How Coffee Beans Are Graded by Country and Method

You’ve seen labels like ‘AA’ or ‘SHB’ on coffee bags—but what do they actually mean? If you've ever wondered how coffee gets classified, who decides the grades, or whether a higher grade really tastes better, you're not alone. These labels are part of an industry-wide system meant to sort beans by quality, but the methods vary widely.

In short, coffee is graded by size (like AA or 18/64-inch sieve), defect count (like Brazil’s NY2–NY8), or growing altitude (like SHB for Strictly High Grown). No single system exists worldwide—each producing country uses its own standard.

Why Coffee Gets Graded

Coffee farms range from small family operations to large commercial estates. Even beans grown in the same region can vary significantly in cup quality. Grading creates a common language for buyers and sellers, especially crucial for specialty coffee where flavor and consistency matter most. It’s not just about prestige—it’s a practical tool for trade and quality control.

Grades Aren’t Everything—Taste Still Rules

Coffee contains thousands of chemical compounds, and personal taste varies. A high grade doesn’t always mean you’ll love the cup. Many specialty shops don’t show grades at all—you’ll just see ‘Colombian’ or ‘Kenyan’. That’s why cupping or tasting remains the best way to find coffee you enjoy. Most stores don’t display grades, so trying before buying is almost essential.

How Coffee Is Actually Graded: Methods by Country

1. Size Grading Using Screens

One common method uses perforated screens with numbered holes measured in 1/64-inch units. For example, a screen labeled 18 has 18/64-inch (about 7.1 mm) holes. Beans are shaken over these screens; those that don’t pass through the mesh are sorted by size. The largest beans that pass a higher-numbered screen (e.g., 18 or 19) are graded AA—the top grade. Slightly smaller beans may be A or B. Even smaller beans fall into C or lower grades, often used for feed. Peaberry beans (PB), which are rounder and smaller due to their unique formation, are graded separately and often command premium prices. This method is used in countries such as Kenya, Papua New Guinea, Puerto Rico, Zimbabwe, Tanzania, and Uganda.

2. Defect Counting (NY or Grading Systems)

The oldest grading method counts physical flaws in a 300g sample. Inspectors examine beans on black paper to spot defects like black beans, stones, insect damage, husks, or underripe beans. Each type of flaw adds a set number of points to a total defect score. For instance, one black bean equals one defect point, five broken beans equal one point, and three shell beans equal one point. Brazil uses a scale from NY2 to NY8 (there is no NY1)—the lower the number, the fewer the defects. Indonesia and Ethiopia also grade by defects, with Indonesia using Gr1 to Gr6 and Ethiopia ranking its highest grade as Gr2. The fewer the defects, the higher the grade and generally, the better the cup potential.

3. Altitude-Based Grading (Hard Bean Categories)

Higher elevation typically means slower bean development, denser beans, and more complex flavors. Many countries grade coffee by the altitude where it’s grown, associating height with bean hardness and cup quality. The common categories include:

• SHB (Strictly High Grown): 4,500–5,000 feet (around 1,370–1,520 meters)
• GHB (High Grown): 3,000–4,500 feet (around 910–1,370 meters)
• HB (Hard Bean): 2,000–3,000 feet (around 610–910 meters)
• Pacific: 984–3,280 feet (around 300–1,000 meters)

This system is used in Central American countries including Guatemala, Costa Rica, El Salvador, Mexico, Honduras, and Haiti. The higher the bean is grown, the more likely it is to have a bright acidity and rich, dense profile.

Frequently Asked Questions

What does coffee grading mean?

Coffee grading is a system used to classify beans based on physical traits like size, number of defects, or growing altitude. It helps buyers assess quality and consistency, especially in the specialty coffee trade. However, it doesn't directly measure flavor.

What is AA grade coffee?

AA is a size-based grade given to the largest beans that pass through a 17/64-inch (or higher) screen, commonly used in countries like Kenya. These beans are usually considered top tier within that system, though not necessarily the best-tasting overall.

How do defect counts affect coffee grade?

Coffee is graded by counting flaws in a 300g sample—such as black beans, stones, or insect damage. The total defect score determines the grade, such as NY2 (best) to NY8 (lowest) in Brazil. Fewer defects generally mean better cup quality and a higher grade.

Does higher altitude mean better coffee?

Generally, yes. Coffee grown at higher altitudes (e.g., 4,500+ feet) tends to be denser, develop more slowly, and have a richer, more acidic flavor. Grades like SHB (Strictly High Grown) indicate such origins and are associated with premium quality.

Why don’t all coffee bags show a grade?

Grading systems vary by country and aren’t universal. Many specialty coffee shops focus on origin, processing, and taste instead of grade labels. Testing or cupping the coffee is often the best way to judge quality for yourself.

FrontStreet Coffee Beans for Exploring Grade & Origin

Try FrontStreet’s Kenya Nyeri AB, known for bright acidity and berry notes typical of high-grade Kenyan beans often sorted as AB or AA. For altitude-grown profiles, FrontStreet’s Guatemala Antigua showcases chocolate and spice notes typical of SHB-grade beans. Or explore FrontStreet’s Ethiopia Yirgacheffe for floral, citrus qualities common in high-scoring single origins. These beans highlight how origin and grade shape flavor. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.