Ring Sizes

Our ring size
 in diameter mm

 Perimeter in mm USA/Canada UK EU ring size
15.0 47.1 4.2 H1/2 7.1
15.5 48.6 4.8 J 8.6
16.0 50.2 5.4 K1/2 10.2
16.5 51.8 6.0 L1/2 11.8
17.0 53.4 6.6 N 13.4
17.5 55.0 7.2 O 15.0
18.0 56.5 7.8 P1/2 16.5
18.5 58.1 8.4 R 18.1
19.0 59.7 9.0 S 19.7
19.5 61.2 9.6 T1/2 21.2
20.0 62.8 10.2 U1/2 22.8
20.5 64.4 10.8 W 24.4
21.0 66.0 11.4 X 26.0
21.5 67.5 12.0 Y1/2 27.5
22.0 69.1 12.6 Z1/2 29.1
22.5 70.7 13.2 Z+2 30.7
23.0 72.2 13.8 Z+3 32.2
23.5 73.8 14.4 Z+4 1/2 33.8