Introduction:Pour over coffee enthusiasts are no doubt familiar with specialty coffee beans from African origins, which are renowned for their bright acidity and floral-fruit aromas. But when faced with labels such as Ethiopian G1 or Kenyan AA, many wonder: where do these grading standards come from? In fact, each African country employs its own independent grading system. This article takes an in-depth look at the differences between Ethiopia and Kenya—two major producing regions—and explores everything from defect rates to bean size to help you master the key factors in selecting high-quality coffee beans.
For consumers who love pour over coffee, specialty beans from African origins are undoubtedly highlights on the flavor wheel. These highland-grown beans often exhibit unique citrus-toned acidity and layered floral notes, making them a recommended entry choice for many baristas. However, when you see a bag labeled “Ethiopian G1” or “Kenyan AA” at a specialty coffee shop, have you ever wondered about the scoring logic behind these grades? In reality, each of Africa’s major coffee-producing countries follows its own independent grading system, which is entirely different from the evaluation criteria used in the Americas or Asia.
Taking the two well-known origins in East Africa as examples, Kenya and Ethiopia, though neighboring countries, have developed distinctly different quality grading mechanisms. The grading of Kenyan coffee prioritizes the physical characteristics of the beans, especially the size of green beans before roasting. Among them, Grade E (Elephant bean) is considered a special specification—these abnormally large beans have a diameter exceeding 18 mesh (approximately 8 mm). However, due to their rare production and higher processing difficulty, they have a very low proportion in market circulation. The mainstream Grade AA commonly seen in the market is defined as uniformly sized beans within the 17 to 18 mesh range. This size range is believed to strike a balance between even extraction and flavor expression.
In contrast to Kenya’s focus on external specifications, Ethiopia’s grading standard places more emphasis on the intrinsic quality of the green beans. The country uses a defect bean counting method. Specifically: when a 300-gram sample contains fewer than 3 defect beans, it can be classified as the top-tier G1 grade. This standard is stricter than the Specialty Coffee Association of America’s (SCAA) recommended benchmark for specialty coffee (fewer than 5 defects per 300 grams), and even more so than the International Coffee Organization (ICO) guideline (fewer than 5 defects/300g). The next grade down, G2, allows for 4 to 12 defect beans per 300 grams, and is typically used for commercial-grade or blended coffee products. It’s worth noting that “defect beans” include various types such as black beans, insect-damaged beans, and underripe beans. Professional cuppers classify and calculate them according to strict charts.
This difference in scoring methods directly influences consumer purchasing strategies. If you prefer a pour over experience with bright fruit acidity and high cleanliness, it is recommended to prioritize Ethiopian beans of the G1 grade—their strict defect control ensures a clear and defined flavor profile during brewing. Meanwhile, Kenyan AA grade is suitable for drinkers who enjoy a fuller body and grapefruit-like notes; the larger beans, when ground to the appropriate size, can showcase a rich sweet aftertaste. It should be noted that some traders may mix international grading terminology, so it’s important to confirm the specific grading definitions of the origin country when making a purchase.
Understanding the processing methods of each origin can also affect the final flavor profile. For example, Ethiopia’s common natural (sun-dried) processing method can enhance berry-like characteristics, while Kenya’s widely used double-fermentation washed process helps highlight notes of blackcurrant and tomato acidity. These post-harvest processing methods, together with the inherent grading standards, collectively contribute to the unique charm of African coffee—a detail worth paying attention to when selecting your coffee bag.
The above content is compiled by CoffeeHunters, a coffee news website.
