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  1. US & Canada Sizes: This system uses numbers (and sometimes fractions) to denote ring sizes. Sizes typically range from around 3 to 13.5 for adults, with half and quarter sizes available. This is perhaps the most commonly referenced system when talking about “standard sizes” in North America.
  2. UK & Australia Sizes: This system uses letters (with half sizes) to indicate ring sizes, starting from G (or smaller for children) going up to Z+ sizes for larger sizes. It’s another form of standard sizing but is geographically specific.
  3. European Sizes: This system is numerical like the US system but uses a different scale based on the inner circumference of the ring in millimeters. It typically ranges from about 38 to 70.

USA UK EUROPE
4 I 48
4.5 J 49
5 K 50
5.5 L 51.5
6 M 53
6.5 N 54
7 O 55
7.5 P 56.5
8 Q 58
8.5 R 59
9 S 60
9.5 T 61
10 U 62
10.5 V 64
11 W 65
11.5 X 66
12 Y 67
12.5 Z 69
13 Z+1
13.5 Z+2
14 Z+3