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International ring size conversion chart

BEST VIEWED IN LANDSCAPE POSITION FOR PHONES
Inner Circum (mm) Inches UK/IE EU US FR CH Inner Diam (mm) JP DE
41 1.61 41 41 1 13.05
41.25 1.62 D 41 1/4 1 1/4 13.13
41.5 1.63 2 41 1/2 1 1/2 13.21
41.75 1.64 41 3/4 1 3/4 13.29 13 1/4
42 1.65 D 1/2 42 42 2 13.37 2
42.25 1.66 2 1/4 42 1/4 2 1/4 13.45
42.5 1.67 E 42 1/2 2 1/2 13.53 13 1/2
42.75 1.68 2 1/2 42 3/4 2 3/4 13.61
43 1.69 43 43 3 13.69 3
43.25 1.7 E 1/2 43 1/4 3 1/4 13.77 13 3/4
43.5 1.71 2 3/4 43 1/2 3 1/2 13.85
43.75 1.72 F 43 3/4 3 3/4 13.93
44 1.73 44 3 44 4 14.01 4 14
44.25 1.74 44 1/4 4 1/4 14.09
44.5 1.75 F 1/2 44 1/2 4 1/2 14.16
44.75 1.76 3 1/4 44 3/4 4 3/4 14.24 14 1/4
45 1.77 G 45 45 5 14.32 5
45.25 1.78 45 1/4 5 1/4 14.4
45.5 1.79 3 1/2 45 1/2 5 1/2 14.48 14 1/2
45.75 1.8 G 1/2 45 3/4 5 3/4 14.56
46 1.81 46 3 3/4 46 6 14.64 6
46.25 1.82 H 46 1/4 6 1/4 14.72 14 3/4
46.5 1.83 46 1/2 6 1/2 14.8
46.75 1.84 4 46 3/4 6 3/4 14.88
47 1.85 H 1/2 47 47 7 14.96 7 15
47.25 1.86 4 1/4 47 1/4 7 1/4 15.04
47.5 1.87 I 47 1/2 7 1/2 15.12
47.75 1.88 47 3/4 7 3/4 15.2
48 1.89 48 4 1/2 48 8 15.28 15 1/4
48.25 1.9 I 1/2 48 1/4 8 1/4 15.36 8
48.5 1.91 48 1/2 8 1/2 15.44
48.75 1.92 J 4 3/4 48 3/4 8 3/4 15.52 15 1/2
49 1.93 49 49 9 15.6
49.25 1.94 5 49 1/4 9 1/4 15.68 9
49.5 1.95 J 1/2 49 1/2 9 1/2 15.76 15 3/4
49.75 1.96 49 3/4 9 3/4 15.84
50 1.97 K 50 5 1/4 50 10 15.92
50.25 1.98 50 1/4 10 1/4 16 10 16
50.5 1.99 5 1/2 50 1/2 10 1/2 16.07
50.75 2 K 1/2 50 3/4 10 3/4 16.15
51 2.01 51 51 11 16.23 16 1/4
51.25 2.02 L 5 3/4 51 1/4 11 1/4 16.31 11
51.5 2.03 51 1/2 11 1/2 16.39
51.75 2.04 6 51 3/4 11 3/4 16.47 16 1/2
52 2.05 L 1/2 52 52 12 16.55
52.25 2.06 52 1/4 12 1/4 16.63 12
52.5 2.07 M 6 1/4 52 1/2 12 1/2 16.71 16 3/4
52.75 2.08 52 3/4 12 3/4 16.79
53 2.09 53 53 13 16.87
53.25 2.1 M 1/2 6 1/2 53 1/4 13 1/4 16.95
53.5 2.11 53 1/2 13 1/2 17.03 13 17
53.75 2.12 N 6 3/4 53 3/4 13 3/4 17.11
54 2.13 54 54 14 17.19
54.25 2.14 54 1/4 14 1/4 17.27 17 1/4
54.5 2.15 N 1/2 7 54 1/2 14 1/2 17.35 14
54.75 2.16 54 3/4 14 3/4 17.43
55 2.17 O 55 7 1/4 55 15 17.51 17 1/2
55.25 2.18 55 1/4 15 1/4 17.59
55.5 2.19 55 1/2 15 1/2 17.67 15
55.75 2.19 O 1/2 7 1/2 55 3/4 15 3/4 17.75 17 3/4
56 2.2 56 56 16 17.83
56.25 2.21 P 56 1/4 16 1/4 17.9
56.5 2.22 7 3/4 56 1/2 16 1/2 17.98 16 18
56.75 2.23 56 3/4 16 3/4 18.06
57 2.24 P 1/2 57 8 57 17 18.14
57.25 2.25 57 1/4 17 1/4 18.22 18 1/4
57.5 2.26 Q 57 1/2 17 1/2 18.3 17
57.75 2.27 8 1/4 57 3/4 17 3/4 18.38
58 2.28 58 58 18 18.46 18 1/2
58.25 2.29 Q 1/2 8 1/2 58 1/4 18 1/4 18.54
58.5 2.3 58 1/2 18 1/2 18.62
58.75 2.31 R 58 3/4 18 3/4 18.7 18
59 2.32 59 8 3/4 59 19 18.78 18 3/4
59.25 2.33 59 1/4 19 1/4 18.86
59.5 2.34 R 1/2 59 1/2 19 1/2 18.94
59.75 2.35 9 59 3/4 19 3/4 19.02 19 19
60 2.36 S 60 60 20 19.1
60.25 2.37 9 1/4 60 1/4 20 1/4 19.18
60.5 2.38 60 1/2 20 1/2 19.26 19 1/4
60.75 2.39 S 1/2 60 3/4 20 3/4 19.34 20
61 2.4 61 9 1/2 61 21 19.42
61.25 2.41 T 61 1/4 21 1/4 19.5 19 1/2
61.5 2.42 9 3/4 61 1/2 21 1/2 19.58
61.75 2.43 61 3/4 21 3/4 19.66 21
62 2.44 T 1/2 62 62 22 19.74 19 3/4
62.25 2.45 10 62 1/4 22 1/4 19.81
62.5 2.46 U 62 1/2 22 1/2 19.89
62.75 2.47 62 3/4 22 3/4 19.97 22 20
63 2.48 63 10 1/4 63 23 20.05
63.25 2.49 U 1/2 63 1/4 23 1/4 20.13
63.5 2.5 10 1/2 63 1/2 23 1/2 20.21 20 1/4
63.75 2.51 V 63 3/4 23 3/4 20.29
64 2.52 64 64 24 20.37 23
64.25 2.53 10 3/4 64 1/4 24 1/4 20.45
64.5 2.54 V 1/2 64 1/2 24 1/2 20.53 20 1/2
64.75 2.55 11 64 3/4 24 3/4 20.61
65 2.56 W 65 65 25 20.69 24
65.25 2.57 65 1/4 25 1/4 20.77 20 3/4
65.5 2.58 11 1/4 65 1/2 25 1/2 20.85
65.75 2.59 W 1/2 65 3/4 25 3/4 20.93
66 2.6 66 11 1/2 66 26 21.01 25 21
66.25 2.61 X 66 1/4 26 1/4 21.09
66.5 2.62 66 1/2 26 1/2 21.17
66.75 2.63 11 3/4 66 3/4 26 3/4 21.25 21 1/4
67 2.64 X 1/2 67 67 27 21.33 26
67.25 2.65 67 1/4 27 1/4 21.41
67.5 2.66 Y 12 67 1/2 27 1/2 21.49 21 1/2
67.75 2.67 67 3/4 27 3/4 21.57
68 2.68 68 12 1/4 68 28 21.65 27
68.25 2.69 Y 1/2 68 1/4 28 1/4 21.72 21 3/4
68.5 2.7 68 1/2 28 1/2 21.8
68.75 2.71 Z 12 1/2 68 3/4 28 3/4 21.88
69 2.72 69 69 29 21.96 28 22
69.25 2.73 12 3/4 69 1/4 29 1/4 22.04
69.5 2.74 Z 1/2 69 1/2 29 1/2 22.12
69.75 2.75 69 3/4 29 3/4 22.2
70 2.76 Z+1 70 13 70 30 22.28 22 1/4
70.25 2.77 70 1/4 30 1/4 22.36 29
70.5 2.78 70 1/2 30 1/2 22.44
70.75 2.79 Z+1 1/2 13 1/4 70 3/4 30 3/4 22.52 22 1/2
71 2.8 71 71 31 22.6
71.25 2.81 Z+2 71 1/4 31 1/4 22.68 30
71.5 2.81 13 1/2 71 1/2 31 1/2 22.76 22 3/4
71.75 2.82 71 3/4 31 3/4 22.84
72 2.83 Z+2 1/2 72 13 3/4 72 32 22.92
72.25 2.84 72 1/4 32 1/4 23 31 23
72.5 2.85 Z+3 14 72 1/2 32 1/2 23.08
72.75 2.86 72 3/4 32 3/4 23.16
73 2.87 73 73 33 23.24 23 1/4
73.25 2.88 Z+3 1/2 14 1/4 73 1/4 33 1/4 23.32 32
73.5 2.89 73 1/2 33 1/2 23.4
73.75 2.9 Z+4 73 3/4 33 3/4 23.48 23 1/2
74 2.91 74 14 1/2 74 34 23.55
74.25 2.92 74 1/4 34 1/4 23.63 33
74.5 2.93 Z+4 1/2 14 3/4 74 1/2 34 1/2 23.71
74.75 2.94 74 3/4 34 3/4 23.79 23 3/4
75 2.95 Z+5 75 75 35 23.87
75.25 2.96 15 75 1/4 35 1/4 23.95
75.5 2.97 75 1/2 35.5 24.03 34 24
75.75 2.98 Z+5 ½ 15 1/4 75 3/4 35 3/4 24.11
76 2.99 76 76 36 24.19
76.25 3 Z+6 76 1/4 36 1/4 24.27 24 1/4
76.5 3.01 15 1/2 76 1/2 36.5 24.35 35
76.75 3.02 76 3/4 36 3/4 24.43
77 3.03 Z+6 ½ 77 15 3/4 77 37 24.51 24 1/2
77.25 3.04 77 1/4 37 1/4 24.59
77.5 3.05 Z+7 77 1/2 37.5 24.67 36
77.75 3.06 16 77 3/4 37 3/4 24.75 24 3/4
78 3.07 78 78 38 24.83
78.25 3.08 Z+7 ½ 78 1/4 38 1/4 24.91
78.5 3.09 16 1/4 78 1/2 38.5 24.99 37 25
78.75 3.1 Z+8 78 3/4 38 3/4 25.07
79 3.11 79 16 1/2 79 39 25.15
79.25 3.12 79 1/4 39 1/4 25.23 25 1/4
79.5 3.13 Z+8 ½ 79 1/2 39.5 25.31 38
79.75 3.14 16 3/4 79 3/4 39 3/4 25.39
80 3.15 Z+9 80 80 40 25.46 25 1/2
80.25 3.16 17 80 1/4 40 1/4 25.54
80.5 3.17 80 1/2 40.5 25.62
80.75 3.18 Z+9 ½ 80 3/4 40 3/4 25.7 39
81 3.19 81 17 1/4 81 41 25.78 25 3/4
81.25 3.2 Z+10 81 1/4 41 1/4 25.86

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