Ring Size Guide
| Ring Size US | Internal Diameter (inches) | Circumference (inches) |
|---|---|---|
| 5 | 0,618 in | 1,94 in |
| 6 | 0,655 in | 2,06 in |
| 7 | 0,682 in | 2,14 in |
| 8 | 0,709 in | 2,23 in |
| 9 | 0,736 in | 2,31 in |
| 10 | 0,764 in | 2,40 in |
| 11 | 0,791 in | 2,48 in |
How the US Standard Works
Sizes are sequential numbers, typically ranging from 3 to 13 for adults.
Each 0.5 size increment corresponds to a fixed increase in both diameter and circumference.
The progression is linear and nationally standardized, and it is used by jewelers, manufacturers, and e-commerce platforms.
Technical Increments
The internal diameter increases by approximately 0.032 inches per full size.
The internal circumference increases by approximately 0.10 inches per full size.