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Ring size converter

UK Size European
Size (Approx.)
American Size
(Approx.)
Inside  Diameter
Inches mm
G     0.5680 14.427
G1/2     0.5758 14.625
  46   0.5765 14.642
    4 0.5820 14.783
H   0.5835 14.821
  47   0.5890 14.961
H1/2     0.5913 15.019
    41/2 0.5980 15.189
I     0.5990 15.215
  48   0.6015 15.279
I1/2     0.6068 15.413
  49 5 0.6141 15.597
J     0.6145 15.608
J1/2     0.6223 15.806
  50 0.6266 15.916
K   51/2 0.6300 16.002
K1/2     0.6378 16.200
  51   0.6391 16.234
L   6 0.6455 16.396
  52   0.6517 16.552
L1/2     0.6533 16.594
M     0.6610 16.789
    61/2 0.6620 16.815
  53   0.6642 16.871
M1/2     0.6688 16.988
N     0.6765 17.183
  54   0.6767 17.189
    7 0.6780 17.221
N1/2     0.6843 17.381
  55   0.6893 17.507
O     0.6920 17.577
    71/2 0.6940 17.628
O1/2     0.6998 17.775
  56   0.7018 17.826
P     0.7075 17.971
    8 0.7100 18.034
  57   0.7143 18.144
P1/2     0.7153 18.169
Q     0.7230 18.364
    81/2 0.7265 18.453
  58   0.7269 18.462
Q1/2     0.7308 18.562
R     0.7385 18.758
  59   0.7394 18.780
    9 0.7430 18.872
R1/2     0.7463 18.956
  60   0.7519 19.098
S     0.7540 19.152
    91/2 0.7590 19.279
S1/2     0.7618 19.350
  61   0.7644 19.416
T     0.7695 19.545
  62   0.7770 19.736
T1/2     0.7772 19.741
    10 0.7780 19.761
U     0.7850 19.939
  63   0.7895 20.054
U1/2     0.7928 20.137
    101/2 0.7940 20.168
V     0.8005 20.333
  64   0.8020 20.372
V1/2     0.8083 20.531
    11 0.8110 20.599
  65   0.8146 20.690
W     0.8160 20.726
W1/2     0.8238 20.925
  66 111/2 0.8271 21.008
X     0.8315 21.120
X1/2     0.8393 21.318
  67   0.8396 21.326
    12 0.8430 21.412
Y     0.8470 21.514
  68   0.8522 21.645
Y1/2     0.8548 21.712
    121/2 0.8590 21.819
Z     0.8625 21.908
  69   0.8647 21.963
Z1/2     0.8703 22.106
    13 0.8750 22.225