US to UK ring size
Convert a US ring size to UK — instantly, and with the exact millimetre diameter so you can order with confidence.
Your size is US 7 (UK N½, EU 54).
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
- 7
- UK
- N½
- EU / ISO
- 54
- Japan
- 14
- CH / IT / ES
- 14
- Ø mm
- 17.32
- Circ mm
- 54.4
| 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 |
US-to-UK conversion chart
| US | UK | Ø mm | Circ mm |
|---|---|---|---|
| 3 | F½ | 14.07 | 44.2 |
| 3.5 | G½ | 14.48 | 45.5 |
| 4 | H½ | 14.88 | 46.8 |
| 4.5 | I½ | 15.29 | 48.0 |
| 5 | J½ | 15.70 | 49.3 |
| 5.5 | K½ | 16.10 | 50.6 |
| 6 | L½ | 16.51 | 51.9 |
| 6.5 | M½ | 16.92 | 53.1 |
| 7 | N½ | 17.32 | 54.4 |
| 7.5 | O½ | 17.73 | 55.7 |
| 8 | P½ | 18.14 | 57.0 |
| 8.5 | Q½ | 18.54 | 58.3 |
| 9 | R½ | 18.95 | 59.5 |
| 9.5 | S½ | 19.35 | 60.8 |
| 10 | T½ | 19.76 | 62.1 |
| 10.5 | U½ | 20.17 | 63.4 |
| 11 | V½ | 20.57 | 64.6 |
| 11.5 | W½ | 20.98 | 65.9 |
| 12 | Y | 21.39 | 67.2 |
| 12.5 | Z | 21.79 | 68.5 |
| 13 | Z½ | 22.20 | 69.7 |
Frequently asked questions
What is US 7 in UK ring size?
US 7 is UK N½ (inner diameter 17.32 mm, circumference 54.4 mm).
How do I convert a US ring size to UK?
Enter your US size in the converter above, or find it in the chart below and read across to the UK column. Both use one dataset verified against ISO 8653.
Are US and UK 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.
Explore
See the full international ring size chart · Ring Size Conversions — All Systems & Sizes · EU→US