How to measure a paper roll

You need three parameters to describe a paper roll size: Width, Diameter (or Length), and Core.

For example, for 80mm x 70mm x 12mm thermal paper, the paper roll width is 80mm, the diameter is 70mm, and the core is 12 mm.

Most American countries usually describe a paper roll size as “Width x Length x Core.” For example, 3 1/8″ x 230′ x 7/16″ paper roll means the paper roll width is 3 1/8″, the length is 230′, and the core is 7/16″.

You can read this article to know more explanation about paper roll sizes. And if you want to know the mathematical relationship between a paper roll’s diameter and length, you can check this link.