Ring Size Comparison Chart


US Standard (Also  Canada) Diameter in Inches British Equivalent French Equivalent German Equivalent Swiss Equivalent Japanese Equivalent
0 .454
1/2 A
1 .487 B 1
1 1/2 .503 C
2 .520 D 41 ½ 13 ¼ 1 ½ 2
2 1/2 .536 E 42 ¾ 13 ¾ 2 ¾ 3
3 .553 F 44 14 4 4
3 3/8 G 45 ½ 5 ½ 5
3 1/2 .569 14 ½
3 3/4 H 46 ½ 6 ½
4 .585 H ½ 15 7
4 1/4 I 47 ¾ 7 ¾
4 7/8 J 49 9
5 .618 J ½ 15 ¾ 9
5 1/8 K 50 10
5 1/2 .634 L 51 ¾ 16 11 ¾
6 .650 M 52 ¾ 16 ½ 12 ¾ 12
6 1/2 .666 N 54 17 14 13
7 .683 O 55 ¼ 17 ¼ 15 ¼ 14
7 1/4 .699 P 56 ½ 17 ¾ 16 ½ 15
8 .716 Q 57 ¾ 18 17 ¾ 16
8 1/2 .732 18 ½ 17
8 5/8 R 59 19
9 .748 19 18
9 1/8 S 60 ¼ 20 ¼
9 1/4 .764 19 ½ 19
9 5/8 T 61 ½ 21 ½
10 .781 T ½ 20 20
10 1/4 U 62 ¾ 22 ¾ 21
10 1/2 .797 U ½ 20 ¼ 22
10 5/8 V 63 ¾ 23 ¾
11 .814 V ½ 20 ¾ 23
11 1/8 W 65 25
11 1/2 .830 21 24
11 5/8 X 66 ¼ 26 ¼
12 .846 Y 67 ½ 21 ¼ 27 ½ 25
12 1/2 .862 Z 68 ¾ 21 ¾ 28 ¾ 26
13 .879 22 27

Ring Size Comparison Chart

Compliments of The International Gem Society