Coffee Beans Classification by screensize

In order to determine bean size, coffee is filtered through a perforated screen.

1. Screen sizes vary from screen 20 (very large bean) to screen 9 (small peaberry bean).
2. Each screen size is equal to 1/64th of an inch. 
3. Bean size can be referred to either by screen size (ex: screen 17) or by name (ex. Large bean).

The table of conversion below illustrates terms used in describing sizes of coffee beans.