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Ring Size Conversion Guide
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
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.
Oval
Round
Pear
Emerald
Cushion
Marquise
Radiant
Trillion
Princess
