RING SIZER TOOL

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Ring Size Guide

Circumference (mm) Diameter (mm) United States and Canada UK, Europe, and Australia Asia Switzerland
44.2 14.1 3 F 4 4
44.6 14.3 F ½ 5 5 ¼
45.5 14.5 3 ½ G
46.1 14.7 G ½ 6 6 ½
46.8 14.9 4 H 7
47.4 15.1 H ½ 7 ¾
48.0 15.3 4 ½ I  8
48.7 15.5 J 9
49.3 15.7 5 J ½ 9
50.0 15.9 K 10
50.6 16.1 5 ½ K ½ 10 
51.2 16.3 L 11 ¾
51.9 16.5 6 L ½ 12 ¾
52.5 16.7 M 12
53.1 16.9 6 ½ M ½ 13 14
53.8 17.1 N
54.4 17.3 7 N ½ 14  15 ¼
55.1 17.5 O
55.7 17.7 7 ½ O ½ 15 16 ½
56.3 17.9 P
57.0 18.1 8 P ½ 16 17 ¾
57.6 18.3 Q
58.3 18.5 8 ½ Q ½ 17
58.9 18.8 R 19
59.5 19.0 9 R ½ 18
60.2 19.2 S
60.8 19.4 9 ½ S ½ 19
61.4 19.6 T
62.1 19.8 10 T ½ 20
62.7 20.0 U  21
63.4 20.2 10 ½ U ½ 22 22 ¾
64.0 20.3 V
64.6 20.6 11 V ½ 23
65.3 20.8 W 25
65.9 21.0 11 ½ W ½ 24
66.6 21.2 X
67.2 21.4 12 X ½ 25  27 ½
67.8 21.6 Y
68.5 21.8 12 ½ Z 26 28 ¾
69.1 22.0 Z ½
69.7 22.2 13 27
70.4 22.4 Z + 1
71.0 22.6 13 ½
 Circumference (mm)
44.2 44.8 45.5
46.1 46.8 47.4
48.0 48.7 49.3
50.0 50.6 51.2
51.9 52.5 53.1
53.8 54.4 55.1
55.7 56.3 57.0
57.6 58.3 58.9
59.5 60.2 60.8
61.4 62.1 62.7
63.4 64.0 64.6
65.3 65.9 66.6
67.2 67.8 68.5
69.1 69.7 70.4
71.0

Diameter (mm)

 14.1 14.3 14.5
14.7 14.9 15.1
15.3 15.5 15.7
15.9 16.1 16.3
16.5 16.7 16.9
17.1 17.3 17.5
17.7 17.9 18.1
18.3 18.5 18.8
19.0 19.2 19.4
19.6 19.8 20.0
20.2 20.4 20.6
20.8 21.0 21.2
21.4 21.6 21.8
22.0 22.2 22.4
22.6

United States And Canada

 3.0 N/A 3 ½
4.0 4 ½
5.0 5 ½
6.0 6 ½
7.0 7 ½
8.0 8 ½
9.0 9 ½
10.0 10 ½
11 11 ½
12 12 ½
13 13 ½

UK, Europe And Australia 

 F F ½ G
G ½ H H ½
I J J ½
K K ½ L
L ½ M M ½
N N ½ O
O ½ P  P ½
Q Q ½ R
R ½ S S ½
T T ½ U
U ½ V V ½
W W ½ X
X ½ Y Z
Z ½ Z+1

Asia 

 4 5
6 7
8 9
10
11 12 13
14
15 16
17
18 19
20 21
22 23
24
25 26
27

Switzerland

 4 5¼  
6½ 7¾
9
10 11¾
12¾ 14
15¼
16½ 17¾
19
20¼
20½ 21½
22¾
25
27½
28¾