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. A ring that fits well will be just smaller than the second knuckle of the finger. This way the fit is comfortable but it will not slide off the finger.
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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