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Ring Sizes

United States size Avg. diameter in inches Length in inches British equivalent French equivalent German equivalent Japanese equivalent Swiss equivalent
000 .390 --- --- --- --- --- ---
00 .422 --- --- --- --- --- ---
0 .454 1.429 --- --- --- --- ---
1/2 --- --- A --- --- --- ---
3/4 --- --- A-1/2 --- --- --- ---
1 .487 1.528 B --- --- 1 ---
1-1/4 --- --- B-1/2 --- --- --- ---
1-1/2 .503 --- C --- --- --- ---
1-3/4 --- --- C-1/2 --- --- --- ---
2 .520 1.632 D 41-1/2 13-1/2 2 1-1/2
2-1/4 --- --- D-1/2 --- --- --- ---
2-1/2 .536 --- E 42-3/4 13-3/4 3 2-3/4
2-3/4 --- --- E-1/2 --- --- --- ---
3 .553 1.735 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 .569 ---   --- 14-1/2 --- ---
3-5/8 --- --- G-1/2 --- --- 6 ---
3-3/4 --- --- H 46-1/2 --- --- 6-1/2
4 .585 1.835 H-1/2 --- 15 7 ---
4-1/4 --- --- I 47-3/4 --- --- 7-3/4
4-1/2 .601 --- I-1/2 --- 15-1/4 8 ---
4-5/8 --- --- J 49 --- --- 9
5 .618 1.943 J-1/2 --- 15-3/4 9 ---

 

United States size Avg. diameter in inches Length in inches British equivalent French equivalent German equivalent Japanese equivalent Swiss equivalent
5-1/8 --- --- K 50 --- --- 10
5-3/8 --- --- K-1/2 --- --- 10 ---
5-1/2 .634 --- L 51-3/4 16 --- 11-3/4
5-7/8 --- --- L-1/2 --- --- --- ---
6 .650 2.045 M 52-3/4 16-1/2 12 12-3/4
6-1/4 --- --- M-1/2 --- --- --- ---
6-1/2 .666 --- N 54 --- 13 14
6-3/4 --- --- N-1/2 --- 17 --- ---
7 .683 2.15 O 55-1/4 17-1/4 14 15-1/4
7-1/4 --- --- O-1/2 --- --- --- ---
7-1/2 .699 --- P 56-1/2 --- 15 16-1/2
7-3/4 --- --- P-1/2 --- --- --- ---
8 .716 2.25 Q 57-3/4 18 16 17-3/4
8-1/4 --- --- Q-1/2 --- --- --- ---
8-1/2 .732 --- --- --- --- 17 ---
8-5/8 --- --- R 59 --- --- 19
8-7/8 --- --- R-1/2 --- --- --- ---
9 .748 2.35 --- --- 19 18 ---
9-1/8 --- --- S 60-1/4 --- --- 20-1/4
9-3/8 --- --- S-1/2 --- --- --- ---
9-1/2 .764 --- --- --- 19-1/2 19 ---
9-5/8 --- --- T 61-1/2 --- --- 21-1/2
10 .781 2.46 T-1/2 --- 20 20 ---
10-1/4 --- --- U 62-3/4 --- 21 22-3/4
10-1/2 .797 --- U-1/2 --- 20-1/4 22 ---

 

United States size Avg. diameter in inches Length in inches British equivalent French equivalent German equivalent Japanese equivalent Swiss equivalent
10-5/8 --- --- V 63 --- --- 23-3/4
11 .814 2.56 V-1/2 --- 20-3/4 23 ---
11-1/8 --- --- W 65 --- --- 25
11-3/8 --- --- W-1/2 --- --- --- ---
11-1/2 .830 --- --- --- 21 24 ---
11-5/8 --- --- X 66-1/4 --- --- 26-1/4
11-7/8 --- --- X-1/2 --- --- --- ---
12 .846 2.63 Y 67-1/2 21-1/4 25 27-1/2
12-1/4 --- --- Y-1/2 --- --- --- ---
12-1/2 .862 --- Z 68-3/4 21-3/4 26 28-3/4
12-5/8 --- --- Z-1/2 --- --- --- ---
13 .879 2.76 --- --- 22 27 ---