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Ring Size Conversion Chart
Conversion Chart For Ring Size
US, UK, Japan, and Italy Sizes
US Size |
Inside Diameter (in) |
Inside Diameter (mm) |
Inside Circumference (in) |
Inside Circumference (mm) |
UK Size |
Japan Size |
Italy Size |
3 |
0.554 |
14.07 |
1.74 |
44.2 |
F |
4 |
4.25 |
3.25 |
0.562 |
14.27 |
1.77 |
44.8 |
F 1/2 |
5 |
4.75 |
3.5 |
0.57 |
14.48 |
1.79 |
45.5 |
G |
6 |
5.5 |
3.75 |
0.578 |
14.68 |
1.82 |
46.1 |
G 1/2 |
7 |
6 |
4 |
0.586 |
14.88 |
1.84 |
46.8 |
H |
7 |
6.75 |
4.25 |
0.594 |
15.09 |
1.87 |
47.4 |
H 1/2 |
8 |
7.5 |
4.5 |
0.602 |
15.29 |
1.89 |
48.0 |
I |
8 |
8 |
4.75 |
0.61 |
15.49 |
1.92 |
48.7 |
I 1/2 |
9 |
8.75 |
5 |
0.618 |
15.7 |
1.94 |
49.3 |
J |
9 |
9.25 |
5.25 |
0.626 |
15.9 |
1.97 |
50.0 |
J 1/2 |
10 |
10 |
5.5 |
0.634 |
16.1 |
1.99 |
50.6 |
K |
10 |
10.5 |
5.75 |
0.642 |
16.31 |
2.02 |
51.2 |
K 1/2 |
11 |
11.25 |
6 |
0.65 |
16.51 |
2.04 |
51.9 |
L |
11 |
11.75 |
6.25 |
0.658 |
16.71 |
2.07 |
52.5 |
L 1/2 |
12 |
12.5 |
6.5 |
0.666 |
16.92 |
2.09 |
53.1 |
M |
13 |
13 |
6.75 |
0.674 |
17.12 |
2.12 |
53.8 |
M 1/2 |
13 |
13.75 |
7 |
0.682 |
17.32 |
2.14 |
54.4 |
N |
14 |
14.5 |
7.25 |
0.69 |
17.53 |
2.17 |
55.1 |
N 1/2 |
15 |
15 |
7.5 |
0.698 |
17.73 |
2.19 |
55.7 |
O |
15 |
15.75 |
7.75 |
0.706 |
17.93 |
2.22 |
56.3 |
P |
16 |
16.25 |
8 |
0.714 |
18.14 |
2.24 |
57.0 |
P 1/2 |
16 |
17 |
8.25 |
0.722 |
18.34 |
2.27 |
57.6 |
Q |
17 |
17.5 |
8.5 |
0.73 |
18.54 |
2.29 |
58.3 |
Q 1/2 |
17 |
18.25 |
8.75 |
0.738 |
18.75 |
2.32 |
58.9 |
R |
18 |
19 |
9 |
0.746 |
18.95 |
2.34 |
59.5 |
R 1/2 |
18 |
19.5 |
9.25 |
0.754 |
19.15 |
2.37 |
60.2 |
S |
19 |
20.25 |
9.5 |
0.762 |
19.35 |
2.39 |
60.8 |
S 1/2 |
19 |
21 |
9.75 |
0.77 |
19.56 |
2.42 |
61.4 |
T |
20 |
21.5 |
10 |
0.778 |
19.76 |
2.44 |
62.1 |
T 1/2 |
20 |
22.25 |
10.25 |
0.786 |
19.96 |
2.47 |
62.7 |
U |
21 |
23 |
10.5 |
0.794 |
20.17 |
2.49 |
63.4 |
U 1/2 |
22 |
23.5 |
10.75 |
0.802 |
20.37 |
2.52 |
64.0 |
V |
22 |
24.25 |
11 |
0.81 |
20.57 |
2.54 |
64.6 |
V 1/2 |
23 |
25 |
11.25 |
0.818 |
20.78 |
2.57 |
65.3 |
W |
24 |
25.5 |
11.5 |
0.826 |
20.98 |
2.59 |
65.9 |
W 1/2 |
24 |
26.25 |
11.75 |
0.834 |
21.18 |
2.62 |
66.6 |
X |
25 |
27 |
12 |
0.842 |
21.39 |
2.64 |
67.2 |
X 1/2 |
25 |
27.75 |
12.25 |
0.85 |
21.59 |
2.67 |
67.8 |
Y |
26 |
28.5 |
12.5 |
0.858 |
21.79 |
2.69 |
68.5 |
Z |
27 |
29 |
12.75 |
0.866 |
22.00 |
2.72 |
69.1 |
Z 1/2 |
27 |
29.75 |
13 |
0.874 |
22.20 |
2.75 |
69.7 |
Z+1 |
28 |
30.5 |
13.25 |
0.882 |
22.40 |
2.77 |
70.4 |
Z+1 |
28 |
31.25 |
13.5 |
0.89 |
22.61 |
2.80 |
71.0 |
Z+1 |
29 |
32 |
13.75 |
0.898 |
22.81 |
2.82 |
71.7 |
Z+1 |
29 |
32.75 |
14 |
0.906 |
23.01 |
2.85 |
72.3 |
Z+2 |
30 |
33.5 |
14.25 |
0.914 |
23.22 |
2.87 |
72.9 |
Z+2 |
30 |
34.25 |
14.5 |
0.922 |
23.42 |
2.90 |
73.6 |
Z+2 |
31 |
35 |
14.75 |
0.93 |
23.62 |
2.92 |
74.2 |
Z+2 |
31 |
35.75 |
15 |
0.938 |
23.83 |
2.95 |
74.8 |
Z+3 |
32 |
36.5 |
15.25 |
0.946 |
24.03 |
2.97 |
75.5 |
Z+3 |
33 |
37.25 |
15.5 |
0.954 |
24.23 |
3.00 |
76.1 |
Z+3 |
33 |
38 |
15.75 |
0.962 |
24.44 |
3.02 |
76.7 |
Z+3 |
34 |
38.75 |
16 |
0.97 |
24.64 |
3.05 |
77.4 |
Z+4 |
34 |
39.5 |