Ring Size Guide

How to measure your ring size:

The two simplest ways to gauge your ring size are by either circumference or by diameter.

  • The circumference of a ring measures the length around the circle. To measure : wrap a narrow strip of paper comfortably around your finger, mark the end, and measure the distance.
  • The diameter of a ring measures the distance across the middle inside, which can be used to gauge your ring size from ring you are already wearing.

For either measure, you can read off the appropriate sizing standard for Australia, UK and Ireland, the European Union, French, American, Swiss, Japanese or German. Of course when quoting your ring size please remember to specify which standard you are using. Note also that this system can only be used as a guide. Your local jeweller is best placed to measure your finger or ring sizes.

More about ring sizing standards:

Standard Description Circumference
European The most straightforward, the European system of ring sizing, uses whole sizes equivalent to ring circumference in millimeters. mm=EU
French The European standard in quarter sizes. mm=FR
Swiss Another commonly used variation of the European system: European minus forty. mm=CH+40
Australian, UK & Ireland Starting at C for forty millimeters, the British Standard uses alphabetic letters for each 1.25mm of ring circumference with half sizes in between. mm=(UK*1.25)+36.3
American Still based on old American inch (1.02”), the American ring size represents one tenth of an inch in circumference – further divided into quarter sizes. in=(US*.102)+1.43
    Diameter
Japanese Starting at thirteen millimeters inside diameter the Japanese ring standards progresses in one third of millimeter sizes. mm=(JP+38)/3
German The German standard is equivalent to the metric inside diameter in quarter sizes. mm=DE

Conversion Table:

Circumference   Diametre
mm in au/uk/ie eu us fr ch   mm in jp de
41.00 1.614   41   41 1   13.05 0.513    
41.25 1.624 D     41 ¼ 1 ¼   13.13 0.516    
41.50 1.633     2 41 ½ 1 ½   13.21 0.520    
41.75 1.643       41 ¾ 1 ¾   13.29 0.523   13 ¼
42.00 1.653 D ½ 42   42 2   13.37 0.526 2  
42.25 1.663     2 ¼ 42 ¼ 2 ¼   13.45 0.529    
42.50 1.673 E     42 ½ 2 ½   13.53 0.532   13 ½
42.75 1.683     2 ½ 42 ¾ 2 ¾   13.61 0.535    
43.00 1.692   43   43 3   13.69 0.538 3  
43.25 1.702 E ½     43 ¼ 3 ¼   13.77 0.542   13 ¾
43.50 1.712     2 ¾ 43 ½ 3 ½   13.85 0.545    
43.75 1.722 F     43 ¾ 3 ¾   13.93 0.548    
44.00 1.732   44 3 44 4   14.01 0.551 4 14
44.25 1.742       44 ¼ 4 ¼   14.09 0.554    
44.50 1.751 F ½     44 ½ 4 ½   14.16 0.557    
44.75 1.761     3 ¼ 44 ¾ 4 ¾   14.24 0.560   14 ¼
45.00 1.771 G 45   45 5   14.32 0.563 5  
45.25 1.781       45 ¼ 5 ¼   14.40 0.566    
45.50 1.791     3 ½ 45 ½ 5 ½   14.48 0.570   14 ½
45.75 1.801 G ½     45 ¾ 5 ¾   14.56 0.573    
46.00 1.811   46 3 ¾ 46 6   14.64 0.576 6  
46.25 1.820 H     46 ¼ 6 ¼   14.72 0.579   14 ¾
46.50 1.830       46 ½ 6 ½   14.80 0.582    
46.75 1.840     4 46 ¾ 6 ¾   14.88 0.585    
47.00 1.850 H ½ 47   47 7   14.96 0.588 7 15
47.25 1.860     4 ¼ 47 ¼ 7 ¼   15.04 0.592    
47.50 1.870 I     47 ½ 7 ½   15.12 0.595    
47.75 1.879       47 ¾ 7 ¾   15.20 0.598    
48.00 1.889   48 4 ½ 48 8   15.28 0.601   15 ¼
48.25 1.899 I ½     48 ¼ 8 ¼   15.36 0.604 8  
48.50 1.909       48 ½ 8 ½   15.44 0.607    
48.75 1.919 J   4 ¾ 48 ¾ 8 ¾   15.52 0.611   15 ½
49.00 1.929   49   49 9   15.60 0.614    
49.25 1.938     5 49 ¼ 9 ¼   15.68 0.617 9  
49.50 1.948 J ½     49 ½ 9 ½   15.76 0.620   15 ¾
49.75 1.958       49 ¾ 9 ¾   15.84 0.623    
50.00 1.968 K 50 5 ¼ 50 10   15.92 0.626    
50.25 1.978       50 ¼ 10 ¼   16.00 0.629 10 16
50.50 1.988     5 ½ 50 ½ 10 ½   16.07 0.632    
50.75 1.998 K ½     50 ¾ 10 ¾   16.15 0.635    
51.00 2.007   51   51 11   16.23 0.630   16 ¼
51.25 2.017 L   5 ¾ 51 ¼ 11 ¼   16.31 0.642 11  
51.50 2.027       51 ½ 11 ½   16.39 0.645    
51.75 2.037     6 51 ¾ 11 ¾   16.47 0.648   16 ½
52.00 2.047 L ½ 52   52 12   16.55 0.651    
52.25 2.057       52 ¼ 12 ¼   16.63 0.654 12  
52.50 2.066 M   6 ¼ 52 ½ 12 ½   16.71 0.657   16 ¾
52.75 2.076       52 ¾ 12 ¾   16.79 0.661    
53.00 2.086   53   53 13   16.87 0.664    
53.25 2.096 M ½   6 ½ 53 ¼ 13 ¼   16.95 0.667    
53.50 2.106       53 ½ 13 ½   17.03 0.670 13 17
53.75 2.116 N   6 ¾ 53 ¾ 13 ¾   17.11 0.673    
54.00 2.125   54   54 14   17.19 0.676    
54.25 2.135       54 ¼ 14 ¼   17.27 0.679   17 ¼
54.50 2.145 N ½   7 54 ½ 14 ½   17.35 0.683 14  
54.75 2.155       54 ¾ 14 ¾   17.43 0.686    
55.00 2.165 O 55 7 ¼ 55 15   17.51 0.689   17 ½
55.25 2.175       55 ¼ 15 ¼   17.59 0.692    
55.50 2.185       55 ½ 15 ½   17.67 0.695 15  
55.75 2.194 O ½   7 ½ 55 ¾ 15 ¾   17.75 0.698   17 ¾
56.00 2.204   56   56 16   17.83 0.701    
56.25 2.214 P     56 ¼ 16 ¼   17.90 0.704    
56.50 2.224     7 ¾ 56 ½ 16 ½   17.98 0.707 16 18
56.75 2.234       56 ¾ 16 ¾   18.06 0.711    
57.00 2.244 P ½ 57 8 57 17   18.14 0.714    
57.25 2.253       57 ¼ 17 ¼   18.22 0.717   18 ¼
57.50 2.263 Q     57 ½ 17 ½   18.30 0.720 17  
57.75 2.273     8 ¼ 57 ¾ 17 ¾   18.38 0.723    
58.00 2.283   58   58 18   18.46 0.726   18 ½
58.25 2.293 Q ½   8 ½ 58 ¼ 18 ¼   18.54 0.729    
58.50 2.303       58 ½ 18 ½   18.62 0.733    
58.75 2.312 R     58 ¾ 18 ¾   18.70 0.736 18  
59.00 2.322   59 8 ¾ 59 19   18.78 0.739   18 ¾
59.25 2.332       59 ¼ 19 ¼   18.86 0.742    
59.50 2.342 R ½     59 ½ 19 ½   18.94 0.745    
59.75 2.352     9 59 ¾ 19 ¾   19.02 0.748 19 19
60.00 2.362 S 60   60 20   19.10 0.751    
60.25 2.372     9 ¼ 60 ¼ 20 ¼   19.18 0.755    
60.50 2.381       60 ½ 20 ½   19.26 0.758   19 ¼
60.75 2.391 S ½     60 ¾ 20 ¾   19.34 0.761 20  
61.00 2.401   61 9 ½ 61 21   19.42 0.764    
61.25 2.411 T     61 ¼ 21 ¼   19.50 0.767   19 ½
61.50 2.421     9 ¾ 61 ½ 21 ½   19.58 0.770    
61.75 2.431       61 ¾ 21 ¾   19.66 0.774 21  
62.00 2.440 T ½ 62   62 22   19.74 0.777   19 ¾
62.25 2.450     10 62 ¼ 22 ¼   19.81 0.779    
62.50 2.460 U     62 ½ 22 ½   19.89 0.783    
62.75 2.470       62 ¾ 22 ¾   19.97 0.786 22 20
63.00 2.480   63 10 ¼ 63 23   20.05 0.789    
63.25 2.490 U ½     63 ¼ 23 ¼   20.13 0.792    
63.50 2.500     10 ½ 63 ½ 23 ½   20.21 0.795   20 ¼
63.75 2.509 V     63 ¾ 23 ¾   20.29 0.798    
64.00 2.519   64   64 24   20.37 0.801 23  
64.25 2.529     10 ¾ 64 ¼ 24 ¼   20.45 0.805    
64.50 2.539 V ½     64 ½ 24 ½   20.53 0.808   20 ½
64.75 2.549     11 64 ¾ 24 ¾   20.61 0.811    
65.00 2.559 W 65   65 25   20.69 0.814 24  
65.25 2.568       65 ¼ 25 ¼   20.77 0.817   20 ¾
65.50 2.578     11 ¼ 65 ½ 25 ½   20.85 0.820    
65.75 2.588 W ½     65 ¾ 25 ¾   20.93 0.824    
66.00 2.598   66 11 ½ 66 26   21.01 0.827 25 21
66.25 2.608 X     66 ¼ 26 ¼   21.09 0.830    
66.50 2.618       66 ½ 26 ½   21.17 0.833    
66.75 2.627     11 ¾ 66 ¾ 26 ¾   21.25 0.836   21 ¼
67.00 2.637 X ½ 67   67 27   21.33 0.839 26  
67.25 2.647       67 ¼ 27 ¼   21.41 0.842    
67.50 2.657 Y   12 67 ½ 27 ½   21.49 0.846   21 ½
67.75 2.667       67 ¾ 27¾   21.57 0.849    
68.00 2.677   68 12 ¼ 68 28   21.65 0.852 27  
68.25 2.687 Y ½     68 ¼ 28 ¼   21.72 0.855   21 ¾
68.50 2.696       68 ½ 28 ½   21.80 0.858    
68.75 2.706 Z   12 ½ 68 ¾ 28 ¾   21.88 0.861    
69.00 2.716   69   69 29   21.96 0.864 28 22
69.25 2.726     12 ¾ 69 ¼ 29 ¼   22.04 0.867    
69.50 2.736 Z ½     69 ½ 29 ½   22.12 0.831    
69.75 2.746       69 ¾ 29 ¾   22.20 0.870    
70.00 2.755 Z +1 70 13 70 30   22.28 0.877   22 ¼
70.25 2.765       70 ¼ 30 ¼   22.36 0.880 29  
70.50 2.775       70 ½ 30 ½   22.44 0.883    
70.75 2.785 Z+1 ½   13 ¼ 70 ¾ 30 ¾   22.52 0.886   22 ½
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