J&I Size Guide

  • Have an existing ring that fits, simply measure the inside diameter of the ring and match to find your ring size in the chart below
  • Knowing your ring size but not in Australian size, convert it by the chart below

Please use the chart below to find your ring size.

Inside Diameter (mm) Inside Circumference (mm) AU / UK Size US Size
13.1 41.1 D -
13.3 41.7 D 1/2 2
13.5 42.4 E -
13.7 43 E 1/2 2.5
13.9 43.6 F -
14.1 44.2 F 1/2 3
14.3 44.9 G -
14.5 45.5 G 1/2 3 1/2
14.7 46.1 H -
14.9 46.8 H 1/2 4
15.1 47.4 I -
15.3 48 I 1/2 4 1/2
15.5 48.6 J -
15.7 49.3 J 1/2 5
15.9 49.9 K -
16.1 50.5 K 1/2 5 1/2
16.3 51.2 L -
16.5 51.8 L 1/2 6
16.7 52.4 M -
16.9 53 M 1/2 6 1/2
17.1 53.7 N -
17.3 54.3 N 1/2 7
17.5 54.9 O -
17.7 55.6 O 1/2 7 1/2
17.9 56.2 P -
18.1 56.8 P 1/2 8
18.3 57.4 Q -
18.5 58.1 Q 1/2 8 1/2
18.8 59 R -
19 59.6 R 1/2 9
19.2 60.3 S -
19.4 60.9 S 1/2 9 1/2
19.6 61.5 T -
19.8 62.2 T 1/2 10
20 62.8 U -
20.2 63.4 U 1/2 1O 1/2
20.4 64 V -
20.6 64.7 V 1/2 11
20.8 65.3 W -
21 65.9 W 1/2 11 1/2
21.2 66.6 X -
21.4 67.2 X 1/2 12
21.6 67.8 Y -
21.8 68.4 Y 1/2 12 1/2
22 69.1 Z -
22.2 69.7 Z 1/2 13
22.4 70.3 Z+1 -
22.6 71 Z+1 1/2 13 1/2
22.8 71.6 Z+2 -