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Ring Size Comparison Chart

BRITISH, IRISH, AUSTRALIAN USA, CANADA DIAMETER IN MM DIAMETER IN INS CIRCUMFERENCE (IN MM) JAPAN EUROPE
0000 9.91 .390
00 10.72 .422
0 11.53 .454
A 1/2 11.95 .474 37.6
A 1/2 3/4 12.18 .482
B 1 12.37 .487 38.9 1
B 1/2 1 1/4 12.60
C 1 1/2 12.78 .503 40.2
C 1/2 1 3/4 13.00 .5
D 2 13.21 .520 41.5 2 1.2
D 1/2 2 1/4 13.41 1.8
E 2 1/2 13.61 .536 42.7 3 2.4
E 1/2 2 3/4 13.83 3.00
F 3 14.05 .553 43.4 4 3.7
F 1/2 3 1/8 14.15 4.3
3 1/4 14.25
G 3 3/8 14.36 5 4.9
3 1/2 14.45 .569
G 1/2 3 5/8 14.56 6 5.6
H 3/4 14.65
H 1/2 4 14.86 .585 46.5 7 6
I 4 1/4 15.04
I 1/2 4 1/2 15.27 .601 48 8 8
J 4 5/8 15.40
4 3/4 15.53
J 1/2 5 15.70 .618 49 9 9
K 5 1/8 15.80
4 1/4 15.90
K 1/2 5 3/8 16.00
L 5 1/2 16.10 .634 50.5 10 10
5 3/4 16.30
L 7/8 5 7/8 16.41
M 6 16.51 .650 52 12 12
M 1/2 6 1/4 16.71
N 6 1/2 16.92 .666 53 13 13
N 1/2 6 3/4 17.13
O 7 17.35 .683 54.5 14 14
O 1/2 7 1/4 17.45
P 7 1/2 17.75 .699 55.5 15 15
P 1/2 7 3/4 17.97
Q 8 18.19 .716 57 16 17
Q 1/2 8 1/4 18.35 58 17 18
8 1/2 18.53 .732
R 8 5/8 18.61
8 3/4 18.69
R 1/2 8 7/8 18.80 59.5 18 19
9 18.89 .748
S 9 1/8 19.10
9 1/4 19.22
S 1/2 9 3/8 19.31 61 20 21
9 1/2 19.41 .764
T 9 5/8 19.51
9 3/4 19.62
T 1/2 10 19.84 .781 62 21 22
U 10 1/4 20.02
U 1/2 10 1/2 20.20 .797 63.5 22 23
V 10 5/8 20.32
10 3/4 20.44
V 1/2 11 20.68 .814 64.5 23 24
W 11 1/8 20.76
11 1/4 20.85
W 1/2 1 3/8 20.94 66 25 26
11 1/2 21.08
X 11 5/8 21.18 .830
11 3/4 21.24
X 1/2 11 7/8 21.30
Y 12 21.49 .846 67.5 26 27
Y 1/2 12 1/4 21.69
Z 12 1/2 21.89 .862 68.5 27 28
Z+1 13 22.2 70 28 30
Z+2 13 1/2 22.6 71 29 31
Z+3 14 23 72.5 31 32
Z+4 14 1/2 23.4 74 32 34
Z+5 15 23.9 75 33 35
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