UK to US ring size
Convert a UK ring size to US — 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 74/100 · Medium Discrete UK size matched against the canonical chart. Check the same size with a printable or physical sizer if the ring cannot be resized.
- 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 |
UK-to-US conversion chart
| UK | US | Ø mm | Circ mm |
|---|---|---|---|
| F½ | 3 | 14.07 | 44.2 |
| G½ | 3.5 | 14.48 | 45.5 |
| H½ | 4 | 14.88 | 46.8 |
| I½ | 4.5 | 15.29 | 48.0 |
| J½ | 5 | 15.70 | 49.3 |
| K½ | 5.5 | 16.10 | 50.6 |
| L½ | 6 | 16.51 | 51.9 |
| M½ | 6.5 | 16.92 | 53.1 |
| N½ | 7 | 17.32 | 54.4 |
| O½ | 7.5 | 17.73 | 55.7 |
| P½ | 8 | 18.14 | 57.0 |
| Q½ | 8.5 | 18.54 | 58.3 |
| R½ | 9 | 18.95 | 59.5 |
| S½ | 9.5 | 19.35 | 60.8 |
| T½ | 10 | 19.76 | 62.1 |
| U½ | 10.5 | 20.17 | 63.4 |
| V½ | 11 | 20.57 | 64.6 |
| W½ | 11.5 | 20.98 | 65.9 |
| Y | 12 | 21.39 | 67.2 |
| Z | 12.5 | 21.79 | 68.5 |
| Z½ | 13 | 22.20 | 69.7 |
Frequently asked questions
What is UK N½ in US ring size?
UK N½ is US 7 (inner diameter 17.32 mm, circumference 54.4 mm).
How do I convert a UK ring size to US?
Enter your UK size in the converter above, or find it in the chart below and read across to the US column. Both use one dataset verified against ISO 8653.
Are UK 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.
Explore
See the full international ring size chart · Ring Size Conversions — All Systems & Sizes · EU→US