US 11.5 to Japan ring size
US ring size 11.5 is Japan 24 — 20.98 mm inner diameter (65.9 mm circumference).
Your size is US 11.5 (UK W½, EU 66).
Fit confidence Exact table match
Measurement confidence 70/100 · Medium Standard chart conversion; final fit still depends on band width and knuckle shape. Confirm with a printable or physical sizer before ordering an expensive ring.
- US
- 11.5
- UK
- W½
- EU / ISO
- 66
- Japan
- 24
- CH / IT / ES
- 26
- Ø mm
- 20.98
- Circ mm
- 65.9
| US | UK | EU | JP | CH | Ø mm | 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 |
Nearby sizes
| US | Japan | Ø mm |
|---|---|---|
| 11 | 23 | 20.57 |
| 12 | 25 | 21.39 |
Frequently asked questions
What is US 11.5 in Japan ring size?
US ring size 11.5 is Japan 24 (inner diameter 20.98 mm, circumference 65.9 mm).
Is US 11.5 the same as Japan 24?
Yes — a US size 11.5 ring equals Japan 24. They are different scales for the same physical size (20.98 mm inner diameter).
Explore
Ring Size Conversions — All Systems & Sizes · Size 11.5 · See the full international ring size chart