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Ring Sizing Guide

Inner Diameter (mm) Inner Circumference (mm) US Sizes Australian Sizes
17.3 54.4 7 N 1/2
17.5 55.0 7 1/4 O
17.7 55.7 7 1/2 O 1/2
17.9 56.3 7 3/4 P
18.1 56.9 8 P 1/2
18.3 57.6 8 1/4 Q
18.5 58.2 8 1/2 Q 1/2
18.7 58.9 8 3/4 R
18.9 59.5 9 R 1/2
19.2 60.1 9 1/4 S
19.4 60.8 9 1/2 S 1/2
19.6 61.4 9 3/4 T
19.8 62.1 10 T 1/2
20.0 62.7 10 1/4 U
20.2 63.3 10 1/2 U 1/2
20.4 64.0 10 3/4 V
20.6 64.6 11 V 1/2
20.8 65.2 11 1/4 W
21.0 65.9 11 1/2 W 1/2
21.2 66.5 11 3/4 X
21.4 67.2 12 X 1/2
21.6 67.8 12 1/4 Y
21.8 68.4 12 1/2 Z
22.0 69.1 12 3/4 Z 1/2
22.2 69.7 13
22.4 70.3 13 1/4 Z1
22.6 71.0 13 1/2
22.8 71.6 13 3/4 Z2
23.0 72.3 14 Z3

Alpha Rings sell in the US size. It is far easier and more accurate to use this ring sizing system – plus, as most of our rings come from the USA, it makes sense. Conversion from the British (Australian) sizing system is not an exact science but if you use the ring size guide chart above, you’ll get pretty close.

If you have absolutely no idea about your size, we recommend going into a jeweller to try and get an approximate size.

Get in touch if you need further assistance and we’ll help you get your size right. An article to assist with ring sizing can also be found here.