Determining your ring size can be tricky without the proper tools. Use our Ring Size Conversion chart below to find your ring size in different countries.
The easiest way to determine a ring size is to measure a well-fitting ring that they already have. Take a ruler or tape measure and measure the inside diameter of the ring. So measure from left to right the inside of the ring and do not measure the edge. The number of millimeters is the ring size.The most accurate way to determine the ring size is to visit a local jeweler and have them measure the ring finger.
Ring Diameter (MM)
USA/Canada
United Kingdom
France
Germany
Japan
Switzerland
14.0 mm.
3
F
44
14
4
14.4 mm.
3½
G
45¼
14½
5½
6⅓
14.8 mm.
H½
46½
15
7
6½
15.2 mm.
4½
I½
47¾
15¼
8
15.6 mm.
5
J½
49
15¾
9
9½
16.0 mm.
L
50¾
16
10½
10¾
16.5 mm.
6
M
51½
16½
12
12¾
16.9 mm.
N
52¾
17
13
17.3 mm.
O
54
17¼
17.7 mm.
7½
P
55¼
17¾
18.2 mm.
Q
56¾
18
18.6 mm.
8½
Q½
58
18½
19.0 mm.
R½
59¼
19
20
19.4 mm.
S½
60¾
19½
21
19.8 mm.
10
T½
61¾
21¾
20.2 mm.
U½
62¾
20¼
22
22¾
20.6 mm.
11
V½
64¼
20¾
23
24
21.0 mm.
11½
W½
66
25¾
21.4 mm.
Y
67¼
21¼
25
27½
21.8 mm.
12½
Z
68
26
28¾
22.2 mm.
-
69
27
29¼
22.6 mm.
13½
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