How to measure your ring size

To work out your ring size measure the circumference of the finger in millimetres using a piece of thread or thin string. Check that a ring of this size will pass over the joint. Use the table below to work out the UK ring size you need. Also, you can use the table to convert from US to UK ring size.

The measurements in the table are to the nearest half millimetre - realistically the smallest unit you will be able to measure using this method.

If you would like a free ring gauge then click here.

Circumference mm UK ring size US ring size European ring size
37.5 A 1/2
38 A 1/2
39 B 1
39.5 B 1/2
40 C 1 1/2
41 C 1/2 1
41.5 D 2
42 D 1/2 2
42.5 E 2 1/2
43 E 1/2 3
44 F 3 4
44.5 F 1/2
45 G 3 1/2 5
45.5 G 1/2
46 H 4 6
47 H 1/2 7
47.5 I 4 1/2
48 I 1/2 8
48.5 J
49 J 1/2 5 9
50 K 10
50.5 K 1/2 5 1/2
51 L 11
51.5 L 1/2 6
52 M 12
53 M 1/2 6 1/2 13
53.5 N
54 N 1/2 7 14
54.5 O
55.5 O 1/2 7 1/2
56 P 16
56.5 P 1/2 8
57 Q 17
58 Q 1/2 8 1/2 18
58.5 R
58 28
59 R 1/2 9 19
60 S 20
60.5 S 1/2 9 1/2
61 T 21
62 T 1/2 10 22
62.5 U
63 U 1/2 10 1/2 23
63.5 V
64 24
64.5 V 1/2 11
65 W 25
65.5 W 1/2 11 1/2
66 X 26
66.5 X 1/2 12
67 27
67.5 Y
68 Y 1/2 28
68.5 Z 12 1/2
69 29
69.5 Z 1/2
70 Z+1 13 30
71 31
71.5 Z+2 13 1/2
72 32
72.5 Z+3 14
73 33
74 Z+4 14 1/2 34
75 Z+5 15 35
76 36
76.5 Z+6 15 1/2
77 37
78 Z+7 16 38