Japan to US ring size
Convert a Japan ring size to US — instantly, and with the exact millimetre diameter so you can order with confidence.
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Your size is US 7 (UK N½, EU 54).
Measurement check Exact table match
Measurement check Discrete Japan size matched against the canonical chart. Confirm with a second measuring method before buying.
- US
- 7
- UK
- N½
- EU / ISO
- 54
- Japan
- 14
- CH / IT / ES
- 14
- Inner diameter, millimetres
- 17.32
- Circ mm
- 54.4
Why this size?
Your input maps to US 7 — UK N½, EU 54, JP 14, Ø 17.32 mm.
Calculated dimensions are rounded chart values, not a measured accuracy guarantee. Ruler placement, print scale, screen calibration and the finger can change the result. Confirm with a physical sizer before ordering.
More options
Choose the fit problem and get the safest next step before resizing, replacing or buying another ring.
Wide band or comfort-fit Non-resizable or brand ring Smart-ring fit issue Too loose or spinning
| US | UK | EU | JP | CH | Inner diameter, millimetres | Circ mm |
|---|---|---|---|---|---|---|
| 3 | F½ | 44 | 4 | 4 | 14.07 | 44.2 |
| 3.5 | G½ | 45 | 5 | 5 | 14.48 | 45.5 |
| 4 | H½ | 47 | 7 | 7 | 14.88 | 46.8 |
| 4.5 | I½ | 48 | 8 | 8 | 15.29 | 48.0 |
| 5 | J½ | 49 | 9 | 9 | 15.70 | 49.3 |
| 5.5 | K½ | 51 | 10 | 11 | 16.10 | 50.6 |
| 6 | L½ | 52 | 12 | 12 | 16.51 | 51.9 |
| 6.5 | M½ | 53 | 13 | 13 | 16.92 | 53.1 |
| 7 | N½ | 54 | 14 | 14 | 17.32 | 54.4 |
| 7.5 | O½ | 56 | 15 | 16 | 17.73 | 55.7 |
| 8 | P½ | 57 | 16 | 17 | 18.14 | 57.0 |
| 8.5 | Q½ | 58 | 17 | 18 | 18.54 | 58.3 |
| 9 | R½ | 60 | 18 | 20 | 18.95 | 59.5 |
| 9.5 | S½ | 61 | 19 | 21 | 19.35 | 60.8 |
| 10 | T½ | 62 | 20 | 22 | 19.76 | 62.1 |
| 10.5 | U½ | 63 | 22 | 23 | 20.17 | 63.4 |
| 11 | V½ | 65 | 23 | 25 | 20.57 | 64.6 |
| 11.5 | W½ | 66 | 24 | 26 | 20.98 | 65.9 |
| 12 | Y | 67 | 25 | 27 | 21.39 | 67.2 |
| 12.5 | Z | 68 | 26 | 28 | 21.79 | 68.5 |
| 13 | Z½ | 70 | 27 | 30 | 22.20 | 69.7 |
Japan-to-US conversion chart
| Japan | US | Inner diameter, millimetres | Circ mm |
|---|---|---|---|
| 4 | 3 | 14.07 | 44.2 |
| 5 | 3.5 | 14.48 | 45.5 |
| 7 | 4 | 14.88 | 46.8 |
| 8 | 4.5 | 15.29 | 48.0 |
| 9 | 5 | 15.70 | 49.3 |
| 10 | 5.5 | 16.10 | 50.6 |
| 12 | 6 | 16.51 | 51.9 |
| 13 | 6.5 | 16.92 | 53.1 |
| 14 | 7 | 17.32 | 54.4 |
| 15 | 7.5 | 17.73 | 55.7 |
| 16 | 8 | 18.14 | 57.0 |
| 17 | 8.5 | 18.54 | 58.3 |
| 18 | 9 | 18.95 | 59.5 |
| 19 | 9.5 | 19.35 | 60.8 |
| 20 | 10 | 19.76 | 62.1 |
| 22 | 10.5 | 20.17 | 63.4 |
| 23 | 11 | 20.57 | 64.6 |
| 24 | 11.5 | 20.98 | 65.9 |
| 25 | 12 | 21.39 | 67.2 |
| 26 | 12.5 | 21.79 | 68.5 |
| 27 | 13 | 22.20 | 69.7 |
Frequently asked questions
How do I convert a Japan ring size to US?
Enter your Japan size in the converter above, or find it in the chart below and read across to the US column. Both use the same canonical chart on Ringsizely.
Are Japan and US ring sizes the same?
No — they use different scales, so the numbers do not match and must be converted. International equivalents are approximate; when possible, order by millimetre diameter.
How should I confirm a converted ring size before ordering?
Measure the same finger or a ring that fits with a second method. For an expensive, wide, or non-resizable ring, check the retailer's chart and confirm with a physical sizer or jeweller.
Explore
See the full international ring size chart · Ring Size Conversions — All Systems & Sizes · EU→US
Values computed from the US jewellers’ diameter scale and cross-checked against ISO 8653 — methodology last reviewed 2026-08-27. Methodology