Round seed beads and cylinder beads are sized according to numbers called aught sizes. The most common sizes you will find at bead shops and online are 15/0 (smallest), followed by 11/0, 10/0, 8/0, 6/0 and 5/0 (largest, also sometimes called an “E” bead). The size may also be written with the number followed by what looks like a degree symbol.
When seed beads were first being manufactured, the standard size bead was referred to as the “null” or “aught” bead. No one knows for sure how the sizes were developed, but it is believed that they were numbered according to how many beads could be lined up side by side in the space of one inch. Accordingly, the larger the number, the smaller the seed bead.
It is also helpful to know that some shaped seed beads such as triangle beads, cubes and bugle beads do not necessarily hold to the aught sizing system. Bugle beads, for instance, are usually sized according to their length in millimeters and noted as a pound sign (#) followed by a number. Cubes beads are usually just labeled according to their size in millimeters, and triangle beads are either labeled with aught sizes or with a system similar to that of the bugle beads.
By Jennifer VanBenschoten, About.com Guide
When seed beads were first being manufactured, the standard size bead was referred to as the “null” or “aught” bead. No one knows for sure how the sizes were developed, but it is believed that they were numbered according to how many beads could be lined up side by side in the space of one inch. Accordingly, the larger the number, the smaller the seed bead.
It is also helpful to know that some shaped seed beads such as triangle beads, cubes and bugle beads do not necessarily hold to the aught sizing system. Bugle beads, for instance, are usually sized according to their length in millimeters and noted as a pound sign (#) followed by a number. Cubes beads are usually just labeled according to their size in millimeters, and triangle beads are either labeled with aught sizes or with a system similar to that of the bugle beads.
By Jennifer VanBenschoten, About.com Guide
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