Ring Sizes

British Standard
1283:1945		 European
Size		 American Size
(Approx.)		 Inside Diameter
Inchesmm
A0.475012.065
380.476212.096
A½0.482812.263
10.486012.344
390.488712.414
B0.490512.459
B½0.498312.657
400.501312.733
1½0.502012.751
C0.506012.852
C½410.513813.051
20.518013.157
D0.521513.246
420.526313.369
D½0.529313.444
2½0.534013.564
E0.537013.640
430.538913.687
E½0.544813.838
30.550013.970
440.551414.006
F0.552514.034
F½0.560314.232
450.563914.324
3½0.566014.376
G0.568014.427
G½0.575814.625
460.576514.642
40.582014.783
H0.583514.821
470.589014.961
H½0.591315.019
4½0.598015.189
I0.599015.215
480.601515.279
I½0.606815.413
4950.614115.597
J0.614515.608
J½0.622315.806
500.626615.916
K5½0.630016.002
K½0.637816.200
510.639116.234
L60.645516.396
520.651716.552
L½0.653316.594
M0.661016.789
6½0.662016.815
530.664216.871
M½0.668816.988
N0.676517.183
540.676717.189
70.678017.221
N½0.684317.381
550.689317.507
O0.692017.577
7½0.694017.628
O½0.699817.775
560.701817.826
P0.707517.971
80.710018.034
570.714318.144
P½0.715318.169
Q0.723018.364
8½0.726518.453
580.726918.462
Q½0.730818.562
R0.738518.758
590.739418.780
90.743018.872
R½0.746318.956
600.751919.098
S0.754019.152
9½0.759019.279
S½0.761819.350
610.764419.416
T0.769519.545
620.777019.736
T½0.777219.741
100.778019.761
U0.785019.939
630.789520.054
U½0.792820.137
10½0.794020.168
V0.800520.333
640.802020.372
V½0.808320.531
110.811020.599
650.814620.690
W0.816020.726
W½0.823820.925
6611½0.827121.008
X0.831521.120
X½0.839321.318
670.839621.326
120.843021.412
Y0.847021.514
680.852221.645
Y½0.854821.712
12½0.859021.819
Z0.862521.908
690.864721.963
Z½0.870322.106
130.875022.225
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