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Ring Size Converter
US, UK, EU and Japanese ring sizes with diameter.
7
US
N½
UK
54
EU (ISO)
14
Japan
17.3 mm
Diameter
54.4 mm
Circumference
| US | UK | EU (ISO) | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 4 | H½ | 47 | 7 | 14.9 mm | 46.8 mm |
| 4.5 | I½ | 48 | 8 | 15.3 mm | 48 mm |
| 5 | J½ | 49 | 9 | 15.7 mm | 49.3 mm |
| 5.5 | K½ | 51 | 10 | 16.1 mm | 50.6 mm |
| 6 | L½ | 52 | 12 | 16.5 mm | 51.9 mm |
| 6.5 | M½ | 53 | 13 | 16.9 mm | 53.1 mm |
| 7 | N½ | 54 | 14 | 17.3 mm | 54.4 mm |
| 7.5 | O½ | 56 | 15 | 17.7 mm | 55.7 mm |
| 8 | P½ | 57 | 16 | 18.1 mm | 57 mm |
| 8.5 | Q½ | 58 | 17 | 18.5 mm | 58.2 mm |
| 9 | R½ | 60 | 18 | 18.9 mm | 59.5 mm |
| 9.5 | S½ | 61 | 19 | 19.4 mm | 60.8 mm |
| 10 | T½ | 62 | 20 | 19.8 mm | 62.1 mm |
| 10.5 | U½ | 63 | 22 | 20.2 mm | 63.3 mm |
| 11 | V½ | 65 | 23 | 20.6 mm | 64.6 mm |
| 11.5 | W½ | 66 | 24 | 21 mm | 65.9 mm |
| 12 | Y | 67 | 25 | 21.4 mm | 67.2 mm |
| 12.5 | Z | 68 | 26 | 21.8 mm | 68.5 mm |
| 13 | Z+1 | 70 | 27 | 22.2 mm | 69.7 mm |
Runs entirely in your browser. Nothing is sent anywhere.
How it works
- 1Enter a value.
- 2Pick the units to convert between.
- 3Read the converted value instantly.
About this tool
Ring Size Converter: US, UK, EU and Japanese ring sizes with diameter. Enter a value and it is converted instantly using exact conversion factors. The table below lists common values for quick reference.
Example
| Input | |
|---|---|
| US size | 7 |
| Result | |
| US | 7 |
| UK | N½ |
| EU (ISO) | 54 |
| Japan | 14 |
| Diameter | 17.3 mm |
| Circumference | 54.4 mm |
How do I use the Ring Size Converter?
Enter a value. Pick the units to convert between. Read the converted value instantly.
Is the Ring Size Converter free?
Yes. It is completely free with no sign-up, no usage limits and no watermark.
Is my data sent to a server?
No. Everything is calculated locally in your browser. Nothing you enter is uploaded, logged or stored.
Does it work on my phone?
Yes. It works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux — no app needed.