RING SIZE GUIDE

Diameter (mm)  UK EU US
13.3 D 42 1.75
13.5 D 1/2 42.5 2
13.7  E 43.5 2.25
13.9 E 1/2 44 2.5
14.1 F 44.5 2.75
14.3 F 1/2 45  3
14.5 G 45.5 3.25
14.7  G 1/2 46 3.5
14.9 H 47 3.75
15.1 H 1/2 47.5 4
15.3  48 4.25
15.5  I 1/2 48.5 4.5
15.7 J 49.5 4.75
15.9 J 1/2 50 5
16.1 50.5 5.25
16.3  K 1/2  51 5.5
16.5 52 5.75
16.7 L 1/2 52.5 6
16.9  M 53 6.25
17.1 M 1/2 54 6.5
17.3 N 54.5 6.75
17.5 N 1/2 55  7
17.7 O 55.75 7.25
17.9 O 1/2 56.25 7.5
18.1 P 57 7.75
18.3 P 1/2  57.25  8
18.5 58  8.25
18.7  Q 1/2 58.5 8.5
18.9  R 59.5 8.75
19.1 R 1/2 60 9
19.3  S 60.5 9.25
19.5 S 1/2 61.25 9.5
19.7 62 9.75
19.9 T 1/2 62.5 10
20.1 U 63 10.25
20.3  U 1/2 64 10.5
20.5  V 64.25 10.75
20.7    V 1/2 65  11
20.9 W 65.5 11.25