π Japanese Ring Size Converter
Convert US, UK, and EU ring sizes to Japanese sizing. Find your perfect fit for Japanese jewelry.
Ring Size Conversion Chart
| US/Canada | UK/Australia | EU | Japan | Diameter (mm) |
|---|---|---|---|---|
| 3 | F | 44 | 5 | 14.1 |
| 4 | H | 47 | 7 | 14.9 |
| 5 | J | 49 | 9 | 15.7 |
| 6 | L | 52 | 11 | 16.5 |
| 7 | N | 54 | 13 | 17.3 |
| 8 | P | 57 | 15 | 18.2 |
| 9 | R | 59 | 17 | 19.0 |
| 10 | T | 62 | 19 | 19.8 |
| 11 | V | 64 | 21 | 20.6 |
| 12 | X | 67 | 23 | 21.4 |
Understanding Japanese Ring Sizes
Japanese ring sizes use a number system based on the ring's inner diameter in millimeters. Japanese sizes are typically odd numbers (5, 7, 9, 11, etc.).
How to Measure Your Ring Size
- Existing Ring Method: Measure inner diameter of well-fitting ring in mm
- String Method: Wrap string around finger, mark overlap, measure length in mm
- Professional Sizing: Visit jewelry store for precise measurement
π Quick Tip:
Most Japanese jewelry stores offer free professional ring sizing. They use precise sizing tools for accuracy.
Common Japanese Ring Sizes
- Women's Average: Size 9-13 (US 5-7)
- Men's Average: Size 15-19 (US 8-10)
- Engagement Rings: Typically size 9-11 for women
Shopping for Rings in Japan
- Japanese ring sizes may differ slightly between brands
- Always ask for precise measurement before purchasing
- Consider ring width - wider bands may need larger size
- Temperature affects finger size - measure when hands are warm