27 Jan '18, 4am
Coffee Terms - Bean Classification and Grading
Grade is generally used to indicate coffee bean size, which is associated with coffee quality. While there are many exceptions, coffee beans grown at higher elevations tend to be denser, larger, and have better flavor. The process of determining coffee bean size, or grading, is done by passing unroasted beans through perforated containers, or sieves. For example, Grade 18 beans, also called AA, will pass through a sieve with 18/64" diameter holes, but are retained by the next smaller sieve with 16/64" diameter holes. Traditionally, even grades were used for Arabicas (20, 18, 16, etc), and odd numbers were used for Robustas (17, 15, 13, etc). The method of grading coffee (classifying coffee quality) varies by country, and may include bean size, bean density, number of defects, growing altitude, taste, etc.