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International Ring Size Conversion Chart

>
US Size
Diameter in Inches
Diameter in MM
Metric -MM
British
French
German
Japanese
Swiss
0000
.390
9.91
  
-
        
00
.422
10.72
  
-
        
0
.454
11.53
  
-
        
1/2
.474
11.95
  
A
        
3/4
.482
12.18
  
A 1/2
        
1
.487
12.37
38.9
B
    
1
  
1 1/4
-
12.60
39.6
B 1/2
        
1 1/2
.503
12.78
40.2
C
        
1 3/4
-
13.00
40.8
C 1/2
        
2
.520
13.21
41.5
D
41 1/2
13 1/2
2
1 1/2
2 1/4
-
13.41
42.1
D 1/2
-
-
    
2 1/2
.536
13.61
42.7
E
42 3/4
13 3/4
3
2 3/4
2 3/4
-
13.83
43.4
E 1/2
-
-
    
3
.553
14.05
44.0
F
44
14
4
4
3 1/8
-
14.15
44.3
F 1/2
-
-
    
3 1/4
-
14.25
44.6
-
-
-
    
3 3/8
-
14.36
44.9
G
45 1/4
-
5
5 1/4
3 1/2
.569
14.45
45.2
-
-
14 1/2
    
3 5/8
-
14.56
45.6
 G 1/2
-
  
6
  
3 3/4
-
14.65
45.9
H
46 1/2
    
6 1/2
4
.585
14.86
46.5
H 1/2
-
15
7
  
4 1/4
-
15.04
47.1
I 
47 3/4
    
7 3/4
4 1/2
.601
15.27
47.8
I 1/2
-
15 1/4
8
  
4 5/8
-
15.40
48.1
J
49
15 1/2
  
9
4 3/4
-
15.53
48.4
-
-
      
5
.618
15.70
49.0
J 1/2
-
15 3/4
9
  
5 1/8
-
15.80
49.3
K
50
    
10
5 1/4
-
15.90
49.6
-
-
      
5 3/8
-
16.0
50.0
K 1/2
-
  
10
  
5 1/2
.634
16.10
50.3
L
51 3/4
16
  
11 3/4
5 3/4
-
16.30
50.9
-
-
      
5 7/8
-
16.41
51.3
L 1/2
-
      
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
  
Education and Guidance
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Brilliant service

I recently contacted MDC diamonds to enquire about having a engagement ring made, after looking through the website I had an online chat with Rosa who was very helpful, followed by several phone calls with moishy who called me in the uk from the new York office, moishy advised on the best setting to go with my choice of diamond, and after the conversation I was happy to place the order. I was kept updated on the progress of my order throughout the process, and received the ring very well packed through insured FeDex within 14 days of my original order which I thought was very good considering the ring had to be made specially!, The ring was lovely and my now fiancé loved it, I asked her on our trip to new York and we managed to pop in and meet Moishy which was great! Thanks for your help and great service Moishy, if we have any more diamond requirements MDC will be our first calling point
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Brilliant service
I recently contacted MDC diamonds to enquire about having a engagement ring made, after looking thro...
 
Trevor K.
Ferndown, Dorset, UK
December 08, 2011

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