International Ring Size Conversion Table

US & Canada UK & Australian French & Russian German Japanese Swiss
3 F - F 1/2 44 14 4 4
3.25 F 3/4 - G 45 - 5 5
3.5 G 1/4 - G 1/2 - 14 1/2 6 5.5
3.75 H - H 1/4 46 - - 6
4 H 1/2 - H 3/4 - 15 7 7
4.25 I - I 1/4 47 - - -
4.5 I 1/2 - J 48 - 8 8
4.75 J 1/4 49 15 1/2 - 9
5 J 1/2 - K - - 9 -
5.25 K 1/4 - K 1/2 50 - 10 10
5.5 K 3/4 - L 51 16 - 11
5.75 L 1/4 - L 1/2 - - 11 -
6 L 3/4 - M 1/4 52 16 1/2 12 12
6.25 M 1/2 - M 3/4 53 - - 13
6.5 N - N 1/4 - 17 13 14
6.75 N 1/2 - N 3/4 54 - - -
7 O - O 1/4 - - 14 -
7.25 O 1/2 - O 3/4 55 17 1/2 - 15
7.5 P - P 1/4 56 - 15 16
7.75 P 1/2 - P 3/4 - - - -
8 Q - Q 1/4 57 18 16 17
8.25 Q 1/2 58 - - 18
8.5 Q 3/4 - R - 18 1/2 17 -
8.75 R 1/4 - R 1/2 59 - - 19
9 R 3/4 - S - 19 18 -
9.25 S 1/4 - S 1/2 60 - - 20
9.5 S 3/4 - T 61 19 1/2 19 21
9.75 T 1/4 62 - - -
10 T 1/2 - T 3/4 - 20 20 22
10.25 U - U 1/4 63 - 21 23
10.5 U 1/2 - V - - 22 -
10.75 V 1/4 64 20 1/2 - 24
11 V 1/2 - W 65 - 23 -
11.25 W 1/4 - W 1/2 66 - - 25
11.5 W 3/4 - X - 21 24 26
11.75 X 1/4 - X 1/2 67 - - -
12 Y - Y 1/4 - 21 1/2 25 27
12.25 Y 1/2 - Y 3/4 68 - - 28
12.5 Z - Z 1/4 69 - 26 -
12.75 Z+1/2 - Z+3/4 - 22 - 29
13 Z+1 70 - 27 30
13.25 - - - - -
13.5
Z+1.5
71 22 1/2 - 31
13.75 Z+2 - - - 32
14 Z+3 72 23 - -
14.25 - 73 - - 33
14.5 Z+4 - 23 1/2 - -
14.75 - 74 - - 34
15 Z+5 75 24 - 35
15.5 Z+6 - 24 1/1 - 36
16 Z+7 - - - 37