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Ring Sizes
Note

Inside Circumference
Number Sizes
inches
mm
US / Canada
(Standard)
UK / Irish / Australia
(Esquivalent)
Japanese
(Esquivalent)
Swiss
(Esquivalent)
1.438
36.5
0
 
 
 
1.463
37.2
1/4
 
 
 
1.488
37.8
1/2
A 
 
 
1.513
38.4
3/4
A 1/2 
 
 
1.539
39.1
1
B 
1 
 
1.564
39.7
1 1/4
B 1/2 
 
 
1.589
40.4
1 1/2
C 
 
 
1.614
41.0
1 3/4
C 1/2 
 
 
1.639
41.6
2
D 
2 
1.50 
1.664
42.3
2 1/4
D 1/2 
 
 
1.689
42.9
2 1/2
E 
3 
2.75 
1.714
43.5
2 3/4
E 1/2 
 
 
1.740
44.2
3
F 
4 
4.00 
1.765
44.8
3 1/4
F 1/2 
5 
5.25 
1.790
45.5
3
1/2 
G 
 
1.815
46.1
3 3/4
G 1/2 
6 
6.50 
1.840
46.7
4
H 
7 
 
1.865
47.4
4 1/4
H 1/2 
7.75 
 
1.890
48.0
4 1/2
I 
8 
 
1.915
48.7
4 3/4
J 
 
9.00 
1.941
49.3
5
J 1/2 
9 
 
1.966
49.9
5 1/4
K 
 
10.00 
1.991
50.6
5 1/2
K 1/2 
10 
 
2.016
51.2
5 3/4
L 
 
11.75 
2.041
51.8
6
L 1/2 
11 
12.75 
2.066
52.5
6 1/4
M 
12 
 
2.091
53.1
6 1/2
M 1/2 
13 
14.00 
2.116
53.8
6 3/4
N 
 
 
2.141
54.4
7
N 1/2 
14 
15.25 
2.167
55.0
7 1/4
O  
 
 
2.192
55.7
7 1/2
O 1/2 
15 
16.50 
2.217
56.3
7 3/4
P  
 
 
2.242
56.9
8
P 1/2 
16 
17.75 
2.267
57.6
8 1/4
Q  
 
 
2.292
58.2
8 1/2
Q 1/2 
17 
 
2.317
58.9
8 3/4
R 
 
19 
2.342
59.5
9
R 1/2 
18 
 
2.368
60.1
9 1/4
S 
 
20.25 
2.393
60.8
9 1/2
S 1/2 
19 
 
2.418
61.4
9 3/4
T 
 
21.5 
2.443
62.1
10
T 1/2 
20 
 
2.468
62.7
10 1/4
U 
21 
 
2.493
63.3
10 1/2
U 1/2 
22 
22.75 
2.518
64.0
10 3/4
V 
 
 
2.543
64.6
11
V 1/2 
23 
 
2.569
65.2
11 1/4
W 
 
25 
2.594
65.9
11 1/2
W 1/2 
24 
 
2.619
66.5
11 3/4
X 
 
 
2.644
67.2
12
X 1/2 
25 
27.50 
2.669
67.8
12 1/4
Y  
 
 
2.694
68.4
12 1/2
Z 
26 
28.75 
2.719
69.1
12 3/4
Z 1/2 
 
 
2.744
69.7
13
 
27 
 
2.769
70.3
13 1/4
Z1 
 
 
2.795
71.0
13 1/2
 
 
 
2.820
71.6
13 3/4
Z2 
 
 
2.845
72.3
14
Z3 
 
 
2.870
72.9
14 1/4
 
 
 
2.895
73.5
14 1/2
Z4 
 
 
2.920
74.2
14 3/4
 
 
 
2.945
74.8
15
 
 
 
2.970
75.4
15 1/4
 
 
 
2.996
76.1
15 1/2
 
 
 
3.021
76.7
15 3/4
 
 
 
3.046
77.4
16
 
 
 
2.644
67.2
12
X 1/2 
 
 
2.669
67.8
12 1/4
Y  
 
 
2.694
68.4
12 1/2
Z 
 
 
2.719
69.1
12 3/4
Z 1/2 
 
 
2.744
69.7
13
 
 
 
2.769
70.3
13 1/4
Z1 
 
 
2.795
71.0
13 1/2
 
 
 
2.820
71.6
13 3/4
Z2 
 
 
2.845
72.3
14
Z3 
 
 
2.870
72.9
14 1/4
 
 
 
2.895
73.5
14 1/2
Z4 
 
 
2.920
74.2
14 3/4
 
 
 
2.945
74.8
15
 
 
 
2.970
75.4
15 1/4
 
 
 
2.996
76.1
15 1/2
 
 
 
3.021
76.7
15 3/4
 
 
 
3.046
77.4
16
 
 
 
3.071
78.0
16 1/4
 
 
 
3.096
78.6
16 1/2
 
 
 
3.121
79.3
16 3/4
 
 
 
3.146
79.9
17
 
 
 
3.171
80.6
17 1/4
 
 
 
3.197
81.2
17 1/2
 
 
 
3.222
81.8
17 3/4
 
 
 
3.247
82.5
18
 
 
 
3.272
83.1
18 1/4
 
 
 
3.297
83.7
18 1/2
 
 
 
3.322
84.4
18 3/4
 
 
 
3.347
85.0
19
 
 
 
3.372
85.7
19 1/4
 
 
 
3.397
86.3
19 1/2
 
 
 
3.423
86.9
19 3/4
 
 
 
3.448
87.6
20
 
 
 
3.473
88.2
20 1/4
 
 
 
3.498
88.8
20 1/2
 
 
 
3.523
89.5
20 3/4
 
 
 
3.548
90.1
21
 
 
 
3.573
90.8
21 1/4
 
 
 
3.598
91.4
21 1/2
 
 
 
3.624
92.0
21 3/4
 
 
 
3.649
92.7
22
 
 
 
3.674
93.3
22 1/4
 
 
 
3.699
94.0
22 1/2
 
 
 
3.724
94.6
3/4
 
 
 
3.749
95.2
23
 
 
 
3.774
95.9
23 1/4
 
 
 
3.799
96.5
23 1/2
 
 
 
3.825
97.1
23 3/4
 
 
 
3.850
97.8
24
 
 
 
3.875
98.4
24 1/4
 
 
 
3.900
99.1
24 1/2
 
 
 
3.925
99.7
24 3/4
 
 
 
3.950
100.3
25
 
 
 
3.975
101.0
25 1/4
 
 
 
4.000
101.6
25 1/2
 
 
 
4.025
102.2
25 3/4
 
 
 
4.051
102.9
26
 
 
 
4.076
103.5
26 1/4
 
 
 
  • The ring conversion chart shows the relative sizes and lengths in inches and millimeters.
  • The chart should be read from left to right to find your appropriate ring size.
  • Our rings are made at a US 7 (UK N1/2), we need to resize or remake rings ordered at other sizes.


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