What are Coffee Screen Sizes?
Screen size is a physical measurement of green coffee beans using standardized perforated screens. Each screen has a specific diameter, usually measured in 1/64-inch increments, allowing beans to be sorted by size. For example, a “16 screen” indicates beans that pass through a 16/64-inch opening.
Screen size does not directly indicate cup quality, but it often correlates with bean density, uniformity, and potential for even roasting. Larger beans are frequently more mature and denser, while smaller beans may be underdeveloped or unevenly processed.
Why Screen Sizes Matter
Roasting consistency
Uniform screen sizes allow heat to transfer evenly across the batch, reducing the risk of tipping or uneven development. Mixing significantly different sizes can result in overdeveloped or underdeveloped beans in the same roast.
Grading and sorting
Screen sizes are part of grading standards in many origins, often linked to defect counts and preparation categories like EP. They provide a baseline for lot classification and export specifications.
Traceability and lot differentiation
Screen sizes can help roasters understand a lot’s processing and farm practices. Larger, consistent beans may indicate careful cherry selection and optimal drying, whereas mixed or small beans can signal variability in harvest or processing.
Where Nordic Approach Fits In
We monitor screen size consistency during cupping and origin visits, evaluating how lot preparation and sizing influence roast performance and cup clarity. While we do not physically sort beans ourselves, understanding screen size distribution helps us identify lots that will perform predictably in roasting and deliver consistent specialty-quality profiles.
FAQ About Coffee Screen Sizes
Q1: Does a larger screen size always mean better coffee?
A1: Not necessarily. Larger beans often correlate with density and maturity, but cup quality depends on harvest, processing, and varietal characteristics as well.
Q2: How is screen size measured?
A2: Beans are passed through a series of perforated screens, each with a defined opening in 1/64-inch increments, and classified by the largest screen they pass through.
Q3: How does screen size affect roasting?
A3: Uniform sizes ensure even heat transfer, reducing uneven development and helping preserve flavour clarity and balance in the cup.