Ring Size Conversion Chart


Whether you are shopping online or find that perfect ring while vacationing overseas converting your normal ring size to the local size can be quite tricky. Fortunately we have an easy to use, easy to understand ring size conversion chart. The chart calculates from your local size to U.S./Canadian and vice versa.

Inside Ring Diameter Inside Ring Circumference International Standard Sizes
MM Inches MM Inches Britain & Australia USA & Canada Europe
14.88 0.586 46.74 1.840 H 1/2 4 47
15.28 0.602 48.02 1.891 I 1/2 4.5
15.69 0.618 50.58 1.941 J 1/2 5
16.10 0.634 50.87 1.992 L 5.5
16.51 0.650 51.15 2.042 M 6 52
16.92 0.666 53.15 2.093 N 6.5
17.33 0.682 54.43 2.143 O 7
17.73 0.698 55.71 2.194 P 7.5 56
18.14 0.714 57.00 2.244 Q 8 57
18.55 0.730 58.28 2.295 Q 3/4 8.5
18.96 0.746 59.56 2.345 R 3/4 9 60
19.37 0.763 60.85 2.396 S 3/4 9.5
19.78 0.779 62.13 2.446 T 1/2 10 62
20.18 0.795 63.41 2.497 U 1/2 10.5
20.59 0.811 64.69 2.547 V 1/2 11 65
21.00 0.827 65.98 2.598 W 3/4 11.5
21.41 0.843 67.26 2.648 Y 12
21.82 0.859 68.54 2.699 Z 12.5
22.23 0.875 69.82 2.749 Z+1 13 70
22.63 0.891 71.11 2.800 Z+1.5 13.5
23.04 0.907 72.39 2.850 Z+3 14
23.45 0.923 73.67 2.901 Z+4
14.5
23.86 0.939 74.96 2.951 Z+5 15
24.27 0.955 76.24 3.002 Z+6
15.5
24.68 0.971 77.52 3.052 Z+7
16
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