Sizing · 尺码

International Ring Size Guide

Lucky Jewellery lists ring sizes in UK sizing. If you are more familiar with US, European or Chinese ring sizes, please use the chart below as an approximate guide. Ring size conversion may vary slightly between jewellers, so we recommend checking the inner diameter or circumference wherever possible.

UK Size	US Size	EU Size	China Size	Inner Diameter (mm)	Inner Circumference (mm)
J	5	49	9	15.7	49.3
K	5.5	50	10	16.0	50.3
L	6	51	12	16.5	51.8
M	6.5	52	13	16.9	53.1
N	7	54	14	17.3	54.4
O	7.5	55	15	17.7	55.7
P	8	57	16	18.1	57.0
Q	8.5	58	17	18.5	58.3
R	9	59	18	19.0	59.7
S	9.5	61	20	19.4	60.9
T	10	62	21	19.8	62.1
U	10.5	63	22	20.2	63.4
V	11	64	23	20.6	64.7
W	11.5	66	24	21.0	66.0
X	12	67	25	21.4	67.2
Y	12.5	68	26	21.8	68.5
Z	13	70	27	22.2	69.7

UK Size
J
Ø 15.7 mm
◯ 49.3 mm
US
5
EU
49
CN
9
UK Size
K
Ø 16.0 mm
◯ 50.3 mm
US
5.5
EU
50
CN
10
UK Size
L
Ø 16.5 mm
◯ 51.8 mm
US
6
EU
51
CN
12
UK Size
M
Ø 16.9 mm
◯ 53.1 mm
US
6.5
EU
52
CN
13
UK Size
N
Ø 17.3 mm
◯ 54.4 mm
US
7
EU
54
CN
14
UK Size
O
Ø 17.7 mm
◯ 55.7 mm
US
7.5
EU
55
CN
15
UK Size
P
Ø 18.1 mm
◯ 57.0 mm
US
8
EU
57
CN
16
UK Size
Q
Ø 18.5 mm
◯ 58.3 mm
US
8.5
EU
58
CN
17
UK Size
R
Ø 19.0 mm
◯ 59.7 mm
US
9
EU
59
CN
18
UK Size
S
Ø 19.4 mm
◯ 60.9 mm
US
9.5
EU
61
CN
20
UK Size
T
Ø 19.8 mm
◯ 62.1 mm
US
10
EU
62
CN
21
UK Size
U
Ø 20.2 mm
◯ 63.4 mm
US
10.5
EU
63
CN
22
UK Size
V
Ø 20.6 mm
◯ 64.7 mm
US
11
EU
64
CN
23
UK Size
W
Ø 21.0 mm
◯ 66.0 mm
US
11.5
EU
66
CN
24
UK Size
X
Ø 21.4 mm
◯ 67.2 mm
US
12
EU
67
CN
25
UK Size
Y
Ø 21.8 mm
◯ 68.5 mm
US
12.5
EU
68
CN
26
UK Size
Z
Ø 22.2 mm
◯ 69.7 mm
US
13
EU
70
CN
27

This chart is an approximate guide only. Ring fit can be affected by band width, finger shape, knuckle size, temperature and personal comfort preference. For wide rings, customers may need to choose a slightly larger size.

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