Women's Rings Size Conversion

O - Circumference   *   Ø - Diameter 

Ø  US

UK
Europe

mm mm Ring Size
44.2 14.1 3 F
44.8 14.3   F 1/2
45.5 14.5 3 1/2 G
46.1 14.7   G 1/2
46.8 14.9 4 H
47.4 15.1   H 1/2
48.0 15.3 4 1/2 I
48.7 15.5   J
49.3 15.7 5 J 1/2
50.0 15.9   K
50.6 16.1 5 1/2 K 1/2
51.2 16.3   L
51.9 16.5 6 L 1/2
52.5 16.7   M
53.1 16.9 6 1/2 M 1/2
53.8 17.1   N
54.4 17.3 7 N 1/2
55.1 17.5   O
55.7 17.7 7 1/2 O 1/2
56.3 17.9   P
57.0 18.1 8 P 1/2
57.6 18.3   Q
58.3 18.5 8 1/2 Q 1/2
58.9 18.8   R
59.5 19.0 9 R 1/2
60.2 19.2   S
60.8 19.4 9 1/2 S 1/2
61.4 19.6   T
62.1 19.8 10 T 1/2
63.4 20.2 10 1/2 U 1/2
64.0 20.4   V
64.6 20.6 11 V 1/2
65.3 20.8   W
65.9 21.0 11 1/2 W 1/2
66.6 21.2   X
67.2 21.4 12 X 1/2
67.8 21.6   Y
68.5 21.8 21 1/2 Z
69.1 22.0   Z 1/2
69.7 22.2 13  
70.4 22.4   Z + 1
71.0 22.6 13 1/2  

Women's Rings Size Conversion

O - Circumference   *   Ø - Diameter 

Ø  US

UK
Europe

mm mm Ring Size
44.2 14.1 3 F
44.8 14.3   F 1/2
45.5 14.5 3 1/2 G
46.1 14.7   G 1/2
46.8 14.9 4 H
47.4 15.1   H 1/2
48.0 15.3 4 1/2 I
48.7 15.5   J
49.3 15.7 5 J 1/2
50.0 15.9   K
50.6 16.1 5 1/2 K 1/2
51.2 16.3   L
51.9 16.5 6 L 1/2
52.5 16.7   M
53.1 16.9 6 1/2 M 1/2
53.8 17.1   N
54.4 17.3 7 N 1/2
55.1 17.5   O
55.7 17.7 7 1/2 O 1/2
56.3 17.9   P
57.0 18.1 8 P 1/2
57.6 18.3   Q
58.3 18.5 8 1/2 Q 1/2
58.9 18.8   R
59.5 19.0 9 R 1/2
60.2 19.2   S
60.8 19.4 9 1/2 S 1/2
61.4 19.6   T
62.1 19.8 10 T 1/2
63.4 20.2 10 1/2 U 1/2
64.0 20.4   V
64.6 20.6 11 V 1/2
65.3 20.8   W
65.9 21.0 11 1/2 W 1/2
66.6 21.2   X
67.2 21.4 12 X 1/2
67.8 21.6   Y
68.5 21.8 21 1/2 Z
69.1 22.0   Z 1/2
69.7 22.2 13  
70.4 22.4   Z + 1
71.0 22.6 13 1/2  

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