Ring Size Conversion Chart

 
  INSIDE
CIRCUMFERENCE (mm)
     IN.        MM.  
US, CANADA 
& MEXICO
UK, AUSTRALIA
& IRELAND 
FRANCE
GERMANY, RUSSIA,
UKRAINE, & ASIA
1.74 in  42.9 mm
3.0
F
44
14
 1.77 in 44.8 mm
3.25
F 1/2
44.625
14.25
1.79 in  45.5 mm
3.5
G
45.25
14.5
1.82 in  46.1 mm
3.75
G 1/2
45.875
14.75
 1.84 in 46.8 mm
4.0
H
46.5
15
1.87 in  47.4 mm
4.25
h 1/2
47.125
15.25
1.89 in  48.0 mm
4.5
I
47.75
15.5
1.92 in  48.7 mm
4.75
J
48.375
---
1.94 in  49.3 mm
5.0
J 1/2
49
15.75
 1.97 in 50.0 mm
5.25
K
49.625
16
1.99 in  50.6 mm
5.5
K 1/2
50.25
16.25
 2.02 in 51.2 mm
5.75
L
50.875
---
2.04 in  51.9 mm
6.0
L 1/2
51.5
16.5
 2.07 in 52.5 mm
6.25
M
52.125
16.75
 2.09 in 53.1 mm
6.5
M 1/2
52.75
17
 2.12 in 53.8 mm
6.75
N
53.375
---
 2.14 in 54.4 mm
7.0
N 1/2
54
17.25
 2.17 in  55.1 mm
7.25
O
54.625
17.5
 2.19 in  55.7 mm
7.5
O 1/2
55.25
17.75
2.22 in   56.3 mm
7.75
P
55.875
---
2.24 in  57.0 mm
8.0
P 1/2
56.5
18
2.277 in 57.6 mm
8.25
Q
57.125
18.25
 2.29 in 58.3 mm
8.5
Q 1/2
57.75
18.5
 2.32 in 58.9 mm
8.75
R
58.375
18.75
 2.34 in 59.5 mm
9.0
R 1/2
59
19
 2.37 in 60.2 mm
9.25
S
59.625
19.25
 2.39 in  60.8 mm
9.5
S 1/2
60.25
19.5
 2.42 in 61.4 mm
9.75  T 60.875 19.75
 2.44 in 62.1 mm
10.0 T 1/2 61.5 20
 2.47 in 62.7
10.25 T 1/2 61.5 20
 2.47 in 62.7 mm
10.25  U 62.125 20.25
 2.49 in 63.4 mm
10.5 U 1/2 62.75 20.5
 2.52 in 64.0 mm
10.75 V 63.375 ---
 2.54 in 64.6 mm
11.0 V 1/2 64 20.75
 2.57 in 65.3 mm
11.25 W 64.625 ---
 2.59 in 65.9 mm
11.5 W 1/2 65.25 21
 2.62 in 66.6 mm
11.75  X 65.875 ---
 2.65 in 67.2 mm
12.0 X 1/2 66.5 21.25
 2.68 in  68.1 mm
12.25  Y 67.125 21.5
 2.71 in 68.5 mm
12.5 Z 67.75 21.75
 2.72 in 69.1 mm
12.75 Z 1/2 68.375 ---
 2.75 in 69.7 mm
13 --- 69 22