This ring size chart offers our closest size conversions. When in doubt, we recommend sizing up by 1/4 size for a more comfortable fit—or down for a snugger feel.
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.