Size Studio
UK Ring Size N in US, EU and mm
A UK (and Australian) ring size N is about a US 6.75 and an EU 54, with an inside diameter of about 17.1 mm (53.8 mm around).
| US / CA | UK / AU | EU (ISO) | Japan | Inside diameter | Inside circumference |
|---|---|---|---|---|---|
| 6.75 | N | 54 | 13 | 17.1 mm | 53.8 mm |
Good to know
- EU (ISO) ring sizes are the inside circumference in millimetres. US sizes go up about 0.8 mm in diameter per whole size, UK letters about 0.4 mm.
- Fingers swell when warm. Measure at the end of the day, and go half a size up for wide bands.
Sizes either side
Smaller: MLarger: OOpen the full converterHow to measure yourself
Questions
What is ring size N in mm?
About 17.1 mm inside diameter, 53.8 mm around.
What is UK ring size N in US?
About US 6.75.
What is ring size N in EU?
EU 54.
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