UK sizes to US sizes
Type a value in UK to get it in US instantly.
3.447US
That's 1.03× as big as a child’s ring, while an average women’s ring is 1.15× bigger. That is about 14.43 mm across the inside.
Convert the other way: US to UK
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 UK to US
Each scale steps differently: EU = circumference in mm, US = (circumference − 36.54) ÷ 2.55, and the diameter is the circumference divided by π.
Example: G UK = 3.44727 US.
Every unit
Your ring size in every system
Tables
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 |
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 |
Quick answers
Quick answers
- How many US is A UK?
- A UK is 0.494615 US.
- How many US is J UK?
- J UK is 4.9236 US.
- How many US is G UK?
- G UK is 3.44727 US.
The units
About these units
UK sizes (UK)
British sizing in letters, from A (37.8 mm round) up to Z and beyond, with half sizes such as N½.
US sizes (US)
American numeric sizes, stepping 2.55 mm of circumference each whole size.
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