UK Ring Size to European (EU) Size Chart

To convert a UK ring size to a European size, find the UK letter in the chart below and read the EU number beside it. UK N½ is EU 54, UK L½ is EU 52 and UK T½ is EU 62. The EU number is the inner circumference of the ring in millimetres, rounded.

UK to EU Ring Size Chart

UK size	EU size	US size	Inner diameter (mm)	Inner circumference (mm)
F	44	3	14.07	44.2
G	45	3.5	14.47	45.5
H	47	4	14.88	46.8
I	48	4.5	15.29	48.0
J½	49	5	15.69	49.3
K½	51	5.5	16.10	50.6
L½	52	6	16.51	51.9
M½	53	6.5	16.91	53.1
N½	54	7	17.32	54.4
O½	56	7.5	17.73	55.7
P½	57	8	18.13	57.0
Q½	58	8.5	18.54	58.2
R½	60	9	18.95	59.5
S½	61	9.5	19.35	60.8
T½	62	10	19.76	62.1
U½	63	10.5	20.16	63.3
V½	65	11	20.57	64.6
W½	66	11.5	20.98	65.9
X½	67	12	21.38	67.2
Z	68	12.5	21.79	68.5
Z½	70	13	22.20	69.7

EU size equals circumference in mm, following ISO 8653:2016 as summarised on Wikipedia. For the UK letters alone, see the UK ring size chart, and for every system see the ring size conversion chart.

EU Ring Size to UK Size (EU 44 to 70)

If you start from a European number, use this lookup. The exact US size shows how close each EU number is to a half size.

EU size	Exact US size	Nearest US size	Nearest UK size
44	2.92	3	F
45	3.31	3.5	G
46	3.71	3.5	G
47	4.10	4	H
48	4.49	4.5	I
49	4.88	5	J½
50	5.27	5.5	K½
51	5.66	5.5	K½
52	6.06	6	L½
53	6.45	6.5	M½
54	6.84	7	N½
55	7.23	7	N½
56	7.62	7.5	O½
57	8.01	8	P½
58	8.41	8.5	Q½
59	8.80	9	R½
60	9.19	9	R½
61	9.58	9.5	S½
62	9.97	10	T½
63	10.36	10.5	U½
64	10.76	11	V½
65	11.15	11	V½
66	11.54	11.5	W½
67	11.93	12	X½
68	12.32	12.5	Z
69	12.71	12.5	Z
70	13.10	13	Z½

What an EU Ring Size Measures

An EU size is the length of the inner circle of the ring. A ring with a 54.4 mm inner circumference is EU 54. That is why you can measure your finger with a paper strip and read the EU size directly from a ruler.

[INFOGRAPHIC: insert infographic_eu_size_circumference.webp]

Alt text: A ring with an inner circumference unrolled to 54.4 mm beside a ruler, labelled EU 54, UK N½, US 7

Caption: The EU number is the unrolled inner circumference in mm.

Buying From a UK or European Shop

1. Find your size in one system using the how to measure your ring size guide.
2. Convert it with the chart above.
3. Check the shop’s own size chart, because brands round differently.
4. If you fall between sizes, read finding the perfect fit in between ring sizes.

You can also print a sizer from the printable ring size chart or compare US values on the US ring size chart.

Frequently Asked Questions

What is UK ring size N½ in European size?

UK N½ has an inner circumference of about 54 mm, so it is EU 54 and US 7.

What is ring size 54 in US and UK?

EU 54 is US size 7 and UK N½. The inner circumference is 54 mm.

What UK ring size is EU 52?

EU 52 is UK L½ and US 6 (exact US 6.06).

Why does a UK size from another site look different?

Published UK tables disagree slightly. This chart pairs each UK letter with the closest inner diameter in the BS 6820 table, so US 6 shows as L½ and US 10 as T½. Older charts that show L and T for those sizes use a different pairing. Check the retailer’s own chart if a half-size difference matters.

Is EU size the same as Swiss or German size?

Not always. This page uses the ISO 8653 convention, where the EU size equals the inner circumference in mm. Some countries number differently, so compare with the Swiss ring size chart before ordering.

How do I find my EU size without a ring?

Wrap a paper strip around your finger, mark the overlap and measure the length in mm. That number is your circumference. Read the mm to ring size chart or the cm chart.