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Table of Comparative Ring-Size Equivalents for the Jewelry Trade.
International table of comparative Ring-Size Equivalents used in the jewelry trade for United States including Canada, British and French gauge measurements. Also includes German, Japanese and Swiss ring size equivalents.

United States Standard including Canada Average Diameter in Inches British Equivalent French Equivalent German Equivalent Japanese Equivalent Swiss Equivalent
000 0.39
00 0.422
0 0.454
1/2 A
3/4 A - 1/2
1 0.487 B 1
1 1/4 B - 1/2
1 1/2 0.503 C
1 3/4 C - 1/2
2 0.52 D 41 1/2 13 1/4 2 1 1/2
2 1/4 D - 1/2
2 1/2 0.536 E 42 3/4 13 3/4 3 2 3/4
2 3/4 E - 1/2
3 0.553 F 44 14 4 4
3 1/8 F - 1/2
3 3/8 G 45 1/4 5 5 1/4
3 1/2 0.569 14 1/2
3 5/8 G - 1/2 6
3 3/4 H 46 1/2 6 1/2
4 0.585 H - 1/2 15 7
4 1/4 I 47 3/4 7 3/4
4 1/2 0.601 I - 1/2 15 1/4 8
4 7/8 J 49 9
5 0.618 J - 1/2 15 3/4 9
5 1/8 K 50 10
5 3/8 K - 1/2 10
5 1/2 0.634 L 51 3/4 16 11 3/4
5 7/8 L - 1/2 11
6 0.65 M 52 3/4 16 1/2 12 12 3/4
6 1/4 M - 1/2
6 1/2 0.666 N 54 17 13 14
6 3/4 N - 1/2
7 0.683 O 55 1/4 17 1/4 14 15 1/4
7 1/4 O - 1/2
7 1/2 0.699 P 56 1/2 17 3/4 15 16 1/2
7 3/4 P - 1/2
8 0.716 Q 57 3/4 18 16 17 3/4
8 1/4 Q -1/2
8 1/2 0.732 18 1/2 17
8 5/8 R 59 19
8 7/8 R - 1/2
9 0.748 19 18
9 1/8 S 60 1/4 20 1/4
9 3/8 S - 1/2
9 1/2 0.764 19 1/2 19
9 5/8 T 61 1/2 21 1/2
10 0.781 T - 1/2 20 20
10 1/4 U 62 3/4 21 22 3/4
10 1/2 0.797 U - 1/2 20 1/4 22
10 5/8 V 63 3/4 23 3/4
11 0.814 V - 1/2 20 3/4 23
11 1/8 W 65 25
11 3/8 W - 1/2
11 1/2 0.83 21 24
11 5/8 X 66 1/4 26 1/4
11 7/8 X - 1/2
12 0.846 Y 67 1/2 21 1/4 25 27 1/2
12 1/4 Y - 1/2
12 1/2 0.862 Z 68 3/4 21 3/4 26 28 3/4
12 3/4 Z - 1/2
13 0.879 22 27

 

 
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