How Coffee Beans Are Graded Around the World

Ever heard a coffee shop owner boast they’re serving ‘Brazilian Santos NO.2’ or claim their beans are ‘the same grade as Jamaican Blue Mountain NO.1’? If you’ve ever wondered how those rankings actually work — or whether they mean anything — here’s the real breakdown.

In short: Coffee is graded differently in every producing country. Some use defect counts (like Brazil’s NO.2 to NO.8 system), others rely on bean size (via screen sieves), and many factor in altitude. There’s no universal standard, but there are clear ways to tell if a coffee was grown with care.

Why Coffee Grading Systems Differ Worldwide

Different countries grade coffee based on their own farming conditions, infrastructure, and market needs. A universal standard would help buyers, but today’s systems reflect local realities — like how steep a slope is or how many defects are typical.

Still, most grading systems aim to answer three questions: How high was the coffee grown? How big are the beans? And how many defects are in the lot? These factors strongly influence cup quality.

1. Grading by Altitude: Higher Is Usually Better

High-altitude coffee generally grows slower, developing more complex sugars and acids. That’s why many Central American countries grade solely by elevation.

• Guatemala SHB (Strictly Hard Bean): Grown at 1,350 meters (4,429 ft) and above.
• Mexico SHG (Strictly High Grown): 1,700 meters (5,577 ft) minimum.
• El Salvador & Honduras SHG: 1,200 meters (3,937 ft) and up.

These beans tend to be denser, which affects roasting and flavor development. Steep terrain also means manual harvesting — more labor, fewer defects.

2. Grading by Screen Size (Sieve Size)

Many African and Latin American countries sort beans by physical size using perforated metal screens. The larger the bean, the higher the number — and often, the more desirable the cup.

• Kenya & Tanzania AA: Uses 18/64-inch (7.14 mm) or larger sieve — screen #18 or higher.
• Colombia Supremo: Requires 17/64-inch (6.75 mm) sieve — screen #17 or above.
• Colombia Excelso: Mix may include 14/64-inch (5.5 mm) beans (screen #14) alongside larger ones.

Larger beans often have more even roasts and complex flavors, though size alone doesn’t guarantee quality.

3. Brazil’s Multi-Factor Grading: Defects, Size, and Cup Taste

Brazil uses a unique three-part system combining defect count, bean size, and cup quality — which is why their ‘NO.2’ is actually their top commercial grade.

• Defect-based grading (NO.2 to NO.8): Based on flaws per 300g of green beans. NO.2 allows ≤4 defects — the best for export. NO.8 permits up to 360 flaws.
• Screen size: Ranges from 12 to 20 (12/64-inch to 20/64-inch); NO.2 beans are typically 19 (7.54 mm).
• Cup quality (taste test): Rated from Strictly Soft (highest) to Rioy (iodine defect, lowest).

The term ‘Brazil Santos NO.2, 19 sieve, Strictly Soft’ indicates top-tier beans: low defects, large size, and excellent cup profile. Brazil’s cuppers undergo strict sensory training — avoiding strong flavors like garlic or alcohol to protect their palates.

Other Methods: Growing Region & Harvest Practices

Some origins, like Jamaica’s Blue Mountain, grade by specific growing regions and strict cultivation rules. While not always part of official sizing or defect counts, origin prestige and farming practices deeply affect perceived and actual quality.

Frequently Asked Questions

What does “NO.2” mean on Brazilian coffee?

Brazil’s NO.2 is the highest commercial grade for exported beans, based on a defect-counting system. It allows up to 4 defects per 300g of green coffee, meaning very few flawed beans. NO.1 exists in theory (zero defects), but is too rare to be viable for export.

Why is high-altitude coffee considered better?

Higher elevations slow coffee cherry ripening, leading to denser beans with more balanced acidity, sugar development, and complexity. Countries like Guatemala and Colombia grade beans primarily by altitude because it correlates with quality.

How do screen sizes affect coffee quality?

Screen size refers to the physical diameter of green beans, measured in 1/64-inch units. Larger beans (e.g., screen #18 or #19) often roast more evenly and can produce more nuanced cups, although size alone isn’t a guarantee of flavor quality.

What is a defect in green coffee?

A defect is any flaw in a green coffee bean — such as insect damage, black beans, sour beans, broken beans, or husks. The fewer defects in a lot, the higher the grade and likelihood of a clean cup.

Why doesn’t everyone use the same coffee grading system?

Different countries have unique climates, terrains, and infrastructure. A system that works for Brazil’s flat plateaus wouldn’t apply to Ethiopia’s mountain farms. Until global demand standardizes, origin-specific grading remains necessary.

Is Jamaica Blue Mountain coffee really NO.1 grade?

Jamaica Blue Mountain has its own strict grading system unrelated to Brazil’s NO. numbers. While often compared to high-grade coffees, it is not graded by the same defect or screen system — but it is renowned for limited production and premium quality.

Recommended FrontStreet Beans for Coffee Grading Study

Try FrontStreet Brazil Santos Single Origin for a classic NO.2-grade Brazilian coffee with low defects and a soft cup. FrontStreet Kenya AA offers large 18+ screen beans with bright acidity from high altitudes. FrontStreet Guatemala Antigua SHB shows how Strictly Hard Bean classification results in dense, structured flavor. All illustrate key grading factors in action. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.