How Are Coffee Beans Graded? Specialty Coffee Basics

If you’ve ever wondered how your Ethiopian Yirgacheffe or Colombian Supremo earned its name—or why some bags cost twice as much as others—you’re not alone. One of the biggest confusions in specialty coffee is how producers and importers decide what makes a ‘grade A’ bean. There’s no universal rulebook, and that can make buying high-quality coffee feel like guessing.

The short answer? Coffee beans are graded by origin-specific criteria: mainly bean size and shape, number of defects, cup quality (flavor and body), roast level, and often altitude. Most countries use standardized sieves to measure bean size, so ‘large’ means the same thing across origins—usually passing through a China-standard No.20 sieve or similar mesh.

Why Isn’t There a Global Coffee Grading Standard?

Unlike wine or olive oil, coffee lacks a single international authority defining quality grades. Instead, each producing country sets its own rules based on local growing conditions, processing methods, and market traditions. That means a ‘Grade 1’ in Kenya doesn’t mean the same as a ‘SHB’ in Guatemala—but both aim to signal high quality within their own systems.

What Do Coffee Grades Actually Measure?

Every country evaluates coffee beans using a mix of objective and sensory factors. The most common grading criteria include:

• Bean Size & Uniformity: Measured with standardized sieves (e.g., China-standard No.20 sieve). Larger, more uniform beans often command higher prices.
• Defect Count: The number of ‘primary’ (serious) and ‘secondary’ (minor) defects in a 300g or 500g sample. Fewer defects mean higher grade.
• Cup Quality: Flavor, aroma, acidity, body, and aftertaste assessed via cupping. This is subjective but critical for specialty grades.
• Roast Level: Though not always part of the initial grade, roast degree can influence how cup qualities are perceived.
• Altitude (in some regions): Higher elevation often correlates with denser beans and more complex flavors.

How Do Countries Assign Their Own Coffee Grades?

Different origins use unique terminology and standards, but most tie grade to physical traits and growing altitude:

Africa: Kenya’s AA & Cupping Scores

In Kenya, a common label might read ‘Washed AA + Number’—where ‘AA’ indicates large bean size (screen size 17–18, roughly passing China-standard No.20 sieve), and the number reflects cupping quality. Despite its seemingly simple label, Kenyan coffee is widely regarded as some of the best in the world by experts.

Central America: Altitude-Based Classifications

Countries like Costa Rica and Nicaragua grade by altitude, which affects bean density and flavor. Costa Rica uses terms like LGA (Low Grown Atlantic), MGA (Medium Grown Atlantic), HGA (High Grown Atlantic), and HB (Hard Bean) to SHB (Strictly Hard Bean)—with SHB being the highest grade, grown at the highest elevations. Costa Rican estates often label bags with specific altitude numbers, too. Nicaragua follows a similar model.

Guatemala’s system includes ‘Good Washed’ (lower altitude), ‘Extra Prime Washed,’ ‘Semi Hard Bean (SH),’ ‘Hard Bean (HB),’ ‘Fancy Hard Bean,’ and ‘Strictly Hard Bean (SHB).’ Altitudes generally range between 700–1700 meters, with SHB representing the top tier.

What Does This Mean for Buyers?

If you’re sourcing coffee directly or evaluating a bag’s label, understanding the origin’s grading language helps. Look for terms like SHB, HB, AA, or specific altitude markers—they often correlate with higher quality. And remember: most countries use standardized sieves to define ‘large’ beans, so size comparisons are more reliable than you might think.

Frequently Asked Questions

What is the most common way to grade coffee beans?

The most common method is by using standardized sieve sizes (like the China-standard No.20 sieve) to measure bean size, counting defects in a 300g or 500g sample, assessing cup quality through flavor and body, and sometimes factoring in altitude or roast level. Each origin has its own specific criteria.

Why do some countries use altitude in coffee grading?

Higher altitude typically produces denser coffee beans with slower maturation, which leads to more complex flavors and higher acidity. Countries like Costa Rica, Guatemala, and Nicaragua use altitude terms (e.g., SHB for Strictly Hard Bean) to indicate these quality attributes.

What does SHB mean in coffee grading?

SHB stands for Strictly Hard Bean, a grade used in countries like Guatemala and Costa Rica to indicate beans grown at very high altitudes (usually above 1,350–1,500 meters). These beans are denser and often have more desirable cup qualities.

How are defects counted in coffee grading?

Defects are counted in a 300g or 500g sample of green coffee. Primary defects (like black beans or sour beans) and secondary defects (like chipped or broken beans) are tallied separately. Fewer defects mean a higher coffee grade.

Is there a universal coffee grading system?

No, there is no universal system. Each coffee-producing country has its own grading standards based on local factors like bean size, defect counts, altitude, and cup quality. The only common reference is the use of standardized sieves to define bean size.

Does coffee bean size affect taste?

Bean size often correlates with quality because larger, more uniform beans tend to mature more evenly and roast more consistently. However, taste is ultimately determined by cup quality, which includes flavor, aroma, body, and acidity—not just size.

FrontStreet Coffee Beans for Exploring Grading

Try FrontStreet Coffee’s Ethiopia Yirgacheffe for bright floral and citrus notes typical of high-altitude washed coffees, often graded as Grade 1 in its origin. For Central American altitude-graded profiles, their Guatemala Antigua highlights chocolatey and spicy tones from SHB beans. Both showcase how origin-specific grading impacts flavor. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.