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International Ring Size Cross-reference Chart |
| At Grown Brilliance, our ring sizes are presented in standard US sizes, as defined by the Gemological Institute of America (GIA). Use this chart to convert US sizes to common international sizes and to corresponding finger circumference and ring diameter measurements. |
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| Our Sizes |
Inside Diameter |
Inside Circumference |
Cross-Refernce Sizes |
| US & Canada |
Inches |
MM |
Inches |
MM |
UK/Australia |
Europe |
Japan |
Netherlands |
| 3 |
0.555 |
14.1 |
1.74 |
44.3 |
F |
44 |
4 |
4 |
| 3 1/4 |
0.563 |
14.3 |
1.77 |
44.9 |
F.5 |
45 |
5 |
5.25 |
| 3 1/2 |
0.571 |
14.5 |
1.80 |
45.6 |
G |
- |
- |
- |
| 3 3/4 |
0.579 |
14.7 |
1.82 |
46.2 |
G.5 |
46 |
6 |
6 1/2 |
| 4 |
0.587 |
14.9 |
1.84 |
46.8 |
H |
47 |
7 |
- |
| 4 1/4 |
0.594 |
15.1 |
1.87 |
47.4 |
H.5 |
- |
- |
7 3/4 |
| 4 1/2 |
0.602 |
15.3 |
1.89 |
48.1 |
I |
48 |
8 |
- |
| 4 3/4 |
0.610 |
15.5 |
1.92 |
48.7 |
I.5 |
- |
- |
9 |
| 5 |
0.618 |
15.7 |
1.94 |
49.3 |
J |
49 |
9 |
- |
| 5 1/4 |
0.626 |
15.9 |
1.97 |
50 |
J.5 |
50 |
- |
10 |
| 5 1/2 |
0.634 |
16.1 |
1.99 |
50.6 |
K |
- |
10 |
- |
| 5 3/4 |
0.642 |
16.3 |
2.02 |
51.2 |
K.5 |
51 |
- |
11 3/4 |
| 6 |
0.650 |
16.5 |
2.04 |
51.8 |
L |
52 |
11 |
12 3/4 |
| 6 1/4 |
0.657 |
16.7 |
2.07 |
52.5 |
L.5 |
- |
12 |
- |
| 6 1/2 |
0.665 |
16.9 |
2.09 |
53.1 |
M |
53 |
13 |
14 |
| 6 3/4 |
0.673 |
17.1 |
2.11 |
53.7 |
M.5 |
- |
- |
- |
| 7 |
0.681 |
17.3 |
2.14 |
54.3 |
N |
54 |
14 |
15 1/4 |
| 7 1/4 |
0.689 |
17.5 |
2.17 |
55 |
N.5 |
55 |
- |
- |
| 7 1/2 |
0.697 |
17.7 |
2.19 |
55.6 |
O |
- |
15 |
16 1/2 |
| 7 3/4 |
0.705 |
17.9 |
2.21 |
56.2 |
O.5 |
56 |
- |
- |
| 8 |
0.713 |
18.1 |
2.24 |
56.9 |
P |
57 |
16 |
17 3/4 |
| 8 1/4 |
0.720 |
18.3 |
2.26 |
57.5 |
P.5 |
- |
- |
- |
| 8 1/2 |
0.728 |
18.5 |
2.29 |
58.1 |
Q |
58 |
17 |
- |
| 8 3/4 |
0.740 |
18.8 |
2.33 |
59.1 |
Q.5 |
19 |
- |
19 |
| 9 |
0.748 |
19 |
2.35 |
59.7 |
R |
- |
18 |
- |
| 9 1/4 |
0.756 |
19.2 |
2.37 |
60.3 |
R.5 |
60 |
- |
20 1/4 |
| 9 1/2 |
0.764 |
19.4 |
2.40 |
60.9 |
S |
61 |
19 |
- |
| 9 3/4 |
0.772 |
19.6 |
2.43 |
61.6 |
S.5 |
- |
- |
21 1/2 |
| 10 |
0.780 |
19.8 |
2.45 |
62.2 |
T |
62 |
20 |
- |
| 10 1/4 |
0.787 |
20 |
2.47 |
62.8 |
T.5 |
- |
21 |
- |
| 10 1/2 |
0.795 |
20.2 |
2.50 |
63.5 |
U |
63 |
22 |
22 3/4 |
| 10 3/4 |
0.803 |
20.4 |
2.52 |
64.1 |
U.5 |
64 |
- |
- |
| 11 |
0.811 |
20.6 |
2.55 |
64.7 |
V |
- |
23 |
- |
| 11 1/4 |
0.819 |
20.8 |
2.57 |
65.3 |
V.5 |
65 |
- |
25 |
| 11 1/2 |
0.827 |
21 |
2.60 |
66 |
W |
66 |
24 |
- |
| 11 3/4 |
0.835 |
21.2 |
2.62 |
66.6 |
W.5 |
- |
- |
- |
| 12 |
0.843 |
21.4 |
2.65 |
67.2 |
X |
67 |
25 |
27 1/2 |
| 12 1/4 |
0.850 |
21.6 |
2.67 |
67.9 |
X.5 |
- |
- |
- |
| 12 1/2 |
0.858 |
21.8 |
2.70 |
68.5 |
Y |
68 |
26 |
28 3/4 |
| 12 3/4 |
0.866 |
22 |
2.72 |
69.1 |
Z |
69 |
- |
- |
| 13 |
0.879 |
22.2 |
2.74 |
69.7 |
Z.5 |
70 |
27 |
- |
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