Find Your Ring Size

This comprehensive ring size conversion chart provides a global comparison of ring sizes across different countries, along with corresponding measurements in millimeters for inside diameter and circumference:

US/CA UK/AU/IE/NZ JP/IN/CN/SA ES/IT/NL/CH Inside Diameter (mm) Circumference (mm)
3 F 4 4.25 14.05 44.14
3.25 F.5 - 4.75 14.24 44.74
3.5 G 5 5.5 14.45 45.40
3.75 G.5 6 6 14.65 46.02
4 H 7 6.75 14.88 46.80
4.25 H.5 - 7.5 15.09 47.40
4.5 I 8 8 15.29 48.00
4.75 J - 8.75 15.49 48.70
5 J 1/2 9 9.25 15.70 49.30
5.25 K - 10 15.90 50.00
5.5 K 1/2 10 10.5 16.10 50.60
5.75 L - 11.25 16.31 51.20
6 L 1/2 11 11.75 16.51 51.90
6.25 M 12 12.5 16.71 52.50
6.5 M 1/2 13 13.25 16.92 53.10
6.75 N - 13.75 17.12 53.80
7 N 1/2 14 14.5 17.32 54.40
7.25 O - 15 17.53 55.10
7.5 O 1/2 15 15.75 17.73 55.70
7.75 P - 16.25 17.93 56.30
8 P 1/2 16 17 18.14 57.00
8.25 Q - 17.5 18.34 57.60
8.5 Q 1/2 17 18.25 18.54 58.30
8.75 R - 19 18.75 58.90
9 R 1/2 18 19.5 18.95 59.50
9.25 S - 20.25 19.15 60.20
9.5 S 1/2 19 20.75 19.35 60.80
9.75 T - 21.5 19.56 61.40
10 T 1/2 20 22 19.76 62.10
10.25 U 21 22.75 19.96 62.70
10.5 U 1/2 22 23.25 20.17 63.40
10.75 V - 24 20.37 64.00
11 V 1/2 23 24.75 20.57 64.60
11.25 W - 25.25 20.78 65.30
11.5 W 1/2 24 26 20.98 65.90
11.75 X - 26.5 21.18 66.60
12 X 1/2 25 27.25 21.39 67.20
12.25 Y - 27.75 21.59 67.80
12.5 Z 26 28.5 21.79 68.50
12.75 Z 1/2 - 29 22.00 69.10
13 - 27 29.75 22.20 69.70
13.25 Z1 - 30.5 22.40 70.40
13.5 - - 31 22.61 71.00
13.75 Z2 - 31.75 22.81 71.70
14 Z3 - 32.25 23.01 72.30
14.25 - - 33 23.22 72.90
14.5 Z4 - 33.5 23.42 73.60
14.75 - - 34.25 23.62 74.20
15 - - 34.75 24.23 76.10

This chart helps customers easily find their corresponding ring size across different international sizing systems by matching their local size to the equivalent size in other countries.