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Conversion for International Ring Sizes

Use this chart to convert your local standard to the US ring sizes for ordering, you can also calculate the size from millimeters as well.

US  Size
Dia. -inch
Dia. in MM
Metric -MM
British 
French 
German 
Japanese
Swiss
5
.618
15.70
49.0
J 1/2
-
15 3/4
9
   
6
.650
16.51
51.5
M
52 3/4
16 1/2
12
12 3/4
 
6 1/2
.666
16.92
52.8
N
54
17
13
14
 
7
.683
17.35
54.0
O
55 1/4
17 1/4
14
15 1/4
 
7 1/2
.699
17.75
55.3
P
56 1/2
17 3/4
15
16 1/2
 
8
.716
18.19
56.6
Q
57 3/4
18
16
17 3/4
 
8 1/2
.732
18.53
57.8
-
-
18 1/2
17
   
9
.748
18.89
59.1
-
-
19
18
   
9 1/2
.764
19.41
60.3
-
-
19 1/2
19
   
10
.781
19.84
61.6
T 1/2
-
20
20
   
10 1/2
.797
20.20
62.8
U 1/2
-
20 1/4
22
   
11
.814
20.68
64.1
V 1/2
-
20 3/4
23
   
11 1/2
-
21.08
65.3
-
-
21
24
   
12
.846
21.49
66.6
Y
67 1/2
21 1/4
25
27 1/2
 
12 1/2
.862
21.89
67.9
Z
68 3/4
21 3/4
26
28 3/4
 
13
.879
22.33
69.1
-
-
22
27
   

 

Determining Your Ring Size

If you don't know your ring size follow these instructions and you will be able to determine it.
 
1. Cut a strip of paper no wider than 1/4" .

2. Wrap the paper snugly around your finger and mark the paper where it meets.

3. Measure the marked length of paper and compare it to the chart below.

Note: If your knuckle is significantly larger than the base of your finger, you should measure the knuckle as described above and pick a size somewhere in between.

This should give you a good idea of your ring size.

Ring Size Paper Length
(Inches)
4 1 13/16
5 1 15/16
6 2 1/16
7 2 2/16
8 2 4/16
9 2 5/15
10 2 7/16
11 2 9/16
12 2 10/16
13 2 12/16
14 2 14/16

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