Masonic Rings - International Ring Size Conversion
Ring Sizing
There is only one way to get sized for a ring. Go to a jeweler and ask. Do not use strings, tape, printouts, insto-sizers, downloaded charts or anything other than a jeweler. Some rings can be resized, some cannot. Either way, you will want to be 100% about your ring size. If you guess and guess wrong, it's going to cost money and time.
International Ring Size Conversion Table
US Size
Dia. -inch
Dia. in MM
Metric -MM
British
French
German
Japanese
Swiss
6
.650
16.51
51.5
M
52 3/4
16 1/2
12
12 3/4
6 1/4
-
16.71
52.2
M 1/2
-
6 1/2
.666
16.92
52.8
N
54
17
13
14
6 3/4
-
17.13
53.4
N 1/2
-
7
.683
17.35
54.0
O
55 1/4
17 1/4
14
15 1/4
7 1/4
-
17.45
54.7
O 1/2
-
7 1/2
.699
17.75
55.3
P
56 1/2
17 3/4
15
16 1/2
7 3/4
-
17.97
55.9
P 1/2
-
8
.716
18.19
56.6
Q
57 3/4
18
16
17 3/4
8 1/4
-
18.35
57.2
Q 1/2
-
8 1/2
.732
18.53
57.8
-
-
18 1/2
17
8 5/8
-
18.61
58.4
R
59
19
8 3/4
-
18.69
58.4
-
-
8 7/8
-
18.80
59.0
R 1/2
-
9
.748
18.89
59.1
-
-
19
18
9 1/8
-
19.10
59.4
S
60 1/4
20 1/4
9 1/4
-
19.22
59.7
-
-
9 3/8
-
19.31
60.0
S 1/2
-
9 1/2
.764
19.41
60.3
-
-
19 1/2
19
9 5/8
-
19.51
60.6
T
61 1/2
21 1/2
9 3/4
-
19.62
60.9
-
-
10
.781
19.84
61.6
T 1/2
-
20
20
10 1/4
-
20.02
62.2
U
62 3/4
21
22 3/4
10 1/2
.797
20.20
62.8
U 1/2
-
20 1/4
22
10 5/8
-
20.32
63.1
V
63
23 3/4
10 3/4
-
20.44
63.5
-
-
11
.814
20.68
64.1
V 1/2
-
20 3/4
23
11 1/8
-
20.76
64.3
W
65
25
11 1/4
-
20.85
64.7
-
-
11 3/8
-
20.94
65.0
W 1/2
-
11 1/2
-
21.08
65.3
-
-
21
24
11 5/8
.830
21.18
65.7
X
66 1/4
26 1/4
11 3/4
-
21.24
66.0
-
-
11 7/8
-
21.30
66.3
X 1/2
-
12
.846
21.49
66.6
Y
67 1/2
21 1/4
25
27 1/2
12 1/4
-
21.69
67.2
Y 1/2
-
12 1/2
.862
21.89
67.9
Z
68 3/4
21 3/4
26
28 3/4
12 3/4
-
22.10
68.5
Z 1/2
-
13
.879
22.33
69.1
-
-
22
27
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