Nina's Jewellery Sizing Guide 
In Australia rings are measured on an alphabetical scale including half sizes. The same scale is used in Ireland and the United Kingdom. 
ring size conversion 
Finger circumference
37.54 38.26 38.86 39.58 40.15 40.84 41.50 42.13 42.76 43.45 44.14 44.45 45.11 45.74 46.02 46.68 47.25 47.97 48.38 49.32 49.64 50.27 50.58 51.55 51.87 52.50 53.16 53.82 54.51 54.82 55.76 56.45 57.15 57.65 58.47 59.06 60.00 60.66 61.29 62.33 62.89 63.46 63.84 64.97 65.22 65.78 66.54 66.92 67.51 68.14 68.77 69.43 70.15 
 
Diameter (inside of ring) 
11.95 12.18 12.37 12.60 12.78 13.00 13.21 13.41 13.61 13.83 14.05 14.15 14.36 14.56 14.65 14.86 15.04 15.27 15.40 15.70 15.80 16.00 16.10 16.41 16.51 16.71 16.92 17.13 17.35 17.45 17.75 17.97 18.19 18.35 18.61 18.80 19.10 19.31 19.51 19.84 20.02 20.20 20.32 20.68 20.76 20.94 21.18 21.30 21.49 21.69 21.89 22.10 22.33 
 
USA ring size
1/2 3/4 1 1 1/4 1 1/2 1 3/4 2 2 1/4 2 2/4 2 3/4 3 3 1/8 3 3/8 3 5/8 3 3/4 4 4 1/4 4 1/2 4 5/8 5 5 1/8 5 3/8 5 1/2 5 7/8 6 6 1/4 6 1/2 6 3/4 7 7 1/4 7 1/2 7 3/4 8 8 1/4 8 5/8 8 7/8 9 1/8 9 3/8 9 5/8 10 10 1/4 10 1/2 10 5/8 11 11 1/8 11 3/8 11 5/8 11 7/8 12 12 1/4 12 1/2 12 3/4 13 
 
British ring size
A A 1/2 B B 1/2 C C 1/2 D D 1/2 E E 1/2 F F 1/2 G G 1/2 H H 1/2 I I 1/2 J J 1/2 K K 1/2 L L 1/2 M M 1/2 N N 1/2 O O 1/2 P P 1/2 Q Q 1/2 R R 1/2 S S 1/2 T T 1/2 U U 1/2 V V 1/2 W W 1/2 X X 1/2 Y Y 1/2 Z Z 1/2 Z+1 
 
 
 
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