helps with roasting evenness and visual appeal. However, it doesn’t reflect cup quality, which depends more on altitude, processing, and origin.

What mesh size is Supremo coffee?

Supremo coffee is graded as 18 mesh or larger. This equates to a bean diameter of around 7mm, calculated as 18 × (1/64 inch), with 1 inch equaling 25.4mm.

Is Excelso coffee lower quality than Supremo?

Not necessarily in terms of taste. Excelso beans are smaller than 18 mesh, so they’re not classified as Supremo, but they can still be high-quality. The Excelso designation only refers to size, not flavor or origin. Many excellent coffees are Excelso grade.

Where does the best Colombian coffee come from?

The best Colombian coffee often comes from high-altitude regions like Huila, which is above 1500 meters. These areas have rich volcanic soils, ideal climate conditions, and often provide traceable, single-farm lots with detailed flavor profiles. Generic beans without origin details often come from the MAM region and are typically commercial grade.

Recommended FrontStreet Beans for Size & Flavor Exploration

For drinkers curious about how size and origin affect flavor, try FrontStreet’s Colombian offerings. Their FrontStreet Colombian Single Origin from Huila is a medium roast, natural washed Caturra with notes of chocolate, hazelnut, and caramel — balanced and approachable. For fruit-forward profiles, the FrontStreet Sidra and FrontStreet Geisha-influenced lots showcase Colombian terroir with floral and juicy characteristics. All highlight traceable farms and altitudes above 1500m, offering more than just 'Supremo' sizing. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.