Kenya Coffee Bean Grading System Explained

If you’ve ever wondered why some Kenyan coffees command premium prices or seen terms like SHB or EPW on a bag, you’re not alone. The Kenya Coffee Board uses a detailed, multi-factor system to classify beans — and understanding it helps you buy smarter. This guide breaks down how Kenyan coffee is officially graded, from bean size and elevation to defect counts and cup quality.

In short: Kenyan coffee is graded first by bean size using screen numbers (e.g., 18–20+ for large beans), then by growing altitude (SHB for heights of 4,500+ feet), and finally by defect count and cup taste testing. Higher altitude and larger, cleaner beans usually mean higher grade and better cup potential.

How Kenyan Coffee Beans Are Sized and Screened

Kenya grades its coffee beans primarily by physical size using numbered mesh screens (or ‘filter screen numbers’). These screen sizes indicate the minimum diameter a bean must be to fall into a certain grade. The larger the bean, the higher the number — and often, the higher the market value.

Peaberry beans — where a single rounded bean forms instead of two flat beans — are also graded separately. In Kenya, peaberries often receive special processing attention and may command a premium due to their rarity and concentrated flavors.

Kenya Coffee Grades by Growing Altitude

Beyond bean size, altitude plays a major role in determining coffee grade in Kenya. Higher elevations slow bean development, increasing density, acidity, and sweetness. The Kenya Coffee Board officially assigns seven altitude-based grades:

As a rule, the higher the elevation (and grade), the more complex and vibrant the cup — and the higher the price due to farming challenges and increased transport costs.

Defect Counting and Cup Quality Evaluation

Kenya employs a rigorous defect-based quality assessment system. Using statistical sampling, inspectors count the types and numbers of foreign matter, insect damage, discolored or broken beans — collectively called ‘defects.’ The lower the defect count, the higher the bean’s graded quality.

Beyond physical inspection, Kenyan coffee also undergoes official taste testing. Each producing region has its own sensory evaluation protocol, and only batches that pass these cupping evaluations are approved for export. This ensures that graded Kenyan coffee meets minimum flavor standards — a key reason why Kenya consistently scores well in international cuppings.

Frequently Asked Questions

What do screen numbers mean in Kenyan coffee grading?

Screen numbers in Kenya refer to the minimum mesh size (in millimeters) that a coffee bean must pass through to qualify for a certain grade. For example, a screen 18 bean is larger than a screen 15 bean. Flat beans sized 20–29 are considered extra-large or ‘very large,’ while peaberries sized 11–13 are graded separately.

What is the highest grade of Kenyan coffee?

The highest grade is S.H.B. (Strictly High Grown or Strictly Hard Bean), grown at elevations above 4,500 feet. These beans are denser, often have more complex cup profiles, and command premium prices due to both quality and growing difficulty.

Does Kenya grade peaberry coffee differently?

Yes. Peaberry beans — where a single round bean replaces the usual pair of flat beans — are graded on a separate scale. In Kenya, peaberries of screen size 13–12 are considered large, 11 is nearly large, 10 is normal, 9 is medium, and 8 is small. They are often processed and sold separately.

How does altitude affect Kenyan coffee grading?

Altitude is a key factor. Kenya classifies coffee into seven grades based on growing elevation, with S.H.B. (above 4,500 feet) being the highest. Higher-altitude coffee tends to be denser, sweeter, and more acidic — qualities that improve cup quality and justify higher grades.

Is defect counting part of Kenya’s official coffee grading?

Yes. A set percentage of defects — such as black beans, broken beans, or foreign material — is allowed per grade. The fewer the defects found in a sample, the higher the coffee is graded. This is assessed alongside physical sizing and cup quality tests.

Why does Kenyan coffee go through taste testing before export?

Every batch is cupped as part of official quality control. Different regions follow specific sensory protocols, and only those passing taste evaluations are cleared for export. This ensures consistency and quality in the global market.

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