Ring Size Chart

Use this Japan column chart to convert your local standard ring sizes for ordering.

Diameter -inch
Diameter in MM
Metric -Circumference
Japanese 
.390
9.91
   
.422
10.72
   
.454
11.53
   
.474
11.95
   
.482
12.18
   
.487
12.37
38.9
1
-
12.60
39.6
 
.503
12.78
40.2
 
-
13.00
40.8
 
.520
13.21
41.5
2
-
13.41
42.1
 
.536
13.61
42.7
3
-
13.83
43.4
 
.553
14.05
44.0
4
-
14.15
44.3
 
-
14.25
44.6
 
-
14.36
44.9
5
.569
14.45
45.2
 
-
14.56
45.6
6
-
14.65
45.9
 
.585
14.86
46.5
7
-
15.04
47.1
 
.601
15.27
47.8
8
-
15.40
48.1
 
-
15.53
48.4
 
.618
15.70
49.0
9
-
15.80
49.3
 
-
15.90
49.6
 
-
16.0
50.0
10
.634
16.10
50.3
 
-
16.30
50.9
 
-
16.41
51.3
 
.650
16.51
51.5
12
-
16.71
52.2
 
.666
16.92
52.8
13
-
17.13
53.4
 
.683
17.35
54.0
14
-
17.45
54.7
 
.699
17.75
55.3
15
-
17.97
55.9
 
.716
18.19
56.6
16
-
18.35
57.2
 
.732
18.53
57.8
17
-
18.61
58.4
 
-
18.69
58.4
 
-
18.80
59.0
 
.748
18.89
59.1
18
-
19.10
59.4
 
-
19.22
59.7
 
-
19.31
60.0
 
.764
19.41
60.3
19
-
19.51
60.6
 
-
19.62
60.9
 
.781
19.84
61.6
20
-
20.02
62.2
21
.797
20.20
62.8
22
-
20.32
63.1
 
-
20.44
63.5
 
.814
20.68
64.1
23
-
20.76
64.3
 
-
20.85
64.7
 
-
20.94
65.0
 
-
21.08
65.3
24
.830
21.18
65.7
 
-
21.24
66.0
 
-
21.30
66.3
 
.846
21.49
66.6
25
-
21.69
67.2
 
.862
21.89
67.9
26
-
22.10
68.5
 
.879
22.33
69.1
27