Japan Ring Size to US Ring Size Converter
Welcome to our Japan Ring Size to US Ring Size Converter! This tool bridges two distinct ring sizing systems in Japan and the United States.
Japan’s ring sizes are generally numbered from 1 to 27, including only integers. In contrast, US ring sizes use a scale of numbers and half/quarter sizes. Our converter is here to simplify the variation between these two systems. It is aimed to make your international ring shopping hassle-free and ensure a perfect fit every time.
Japan Ring Size to US Ring Size Chart
Here is the conversion chart we use in the converter:
| Japan Ring Size | US Ring Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|
| 1 | 1.5 – 1.75 | 13.0 | 40.8 |
| 2 | 2 – 2.25 | 13.3 | 41.9 |
| 3 | 2.5 – 2.75 | 13.6 | 42.9 |
| 4 | 2.75 – 3 | 14.0 | 44.0 |
| 5 | 3.25 – 3.5 | 14.3 | 45.0 |
| 6 | 3.5 – 3.75 | 14.6 | 46.1 |
| 7 | 4 – 4.25 | 15.0 | 47.1 |
| 8 | 4.5 – 4.75 | 15.3 | 48.2 |
| 9 | 4.75 – 5 | 15.6 | 49.2 |
| 10 | 5.25 – 5.5 | 16.0 | 50.3 |
| 11 | 5.75 – 6 | 16.3 | 51.3 |
| 12 | 6 – 6.25 | 16.6 | 52.4 |
| 13 | 6.5 – 6.75 | 17.0 | 53.4 |
| 14 | 7 – 7.25 | 17.3 | 54.5 |
| 15 | 7.25 – 7.5 | 17.6 | 55.5 |
| 16 | 7.75 – 8 | 18.0 | 56.6 |
| 17 | 8 – 8.25 | 18.3 | 57.6 |
| 18 | 8.5 – 8.75 | 18.6 | 58.6 |
| 19 | 9 – 9.25 | 19.0 | 59.7 |
| 20 | 9.25 – 9.5 | 19.3 | 60.7 |
| 21 | 9.75 – 10 | 19.6 | 61.8 |
| 22 | 10.25 – 10.5 | 20.0 | 62.8 |
| 23 | 10.5 – 10.75 | 20.3 | 63.9 |
| 24 | 11 – 11.25 | 20.6 | 64.9 |
| 25 | 11.5 – 11.75 | 21.0 | 66.0 |
| 26 | 11.75 – 12 | 21.3 | 67.0 |
| 27 | 12.25 – 12.5 | 21.6 | 68.0 |
