International Ring Size Conversion Chart
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1
2International Ring size conversion chart
European
US Ring size measurements in
UK Ring size measurements in
Ring size
millimetres
millimetres
ISO 8653
Inner
Inner
Inner
Inner
Standard
Size
Diameter
Circumference
Size
Diameter
Circumference
(mm)
(mm)
(mm)
(mm)
(mm)
41.25
41
1¾
13.06
41.02
D
13.13
41.88
41.7
2
13.26
41.66
D½
13.33
42.50
42.3
2¼
13.46
42.29
E
13.53
43.13
42.9
2½
13.66
42.92
E½
13.73
43.75
43.6
2¾
13.87
43.56
F
13.93
44.38
44.2
3
14.07
44.20
F½
14.13
45.00
44.9
3¼
14.27
44.86
G
14.32
45.63
45.5
3½
14.48
45.49
G½
14.52
46.25
46.1
3¾
14.68
46.13
H
14.72
46.88
46.8
4
14.88
46.76
H½
14.92
47.50
47.4
4¼
15.09
47.40
I
15.12
48.13
48
4½
15.29
48.03
I½
15.32
48.7
4¾
15.49
48.67
J
15.52
48.75
49.38
49.3
5
15.7
49.33
J½
15.72
50.00
50
5¼
15.9
49.96
K
15.92
50.63
50.6
5½
16.1
50.60
K½
16.11
51.25
51.2
5¾
16.31
51.23
L
16.31
51.88
51.9
6
16.51
51.87
L½
16.51
52.50
52.5
6¼
16.71
52.50
M
16.71
53.13
53.1
6½
16.92
53.14
M½
16.91
53.75
53.8
6¾
17.12
53.77
N
17.11
54.38
54.4
7
17.32
54.43
N½
17.31
55.00
55.1
7¼
17.53
55.07
O
17.51
55.63
55.7
7½
17.73
55.70
O½
17.71
56.25
56.3
7¾
17.93
56.34
P
17.9
56.88
57
8
18.14
56.97
P½
18.1
57.50
57.6
8¼
18.34
57.61
Q
18.3
58.13
58.3
8½
18.54
58.25
Q½
18.5
58.75
58.9
8¾
18.75
58.89
R
18.7
59.38
59.5
9
18.95
59.53
R½
18.9
60.00
60.2
9¼
19.15
60.17
S
19.1
60.63
60.8
9½
19.35
60.80
S½
19.3
61.25
61.4
9¾
19.56
61.44
T
19.5
61.88
62.1
10
19.76
62.08
T½
19.7
62.50
62.7
10¼
19.96
62.72
U
19.89
63.13
63.4
10½
20.17
63.36
U½
20.09
63.75
64
10¾
20.37
64.00
V
20.29
64.38
64.6
11
20.57
64.64
V½
20.49
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