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How to determine your ring size

Ring Size Comparison Chart          
U.S. &
Canadian
Standard
Inside Diameter
mm / inches
Inside
Circumference
mm / inches
British
French
Equivalent
German
Japanese
1 1/2
12.78 / .503
40.2 / 1.580
C
40 1/2
12 3/4
-
2
13.21 / .520
41.5 / 1.634
D
41 1/2
13 1/4
2
2 1/2
13.61 / .536
42.7 / 1.684
E
42 3/4
13 3/4
3
3
14.05 / .553
44.0 / 1.739
F
44
14
4
3 1/2
14.45 / .569
45.2 / 1.788
G
45 1/4
14 1/2
-
4
14.86 / .585
46.5 / 1.836
H 1/2
46 1/2
15
7
4 1/2
15.27 / .601
47.8 / 1.888
I 1/2
47 3/4
15 1/4
8
5
15.70 / .618
49.0 / 1.941
J 1/2
49
15 3/4
9
5 1/2
16.10 / .634
50.2 / 1.992
L
50 1/4
16
-
6
16.51 / .650
51.5 / 2.042
M
51 1/2
16 1/2
12
6 1/2
16.92 / .666
52.8 / 2.092
N
52 3/4
17
13
7
17.35 / .683
54.0 / 2.146
N 1/2
54
17 1/4
14
7 1/2
17.63 / .699
55.3 / 2.196
O 1/2
55 1/2
17 1/2
15
8
18.19 / .716
56.6 / 2.249
P 1/2
56 3/4
18
16
8 1/2
18.59 / .732
57.8 / 2.300
Q 1/2
58
18 1/2
17
9
18.99 / .748
59.1 / 2.350
R 1/2
59 1/4
19
18
9 1/2
19.41 / .764
60.3 / 2.400
S 1/2
60 1/2
19 1/2
19
10
19.84 / .781
61.6 / 2.463
T 1/2
61 3/4
20
20
10 1/2
20.24 / .797
62.8 / 2.504
U 1/2
62 3/4
20 1/4
22
11
20.68 / .814
64.1 / 2.567
V 1/2
64 1/2
20 3/4
23
11 1/2
21.01 / .830
66.0 / 2.608
W 1/2
66
21
24
12
21.41 / .846
67.3 / 2.658
Y
67 1/4
21 1/2
25
                                                       
How to determine your ring size: All you have to do is simply measure the circumference or distance around your finger. You can use a strip of paper or string.  Use a ruler with milimeter measurements. You can also  measure the diameter  or distance across in milimeters of a ring you are currently wearing. When in doubt between two sizes, it is always a safer bet to go to the next larger ring size. This ensures your new ring will fit you properly.
 
An example : The inside of this ring is approximately 18mm in diameter, making it a size 8.