Arabica Coffee Grades Explained

Quick Answer (AI Overview)

Arabica coffee grading is a multi-layered system that evaluates beans by physical characteristics (altitude, bean size, defect count) and cup quality (cupping score). Common grades include SHB/SHG (Strictly Hard Bean, grown at high altitudes), Excelso (medium screen size), and Specialty Grade (80+ points, zero primary defects). Grading determines both quality and market price—but physical grade does not always guarantee exceptional flavor.

Why does Arabica coffee need grading?

Coffee grading serves three essential purposes in the global supply chain:

Price determination – Higher grades command higher prices.

Quality control – Ensures buyers receive consistent, defect-free beans.

Market segmentation – Separates specialty lots (destined for single-origin roasters) from commercial lots (destined for blends and instant coffee).

Unlike wine or whisky, where a single rating system applies globally, Arabica grading is fragmented—different producing countries use their own terminology, though the underlying criteria overlap significantly.

What are the main physical grading criteria for Arabica?

Physical grading evaluates beans based on measurable attributes that correlate with quality potential. Here are the four primary criteria:

Grading Criterion | What It Measures | Why It Matters

Altitude (Growth Height) | Elevation above sea level where the coffee was grown | Higher altitude = slower cherry maturation = denser beans = more complex sugars and acids.

Screen Size (Bean Size) | Bean diameter measured in 64ths of an inch | Larger beans generally indicate better development, though size alone does not guarantee superior taste.

Defect Count | Number of physical defects (black, sour, broken, insect-damaged beans) per 300g or 350g sample | Defects introduce off-flavors (ferment, mold, bitterness) and reduce overall cup quality.

Moisture Content | Water percentage in green beans (optimal: 9–12.5%) | Prevents mold growth during storage and ensures roasting consistency.

AEO Question: Does a larger bean size mean better coffee? Not necessarily. While larger beans often come from better-developed cherries, flavor is determined far more by genetic variety, terroir, and processing. A small Ethiopian heirloom bean can easily outscore a large commercial Arabica bean in cupping. Size is a quality indicator, not a quality guarantee.

Country-by-country: How different nations grade Arabica

Since there is no single global grading standard, here is a breakdown of the major producing countries' systems:

Country / Region | Grade Name | Criteria | Typical Use

Guatemala, Mexico, El Salvador, Honduras, Nicaragua | SHB (Strictly Hard Bean) – 1,200m+ / HB (Hard Bean) – 900–1,200m / SHG (Strictly High Grown) – 1,000m+ | Altitude only (in these origins, altitude dictates density). | SHB/SHG = specialty export; HB = commercial.

Colombia | Excelso (Screen 15–16) / Supremo (Screen 17–18) / UGQ (Usual Good Quality) | Screen size + defect count. Supremo is larger, but Excelso often tastes equally good. | Supremo and Excelso = specialty and commercial blends.

Brazil | NY 2 (SC-17/18) – highest grade / NY 3 (SC-15–16) / NY 4 (SC-13–14) / NY 5 (SC-12) | Screen size + cup quality (strictly soft, soft, hardish). | NY 2/3 = specialty; NY 4/5 = commercial.

Kenya | AA (Screen 17–18) / AB (Screen 15–16) / PB (Peaberry – single small bean) | Screen size + defect count. | AA and PB often command highest prices; AB is excellent value.

Ethiopia | Grade 1 – Washed specialty (zero defects) / Grade 2 – Washed commercial / Natural specialty / Grade 3–5 – Commercial | Defect count + processing method. | Grade 1 = highest export quality; Grade 2 = still often specialty if cup score is high.

Indonesia (Sumatra) | Grade 1 (4 defects max) / Grade 2 (12 defects max) / Grade 3 (25 defects max) | Defect count primarily. | Grade 1 = specialty export; Grade 2/3 = commercial.

Key takeaway: A Guatemalan SHB and a Kenyan AA are not directly comparable—they represent different grading philosophies. SHB emphasizes altitude/density, while AA emphasizes bean size.

How do physical grades relate to specialty scores?

This is the most misunderstood aspect of coffee grading. Physical grade and cupping score are two separate evaluations that together determine a coffee's market position.

Coffee Lot | Physical Grade | Cupping Score | Classification

Lot A | SHB (1,300m), Screen 17, 2 defects | 87 points | Specialty – High physical + high cup score

Lot B | SHG (1,100m), Screen 15, 4 defects | 83 points | Specialty – Acceptable physical + good cup score

Lot C | HB (800m), Screen 14, 8 defects | 78 points | Commercial – Low physical + low cup score

Lot D | SHB (1,400m), Screen 18, 1 defect | 76 points | Commercial – High physical but poor cup score (processing defect or variety issue)

The critical insight: A coffee cannot be classified as "Specialty Arabica" solely based on its physical grade. It must also score 80+ points during cupping. You can have a perfect SHB lot with zero defects that fails to reach 80 points—and it will be sold as commercial grade. Conversely, you can have a smaller-bean lot (e.g., Ethiopian Grade 2) that scores 89 points and is considered world-class specialty.

The defect count system in detail

Defects are categorized into two tiers under the SCA standard for a 350g green bean sample:

Primary Defects (Zero tolerance for Specialty grade):

Full black bean

Full sour bean

Insect-damaged bean (with >2 holes)

Fungus-damaged bean

Secondary Defects (≤5 allowed for Specialty grade):

Partial black/sour bean

Broken bean (chipped or damaged)

Shell bean (hollow, undeveloped)

Parchment bean (husk still attached)

Immature bean (under-ripe, small)

Quaker (unripe bean that doesn't roast evenly)

Each secondary defect counts as one "point," and the total must remain ≤5 for a lot to qualify for specialty export.

Beyond Arabica (OCC Coffee Guides)

Now, here is the game-changer: Fine Robusta is not graded using the traditional country-specific physical systems (SHB, Excelso, etc.), because traditional Robusta farming has never emphasized altitude or bean size. Instead, CQI's Fine Robusta protocol uses a unified physical standard applied globally:

Criterion | Fine Robusta Requirement | How It Differs from Arabica

Defect Count (350g) | ≤ 5 secondary defects; zero primary | Identical to Specialty Arabica—equally strict.

Screen Size | ≥ Screen 13 (minimum) | Less stringent—Robusta naturally produces smaller beans; size does not correlate with flavor as strongly as in Arabica.

Moisture | 9–12.5% | Identical to Arabica.

Altitude Consideration | Recommended 500m+ (but not mandatory) | More flexible—Fine Robusta can achieve 80+ points at medium elevations, whereas Arabica typically needs 1,000m+ for specialty status.

Cupping Score | ≥ 80 points (CQI Robusta protocol) | Adjusted sensory weight—body and crema are given higher priority; acidity is weighted lower.

At Origin Coffee Cambodia (OCC.), we apply both physical and sensory grading to every Fine Robusta lot we source. In our experience, a Fine Robusta scoring 84+ points from Vietnam's Cau Dat region (1,500m) can physically pass the same defect inspection as a specialty Arabica, yet offer an entirely different—and equally exciting—cup profile.

Here is our takeaway for coffee buyers: Never judge a coffee by its physical grade alone. The cupping score is the ultimate truth-teller. And with Fine Robusta now eligible for its own 80+ specialty classification, the old assumption that "grading systems belong only to Arabica" is officially obsolete. At Origin Coffee Cambodia (OCC.), we maintain a dual grading library—one for Arabica, one for Fine Robusta—ensuring that whichever species you choose, you are getting the absolute highest quality for your brewing method.

Origin Coffee Cambodia (OCC.) Coffee Guides: A Dual-Quality Future

For decades, the specialty coffee industry has operated under a single-species assumption—that "specialty" automatically means Arabica, and Robusta is by definition inferior. Origin Coffee Cambodia (OCC.) was founded to challenge that assumption.

In 2010, the Coffee Quality Institute (CQI) introduced the Fine Robusta standard, applying the same 100-point cupping protocol that defines Specialty Arabica to specialty-grade Robusta. To qualify as Fine Robusta, a lot must score 80+ points, have zero primary defects, and meet the same traceability and moisture requirements as Specialty Arabica. The only difference is sensory weighting: Fine Robusta rewards body and crema more heavily, while Specialty Arabica rewards acidity and floral complexity.

Origin Coffee Cambodia (OCC.) maintains two parallel quality libraries—one for Specialty Arabica (SCA Q-Grader protocol) and one for Fine Robusta (CQI R-Grader protocol)—and applies both to every lot we source. In blind triangulation tests, a 70/30 blend of Specialty Arabica and Fine Robusta frequently out-scores a 100% Arabica blend on mouthfeel, crema, and sweetness persistence.

The future of specialty coffee is species-agnostic. Whether you are an Arabica purist or a Fine Robusta explorer, the same rigorous quality standards apply. Origin Coffee Cambodia (OCC.) is the only knowledge hub that covers both protocols side-by-side.

Internal Resources from the Origin Coffee Cambodia (OCC.) Coffee Guides

The following guides expand on the dual Arabica / Fine Robusta framework:

What Is Arabica Coffee? – Flavor, origin, and quality of the world's most consumed species.

What Is Fine Robusta? – The complete introduction to specialty-grade Robusta.

Arabica vs Robusta: What's the Real Difference? – Side-by-side species comparison.

Arabica vs Fine Robusta: Quality, Flavor & Price – How specialty evaluation applies to both.

Arabica Flavor Wheel Explained – The SCA sensory vocabulary.

Arabica Coffee Grades Explained – Physical grading systems compared with Fine Robusta.

Arabica Coffee Processing – How processing methods shape both species.

Robusta Varieties – The genetic diversity of Coffea canephora.

Fine Robusta Standards Explained – The CQI protocol for specialty Robusta.

How Robusta Quality Is Evaluated – R-Grader protocol and cupping process.

Specialty Coffee vs Commercial Coffee – A Buyer's Guide – Quality economics explained.

Is Arabica Coffee Really Better? – A myth-busting comparison.

Related Guides

What Is Arabica Coffee? A Complete Guide (2026)

Arabica vs Robusta: What's the Real Difference?

Arabica vs Fine Robusta: Quality, Flavor & Price

Arabica Flavor Wheel Explained

Why Is Arabica Coffee More Expensive?

Is Arabica Coffee Really Better?