International Ring Size Conversion Chart Table

Inside Diameter US UK Germany Spain France Italy Japan
14 mm 3 F 44 (14.0) 4 44 4 4
14.5 mm 3.5 G N/A N/A N/A 5,5 5
15 mm 4 H 47 (15.0) 6,5 46.5 7 7
15.3 mm 4.5 I 48 (15.3) 8 48 8 8
15.6 mm 5 J 49 (15.6) 9,5 49.5 9 9
16.2 mm 5.5 K 51 (16.2) 10,5 50.5 10 10
16.6 mm 6 L 52 (16.6) 12 52 11 11
16.9 mm 6.5 M 53 (16.9) 13,5 53 12,5 13
17.2 mm 7 N 54 (17.2) 14,5 54.5 14 14
17.8 mm 7.5 O 56 (17.8) 16 55.5 15 15
18.1 mm 8 P 57 (18.1) 17 57 16 16
18.5 mm 8.5 Q 58 (18.5) 18,5 58 17,5 17
19.1 mm 9 R 60 (19.1) 20 59.5 19 18
19.4 mm 9.5 S 61 (19.4) 21 61 20 19
19.7 mm 10 T 62 (19.7) 22,5 62 21,5 20
20.4 mm 10.5 U 64 (20.4) 23,5 63.5 23 22
20.7 mm 11 V 65 (20.7) 25 64.5 24 23
21.0 mm 11.5 W 66 (21.0) 26 66 25 24
21.6 mm 12 X 68 (21.6) 27,5 67 26,5 25
22.0 mm 12.5 Y 69 (22.0) 29 68.5 28 26
22.3 mm 13 Z 70 (22.3) 30 69.5 28,5 27
22.9 mm 13.5 Z+2 72 (22.9) 32 71 32 N/A
23.2 mm 14 Z+3 73 (23.2) 33 72.5 33 N/A
23.6 mm 14.5 Z+4 74 (23.6) 34,5 73.5 N/A N/A
  15 Z+5 N/A 35 75 35 N/A