US sizes to UK sizes
Type a value in US to get it in UK instantly.
NUK
That's 1.05× as big as an average women’s ring, while an average men’s ring is 1.1× bigger. That is about 17.32 mm across the inside.
Convert the other way: UK to US
What it means
How big is that ring?
Measure a ring that fits across its inside, or wrap a strip of paper around the finger. Fingers swell in heat, so measure warm.
The math
How to convert US to UK
Each scale steps differently: EU = circumference in mm, US = (circumference − 36.54) ÷ 2.55, and the diameter is the circumference divided by π.
Example: 7 US = N UK.
Every unit
Your ring size in every system
Tables
US to UK conversion table
| US | UK |
|---|---|
| 3 US | F UK |
| 4 US | H UK |
| 5 US | J UK |
| 6 US | L UK |
| 7 US | N UK |
| 8 US | P½ UK |
| 9 US | R½ UK |
| 10 US | T½ UK |
| 11 US | V½ UK |
| 12 US | X½ UK |
| 13 US | Z½ UK |
UK to US conversion table
| UK | US |
|---|---|
| C UK | 1.47883 US |
| D UK | 1.97094 US |
| E UK | 2.46305 US |
| F UK | 2.95516 US |
| G UK | 3.44727 US |
| H UK | 3.93938 US |
| I UK | 4.43149 US |
| J UK | 4.9236 US |
| K UK | 5.4157 US |
| L UK | 5.90781 US |
| M UK | 6.39992 US |
Quick answers
Quick answers
- How many UK is 1 US?
- 1 US is B UK.
- How many UK is 10 US?
- 10 US is T½ UK.
- How many UK is 7 US?
- 7 US is N UK.
The units
About these units
US sizes (US)
American numeric sizes, stepping 2.55 mm of circumference each whole size.
UK sizes (UK)
British sizing in letters, from A (37.8 mm round) up to Z and beyond, with half sizes such as N½.
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