Ring size

Ring Sizes Comparison Chart:
Default U.S. British Millimeters Japanese
3 F 43 3
3.5 G 45 5
4 H 47 7
4.5 I 48 8
5 J 49 9
5.5 K 50 10
6 L 52 12
6.5 M 53 13
7 N 54 14
7.5 O 55 15
8 P 57 17
8.5 Q 58 18
9 R 60 20
9.5 S 61 21
10 T 62 22
10.5 U 63 23
11 V 65 25
11.5 W 66 26
12 X 67 27
12.5 Y 68 28
13 Z 70 30
13.5 Z1 71 31
14 Z3 73 33

We use the chart above for the conversion of US and Canadian number sizes to the “Wheatsheaf” system of letter sizes used in the UK, Ireland and Australia,  etc…

Diameters and circumferences are given in millimetres.  Please note that these measurements are exact for the US system and approximate for other sizing scales since the intervals do not correspond exactly.

Ring sizing gauges and finger gauges as well as published  charts do not always agree.  The ring sizing information presented here is consistent with the instruments and measuring technique that we use in our factory.

Please note that if you desire any assistance regarding how to calculate your ring size or indeed if you require a size smaller or greater than offered on the above chart – just drop an email to info@ofir-jewelry.com – we will be happy to assist you!