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.

FINGER CIRCUMFERENCE INSIDE DIAMETER OF THE RING AU  US 
44.20mm 14.07mm F 3    
44.80mm 14.27mm F 1/2 3 1/4
45.50mm 14.48mm G 3 1/2
46.10mm 14.68mm G 1/2 3.75
46.80mm 14.88mm H 4    
47.40mm 15.09mm H 1/2 4 1/4
48.00mm 15.29mm I 4 1/2
48.70mm 15.49mm J 4.75
49.30mm 15.70mm J 1/2 5    
50mm 15.90mm K 5 1/4
50.60mm 16.10mm K 1/2 5 1/2
51.20mm 16.31mm L 5.75
51.90mm 16.51mm L 1/2 6
52.50mm 16.71mm M 6.25
53.10mm 16.92mm M 1/2 6 1/2
53.80mm 17.12mm N 6 3/4
54.40mm 17.32mm N 1/2 7    
55.10mm 17.52mm O 7.25
55.40mm 17.73mm O 1/2 7 1/2
56.30mm 17.93mm P 7 3/4
57.00mm 18.40mm P 1/2 8    
57.60mm 18.34mm Q 8.25
58.30mm 18.54mm Q 1/2 8 1/2
58.90mm 18.75mm R 8 3/4
59.50mm 18.95mm R 1/2 9    
60.20mm 19.15mm S 9.25
60.80mm 19.35mm S 1/2 9.5
61.40mm 19.56mm T 9.75
62.10mm 19.76mm T 1/2 10    
62.70mm 19.96mm U 10 1/4
63.40mm 20.17mm U 1/2 10 1/2
64.00mm 20.37mm V 10.75
64.60mm 20.57mm V 1/2 11    
65.30mm 20.78mm W 11 1/4
65.90mm 20.98mm W 1/2 11 1/2
66.60mm 21.18mm X 11.75
67.20mm 21.39mm X 1/2 12    
67.80mm 21.59mm Y 12 1/4
68.50mm 22.00mm Z 12 1/2
22.3mm 70.1mm Z +1/2 13
22.4mm 70.4mm Z+1 -
22.7mm 71.3mm Z+2 13.5
22.9mm 71.9mm Z+3 -
23.2mm 72.9mm Z+4 14    
23.5mm 73.8mm Z+5 14 1/2
23.8mm 74.8mm Z+6 15
24.2mm 76mm Z+7 15 1/2