To find your correct ring size please check the chart below:- Circumference (mm) Diameter (mm) UK, Europe & Australia United States & Canada 44.2 14.1 F 3 44.8 14.3 F ½ 45.5 14.5 G 3 ½ 46.1 14.7 G ½ 46.8 14.9 H 4 47.4 15.1 H ½ 48.0 15.3 I 4 ½ 48.7 15.5 J 49.3 15.7 J ½ 5 50.0 15.9 K 50.6 16.1 K ½ 5 ½ 51.2 16.3 L 51.9 16.5 L ½ 6 52.5 16.7 M 53.1 16.9 M ½ 6 ½ 53.8 17.1 N 54.4 17.3 N ½ 7 55.1 17.5 O 55.7 17.7 O ½ 7 ½ 56.3 17.9 P 57.0 18.1 P ½ 8 57.6 18.3 Q 58.3 18.5 Q ½ 8 ½ 58.9 18.8 R 59.5 19.0 R ½ 9 60.2 19.2 S 60.8 19.4 S ½ 9 ½ 61.4 19.6 T 62.1 19.8 T ½ 10 62.7 20 U 63.4 20.2 U ½ 10 ½ 64.0 20.4 V 64.6 20.6 V ½ 11 65.3 20.8 W 65.9 21.0 W ½ 11 ½ 66.6 21.2 X 67.2 21.4 X ½ 12 67.8 21.6 Y 68.5 21.8 Z 12 ½ 69.1 22.0 Z ½ 69.7 22.2 13 70.4 22.4 Z+1 71.0 22.6 13 ½
