International conversions Nov 16, 2026 3 min read
Ring Size Conversion: US to Japan
Japanese ring sizes use Goh numbering 1-30. US 7 ≈ JP 14. Roughly Japanese number = US × 2.
The Chart
| US | JP (Goh) | EU (mm) |
|---|---|---|
| 4 | 7 | 47 |
| 5 | 9 | 49 |
| 6 | 12 | 51 |
| 7 | 14 | 54 |
| 8 | 16 | 57 |
| 9 | 18 | 59 |
| 10 | 20 | 61 |
| 11 | 22 | 64 |
| 12 | 24 | 66 |
| 13 | 27 | 69 |
FAQs
Why JP uses Goh?
Goh (号) is a Japanese unit translating to 'size number'. Used for rings, ring molds, and jewelry sizing throughout Japan and parts of East Asia.
Korean vs Japanese ring sizing?
Korea uses similar Goh-style numbering but the scale differs slightly. Korean ring 14 ≠ Japanese 14. Always check the chart for the specific brand's country of origin.
Need this on your store?
Tailor Size Guide ships pre-built size charts for Shopify.