International Sizes - Ring Conversion Chart


U.S. Size BritishFrench German Japan Swiss Dia inch Dia MM Metric
0000 - - - - -.390 9.91 -
00 - - - - - .42210.73 -
0 - - - - - .45410.73 -
1/2 A - - - - .47412.18 -
3/4 A 1/2 - - - - .48210.73 -
1 B - - 1 -.48712.3738.9
1 1/4B 1/2 - - - - -10.73 39.6
1 1/2 C - - - - .50312.76 40.2
1 3/4C 1/2 - - - - - 13.0040.8
2d 41 1/2 12 1/2 2 1 1/2 .52013.2141.5
2 1/4D 1/2 - - - - -13.4142.1
2 1/2E 42 3/4 13 3/4 3 2 3/4 .53613.61 42.7
2 3/4 E 1/2 - - - - -13.83 43.4
3 F 44 14 4 4 .533 14.0544.0
3 1/8 F 1/2 - - - - - 14.1544.3
3 1/4 - - - - - - 14.2544.6
3 3/8 G 45 1/4 - 5 5 1/4 - 14.3644.9
3 1/2 - - 14.5 - - .569 14.4545.2
3 5/8 G 1/2 - - 6 - - 14.5645.6
3 3/4 H 46 1/2 - - 6 1/2- 14.65 45.9




U.S. Size BritishFrench German Japan Swiss Dia inch Dia MM Metric
4 H 1/2 - 15 7 -.585 14.85 46.5
4 1/4 I 47 3/4 - - 7 3/4- 15.04 47.1
4 1/2 I 1/2 - 15 1/4 8 -.601 15.27 47.8
4 5/8J 492 15 1/2 - 9- 15.40 48.1
4 3/4- - - - -- 15.53 48.4
5 J 1/2 - 15 3/4 9 -.61815.70 49.0
5 1/8 K 50 - - 10- 15.80 49.3
5 1/4- - - - -- 15.90 49.6
5 3/8K 1/2 - - 10 - . 16.00 50.0
5 1/2L 51 3/4 16 - 11 3/4 .634 16.10 50.3
5 3/4- - - - -- 16.30 50.9
5 7/8 L 1/2 - - - -- 16.41 51.3
6 M 52 3/4 16 1/2 12 12 3/4.650 16.51 51.5
6 1/4 M 1/2 - - - - - 16.71 52.2
6 1/2 N 54 17 13 14 .666 16.92 52.8
6 3/4 N 1/2 - - - - - 17.13 53.4
7 O 55 1/4 17 1/4 14 15 14.683 17.35 54
7 1/4 O 1/2 - - - - - 17.45 54.7
7 1/2 P 56 1/2 17 3/4 15 16 1/2.699 17.75 55.3
7 3/4 P 1/2 - - - - - 17.97 55.9
8 Q 57 3/4 18 16 17.34 .716 18.19 56.6
8 1/4 Q 1/2 - - - - - 18.35 57.2
8 1/2 - - 18.5 17 - .732 18.53 57.8



U.S. Size BritishFrench German Japan Swiss Dia inch Dia MM Metric
8 5/8 R 59 - - 19 - 18.61 58.4
8 3/4 - - - - - - 18.69 58.4
8 7/8 R 1/2 1/2 - - - - - 18.80 59.0
9 - - 19 18 - - 18.89 59.1
9 1/8 S 60 1/4 - - 20 1/4 - 19.10 59.4
9 1/4 - - - - - - 19.22 59.7
9 3/8 S 1/2 - - - - - 19.31 60.0
9 1/2 - - 19 1/2 19 - .764 19.41 60.3
9 5/8 T 61 1/2 - - 21 1/2 - 19.51 60.6
9 3/4 - - - - - - 19.62 60.9
10 T 1/2 - 20 20 - .781 19.84 61.6
10 1/4 U 62 3/4 - 21 22 3/4 - 20.02 62.2
10 1/2 U 1/2 - 20 1/4 22 - .797 20.20 62.8
10 5/8 V 63 - - 23 3/4 - 20.32 63.1
10 3/4 - - - - - - 20.44 63.5
11 V 1/2 - 20 3/4 23 - .814 20.68 64.1
11 1/8 W 65 - - 25 - 20.76 64.3
11 1/4 - - - - - - 20.85 64.7
11 3/8 W 1/2 - - - - - 20.944 65.0
11 1/2 - - 21 24 - - 21.08 65.3
11 5/8 X 66 1/4 - - 26 1/4 .830 21.18 65.7
11 3/4 - - - - - - 21.24 66.0
11 7/8 X 1/2 - - - - - 21.30 66.3
12 Y 67 1/2 21 1/4 25 27 1/2 .846 21.49 66.6


U.S. Size BritishFrench German Japan Swiss Dia inch Dia MM Metric
12 1/4 Y 1/2 - - - - - 21.69 67.2
12 1/2 Z 68 3/4 21 3/4 26 28 3/4 .862 21.89 67.9
12 3/4 Z 1/2 - - - - - 22.10 68.5
13 - - 22 27 - .879 22.33 69.1


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