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Find Out Ring Size Equivalents Globally

  • US
  • CA
  • UK
  • AU
  • IE
  • NZ
  • JP
  • IN
  • CN
  • SA
  • ES
  • IT
  • NL
  • CH
  • Inside-Diameter
  • Cercumferene (mm)
3 F 4 4.25 14.05 & 44.14
3.25 F.5 - 4.75 14.24 & 44.74
3.50 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