Ring Size Guide

Different countries use different scales to measure ring size. We make sense of these differing standards in the international ring size chart below.

International Ring Size Chart

Inside Diameter Millimeters (mm) Inside Circumference  Millimeters (mm) U.S. and Canada U.K., Europe and Australia Switzerland Asia (Hong Kong, China, Singapore, Taiwan, Japan)
14.1 44.3 3 F 4 4
14.3 44.9 3.25 F.5 5.25 5
14.5 45.6 3.5 G
14.7 46.2 3.75 G.5 6.5 6
14.9 46.8 4 H 7
15.1 47.4 4.25 H.5 7.75
15.3 48.1 4.5 I 8
15.5 48.7 4.75 1.5 9
15.7 49.3 5 J 9
15.9 50.0 5.25 J.5 10
16.1 50.6 5.5 K 10
16.3 51.2 5.75 K.5 11.75
16.5 51.8 6 L 12.75 11
16.7 52.5 6.25 L.5 12
16.9 53.1 6.5 M 14 13
17.1 53.7 6.75 M.5
17.3 54.3 7 N 15.25 14
17.5 55.0 7.25 N.5
17.7 55.6 7.5 O 16.5 15
17.9 56.2 7.75 O.5
18.1 56.9 8 P 17.75 16
18.3 57.5 8.25 P.5
18.5 58.1 8.5 Q 17
18.8 59.1 8.75 Q.5 19
19 59.7 9 R 18
19.2 60.3 9.25 R.5 20.25
19.4 60.9 9.5 S 19
19.6 61.6 9.75 S.5 21.5
19.8 62.2 10 T 20
20 62.8 10.25 T.5 21
20.2 63.5 10.5 U 22.75 22
20.4 64.1 10.75 U.5
20.6 64.7 11 V 23
20.8 65.3 11.25 V.5 25
21 66.0 11.5 W 24
21.2 66.6 11.75 W.5
21.4 67.2 12 X 27.5 25
21.6 67.9 12.25 X.5
21.8 68.5 12.5 Y 28.75 26
22 69.1 12.75 Z
22.2 69.7 13 Z.5 27
22.4 70.4 13.25
22.6 71.0 13.5 Z1

Now that you’re armed with these tips on how to determine ring size, you’ll be ready to surprise your bride-to-be with a ring that fits perfectly on her finger.