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comparing ring sizes

Antique jewelry:
reference for ring sizes as being used in different countries

There are several systems for denoting the sizes of jewelry rings in use around the world:

  • In the United States and Canada, ring sizes are specified using a numerical scale, with quarter and half sizes. An increase of a full size is an increase of 0.032 inch (0.8128 mm) in diameter, or roughly 1/10 inch (more precisely, 0.1005 in or 2.55 mm) in inside circumference.
  • In Europe (excluding Ireland and the United Kingdom), ring sizes are specified using a numerical scale, with half sizes.
  • In Ireland, the United Kingdom and Australia, ring sizes are specified using an alphabetical scale, with half sizes.
  • In Japan, ring sizes are specified using a numerical scale, that only has whole sizes.
  • In Switzerland, ring sizes are specified using a numerical scale, with quarter and half sizes.
  • In Germany, ring sizes are specified using actual internal diameter in mm. (the same as ISO)
  • Click here for an explanation on how to measure your ring size

The ISO standard for ring sizes is ISO 8653:1986, which defines standard ring sizes in terms of the inner circumference of the ring measured in millimetres.

Great Britain Europe Japan USA diameter mm circumf. mm
      0 11.54 36.25
a       11.90 37.38
    0   12.00 37.70
a½       12.10 38.01
b       12.30 38.64
      1 12.37 38.86
b½       12.50 39.27
      1¼ 12.58 39.52
c       12.70 39.90
  0.15   1½ 12.78 40.15
c½ 0.53     12.90 40.53
  0.84 1 1¾ 13.00 40.84
  1.00     13.05 41.00
d 1.15     13.10 41.15
  1.50   2 13.21 41.50
Great Britain Europe Japan USA diameter mm circumf. mm
d½ 1.78     13.30 41.78
  1.88 2   13.33 41.88
  2.00     13.37 42.00
  2.13   2¼ 13.41 42.13
e 2.41     13.50 42.41
  2.76   2½ 13.61 42.76
  2.91 3   13.66 42.91
e½ 3.00     13.69 43.00
  3.42   2¾ 13.82 43.42
f 3.67     13.90 43.67
  3.98 4   14.00 43.98
  4.00     14.01 44.00
  4.14   3 14.05 44.14
f½ 4.30     14.10 44.30
  4.74   3¼ 14.24 44.74
Great Britain Europe Japan USA diameter mm circumf. mm
g 4.92     14.30 44.92
  5.00     14.32 45.00
  5.02 5   14.33 45.02
  5.40   3½ 14.45 45.40
g½ 5.55     14.50 45.55
  6.00     14.64 46.00
  6.02   3¾ 14.65 46.02
  6.06 6   14.66 46.06
h 6.18     14.70 46.18
  6.68   4 14.86 46.68
h½ 6.81     14.90 46.81
  7.00     14.96 47.00
  7.12 7   15.00 47.12
  7.34   4¼ 15.07 47.34
i 7.44     15.10 47.44
Great Britain Europe Japan USA diameter mm circumf. mm
  7.97   4½ 15.27 47.97
  8.00     15.28 48.00
i½ 8.07     15.30 48.07
  8.16 8   15.33 48.16
  8.63   4¾ 15.48 48.63
j 8.69     15.50 48.69
  9.00     15.60 49.00
  9.20 9   15.66 49.20
j½ 9.32   5 15.70 49.32
k 9.95   5¼ 15.90 49.95
  10.00     15.92 50.00
  10.27 10   16.00 50.27
k½ 10.58   5½ 16.10 50.58
  11.00     16.23 51.00
l 11.24   5¾ 16.31 51.24
Great Britain Europe Japan USA diameter mm circumf. mm
  11.30 11   16.33 51.30
l½ 11.87   6 16.51 51.87
  12.00     16.55 52.00
  12.34 12   16.66 52.34
m 12.46     16.70 52.46
  12.56   6¼ 16.73 52.56
  13.00     16.87 53.00
m½ 13.09     16.90 53.09
  13.16   6½ 16.92 53.16
  13.41 13   17.00 53.41
n 13.72     17.10 53.72
  13.85   6¾ 17.14 53.85
  14.00     17.19 54.00
n½ 14.35     17.30 54.35
  14.44 14   17.33 54.44
Great Britain Europe Japan USA diameter mm circumf. mm
  14.51   7 17.35 54.51
o 14.98     17.50 54.98
  15.00   7¼ 17.56 55.00
  15.48 15   17.66 55.48
o½ 15.61     17.70 55.61
  15.76   7½ 17¾ 55.76
  16.00     17.83 56.00
p 16.23     17.90 56.23
  16.45   7¾ 17.97 56.45
  16.55 16   18.00 56.55
p½ 16.86     18.10 56.86
  17.00     18.14 57.00
  17.15   8 18.19 57.15
q 17.49     18.30 57.49
  17.59 17   18.33 57.59
Great Britain Europe Japan USA diameter mm circumf. mm
  17.77   8¼ 18.39 57.77
  18.00     18.46 58.00
q½ 18.12     18.50 58.12
  18.40   8½ 18.59 58.40
  18.62 18   18.66 58.62
r 18.75     18.70 85.75
  19.00   8¾ 18.78 59.00
r½ 19.38     18.90 59.38
  19.66   9 18.99 59.66
  19.69 19   19.00 59.69
s 20.00     19.10 60.00
  20.38   9¼ 19.22 60.38
s½ 20.63     19.30 60.63
  20.73 20   19.33 60.73
  20.98   9½ 19.41 60.98
Great Britain Europe Japan USA diameter mm circumf. mm
  21.00     19.42 61.00
t 21.26     19.50 61.26
  21.67   9¾ 19.63 61.67
  21.76 21   19.66 61.76
t½ 21.89     19.70 61.89
  22.00     19.74 62.00
  22.33   10 19.84 62.33
u 22.52     19.90 62.52
  22.83 22   20.00 62.83
  23.00   10¼ 20.05 63.00
u½ 23.15     20.10 63.15
  23.59   10½ 20.24 63.59
v 23.77     20.30 63.77
  23.87 23   20.33 63.87
  23.99     20.37 63.99
Great Britain Europe Japan USA diameter mm circumf. mm
  24.28   10¾ 20.46 64.28
v½ 24.40     20.50 64.40
  24.91 24   20.66 64.91
  24.97   11 20.68 64.97
w 25.00     20.69 65.00
  25.60   11¼ 20.88 65.60
w½ 25.66     20.90 65.66
  25.97 25   21.00 65.97
  26.00     21.01 66.00
  26.22   11½ 21.08 66.22
x 26.29     21.10 66.29
x½ 26.92   10¾ 21.30 66.92
  27.01 26   21.33 67.01
y 27.51   12 21.49 67.51
  28.02     21.65 68.02
Great Britain Europe Japan USA diameter mm circumf. mm
  28.05 27   21.66 68.05
y½ 28.20   12¼ 21.71 68.20
z 28.77   12½ 21.89 68.77
  28.99     21.96 68.99
  29.12 28   22.00 69.12
z½ 29.43     22.10 69.43
  29.49   12¾ 22.12 69.49
z+1 29.99     22.28 69.99
  30.15 29 13 22.33 70.15
z+1½ 30.69     22.50 70.69
  30.81   13¼ 22.54 70.81
  31.00     22.60 71.00
  31.19 30   22.66 71.19
z+2 31.31     22.70 71.31
  31.47   13½ 22¾ 71.47
Great Britain Europe Japan USA diameter mm circumf. mm
z+2½ 32.01   13¾ 22.92 72.01
  32.26 31   23.00 72.26
z+3 32.57     23.10 72.57
  32.76   14 23.16 72.76
  33.01     23.24 73.01
z+3½ 33.20     23.30 73.20
  33.32     23.34 73.32
  33.29 32   23.33 73.29
  33.42   14¼ 23.37 73.42
z+4 33.83     23.50 73.83
  33.98   14½ 23.55 73.98
  34.33 33   23.66 74.33
z+4½ 34.46     23.70 74.46
  34.71   14¾ 23.78 74.71
  34.99     23.87 74.99
Great Britain Europe Japan USA diameter mm circumf. mm
z+5 35.08     23.90 75.08
  35.40 34 15 24.00 75.40
z+5½ 35.71     24.10 75.71
  36.00   15¼ 24.19 76.00
z+6 36.34     24.30 76.34
  36.43 35   24.33 76.43
  36.69   15½ 24.41 76.69
z+6½ 37.00     24.51 77.00
  37.31   15¾ 24.61 77.31
  37.47 36   24.66 77.47
z+7 37.60     24.70 77.60
  38.00   16 24.83 78.00
z+7½ 38.23     24.90 78.23
  38.54 37 16¼ 25.00 78.54
See also: the antique jewelry glossary
Antique Jewelry Lecture
About Adin Antwerp
Jewelry Theme Search
Jewelry Glossary

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