Grading System & Price Guide
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Frequently Asked Questions
What is Ethiopian Grade 1 (G1) coffee?
Ethiopian Grade 1 is the highest specialty grade, with only 0–3 defects per 300g sample and an SCA cup score of 85+. It is extremely rare — only the best lots from Yirgacheffe, Guji, and a few other origins reach this level. G1 commands premiums of 40–60% above standard commercial coffee.
What is the difference between Kenya AA and AB?
Kenya AA uses screen size 17–18 (6.70–7.14mm) and commands a 30% premium over base price. Kenya AB mixes screen A and B (smaller beans, 15–16 screen) and is priced about 15% above base. AA is Kenya's flagship export grade, but AB often rivals it in cup quality, making it better value for many specialty roasters.
How many kilograms of cherries does it take to make 1 kg of green coffee?
About 5 kg of fresh cherries produce 1 kg of washed (wet-processed) green beans — the 5:1 ratio. For natural (dry) processing, the ratio is roughly 3.5:1 because the cherry is dried whole and loses weight more efficiently without added water. This conversion ratio is critical for calculating farm revenues.
Why is Uganda Africa's second largest coffee exporter?
Uganda produces about 370,000 tonnes of coffee annually, around 70% of which is Robusta from the Lake Victoria basin. Favorable climate, low-cost production, and UCDA export infrastructure make it highly competitive in the commodity segment. Ugandan Robusta is in high demand for commercial espresso blends globally.
What is the potato defect in Rwandan and Burundian coffee?
The 'potato defect' (PD) is a raw potato-like smell in the cup caused by pyrazine compounds from Antestia bug damage to coffee cherries. It is unique to the Great Lakes region. Integrated pest management (IPM) targeting Antestia bugs can reduce the defect by 50–80%, dramatically improving cup score and price.
How do I move my coffee from Grade 4 to Grade 2 in Ethiopia?
The most impactful steps: (1) Selective picking — only harvest fully red ripe cherries; (2) Flotation sorting — float cherries in water to remove defective beans; (3) Fermentation control — ferment exactly 36–48 hours, then wash thoroughly; (4) Raised bed drying — dry on African raised beds to 10.5–11.5% moisture; (5) Proper storage — store parchment cool and dry, re-mill within 3 months. These steps alone can move most Ethiopian lots from G4 to G2.
African Coffee: A $4 Billion Export Industry
Africa is the birthplace of coffee. Ethiopia's Kaffa region is where Coffea arabica was first discovered, and today the continent produces over 1.5 million tonnes per year — roughly 15% of global supply. Ethiopia leads arabica production with 500,000+ tonnes, Uganda dominates in robusta with 370,000 tonnes, and Côte d'Ivoire rounds out the top three. The continent's unique highland ecosystems, diverse processing traditions, and varietals found nowhere else in the world make African coffees the most sought-after origins in the specialty market.
Why Grading Matters for Farmer Revenue
The difference between selling Grade 4 and Grade 1 Ethiopian coffee is not 10% — it is 50% in price per kilogram. For a 2-hectare farm producing 600 kg of green beans per year, that gap represents over $2,400 in lost annual income. Understanding your country's grading system — whether Ethiopia's defect-based scale, Kenya's screen size auction, or Rwanda's washing station certification — is the first step to capturing the value your coffee deserves.
Specialty vs. Commercial: The Two Markets
African coffee occupies both markets. Ethiopia and Kenya have deeply established specialty pipelines with direct trade relationships, Cup of Excellence competitions, and buyer visits to farms. Uganda and Côte d'Ivoire are primarily commercial origins traded in bulk on commodity exchanges. Rwanda and Burundi are in transition — investing heavily in washing station infrastructure and SCA cupping programs to shift premium lots into the specialty segment where prices are 2–3× higher.
The Processing Decision: Washed, Natural, or Honey
Processing method profoundly affects both cup profile and price. Washed coffees are cleaner, brighter, and easier to grade to specialty standards. Natural coffees — where the cherry is dried whole — are more labor-intensive to quality-control, but the best naturals from Ethiopia's Harrar and Yirgacheffe command significant premiums for their intense berry and wine-like notes. The honey process, a hybrid, offers a middle ground and is gaining popularity in East Africa.