Ring Sizes

British Standard
1283:1945
European
Size
American Size
(Approx.)
Inside Diameter
Inchesmm
A0.475012.065
380.476212.096
0.482812.263
10.486012.344
390.488712.414
B0.490512.459
0.498312.657
400.501312.733
0.502012.751
C0.506012.852
410.513813.051
20.518013.157
D0.521513.246
420.526313.369
0.529313.444
0.534013.564
E0.537013.640
430.538913.687
0.544813.838
30.550013.970
440.551414.006
F0.552514.034
0.560314.232
450.563914.324
0.566014.376
G0.568014.427
0.575814.625
460.576514.642
40.582014.783
H0.583514.821
470.589014.961
0.591315.019
0.598015.189
I0.599015.215
480.601515.279
0.606815.413
4950.614115.597
J0.614515.608
0.622315.806
500.626615.916
K0.630016.002
0.637816.200
510.639116.234
L60.645516.396
520.651716.552
0.653316.594
M0.661016.789
0.662016.815
530.664216.871
0.668816.988
N0.676517.183
540.676717.189
70.678017.221
0.684317.381
550.689317.507
O0.692017.577
0.694017.628
0.699817.775
560.701817.826
P0.707517.971
80.710018.034
570.714318.144
0.715318.169
Q0.723018.364
0.726518.453
580.726918.462
0.730818.562
R0.738518.758
590.739418.780
90.743018.872
0.746318.956
600.751919.098
S0.754019.152
0.759019.279
0.761819.350
610.764419.416
T0.769519.545
620.777019.736
0.777219.741
100.778019.761
U0.785019.939
630.789520.054
0.792820.137
10½0.794020.168
V0.800520.333
640.802020.372
0.808320.531
110.811020.599
650.814620.690
W0.816020.726
0.823820.925
6611½0.827121.008
X0.831521.120
0.839321.318
670.839621.326
120.843021.412
Y0.847021.514
680.852221.645
0.854821.712
12½0.859021.819
Z0.862521.908
690.864721.963
0.870322.106
130.875022.225

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