This ring size chart is based on our closest conversions. When in doubt, size 1/4 size up for a slightly looser fit and vice versa.
US/Canada |
Inside Diameter (mm) |
Inside Circumference (mm) |
3 |
14.05mm |
44.14mm |
3 1/4 |
14.25mm |
44.77mm |
3 1/2 |
14.45mm |
45.40mm |
3 3/4 |
14.65mm |
46.02mm |
4 |
14.86mm |
46.68mm |
4 1/4 |
15.04mm |
47.25mm |
4 1/2 |
15.27mm |
47.97mm |
4 3/4 |
15.53mm |
48.79mm |
5 |
15.70mm |
49.32mm |
5 1/4 |
15.90mm |
49.95mm |
5 1/2 |
16.10mm |
50.58mm |
5 3/4 |
16.30mm |
51.21mm |
6 |
16.51mm |
51.87mm |
6 1/4 |
16.71mm |
52.50mm |
6 1/2 |
16.92mm |
53.16mm |
6 3/4 |
17.13mm |
53.82mm |
7 |
17.35mm |
54.51mm |
7 1/4 |
17.45mm |
54.82mm |
7 1/2 |
17.75mm |
55.76mm |
7 3/4 |
17.97mm |
56.45mm |
8 |
18.19mm |
57.15mm |
8 1/4 |
18.35mm |
57.65mm |
8 1/2 |
18.53mm |
58.21mm |
8 3/4 |
18.69mm |
58.72mm |
9 |
18.89mm |
59.34mm |
9 1/4 |
19.22mm |
60.38mm |
9 1/2 |
19.41mm |
60.98mm |
9 3/4 |
19.62mm |
61.64mm |
10 |
19.84mm |
62.33mm |
10 1/4 |
20.02mm |
62.89mm |
10 1/2 |
20.20mm |
63.46mm |
10 3/4 |
20.44mm |
64.21mm |
11 |
20.68mm |
64.97mm |
11 1/4 |
20.85mm |
65.50mm |
11 1/2 |
21.08mm |
66.22mm |
11 3/4 |
21.24mm |
66.73mm |
12 |
21.49mm |
67.51mm |
12 1/4 |
21.69mm |
68.14mm |
12 1/2 |
21.89mm |
68.77mm |
12 3/4 |
22.10mm |
69.43mm |
13 |
22.33mm |
70.15mm |
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Choosing the right size can be tricky, there are some instances where you may have to size up or down. Learn more in our Size Guide Page.