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Ring Size Chart

Inside Diameter
Inches MM USA UK HK
0.554 14.07 3 F 6
0.562 14.27 3.25 F½ 6.5
0.57 14.48 3.50 G 7.25
0.578 14.68 3.75 G½ 8
0.586 14.88 4 H 8.5
0.594 15.09 4.25 H½ 9
0.602 15.29 4.50 I 9.5
0.61 15.49 4.75 I½ 10
0.618 15.7 5 J 11
0.626 15.9 5.25 J½ 11.5
0.634 16.1 5.50 K 12
0.642 16.31 5.75 K½ 12.5
0.65 16.51 6 L 13
0.658 16.71 6.25 L½ 14
0.666 16.92 6.50 M 14.5
0.674 17.12 6.75 M½ 15
0.682 17.32 7 N 15.5
0.69 17.53 7.25 N½ 16
0.698 17.73 7.50 O 17
0.706 17.93 7.75 O½ 17.5
0.714 18.14 8 P 18
0.722 18.34 8.25 P½ 18.5
0.73 18.54 8.50 Q 19
0.738 18.75 8.75 Q½ 20
0.746 18.95 9 R 20.5
0.754 19.15 9.25 R½ 21
0.762 19.35 9.50 S 21.5
0.77 19.56 9.75 S½ 22
0.778 19.76 10 T 22.5