Switzerland:
N/A
D: N/A
C: N/A
UK:
N/A
D: N/A
C: N/A
Europe:
N/A
D: N/A
C: N/A
US:
N/A
D: N/A
C: N/A
Japan:
N/A
D: N/A
C: N/A
Brazil:
N/A
D: N/A
C: N/A

D = diameter, C = circumference

The Swiss ring size system is used by Switzerland, Spain and Italy and is very closely related to the European ring sizes but uses a different numbering system but doesn't always align, which is why we created our easy-to-use tool to help you easily convert your Swiss ring size to a European, US or UK ring size.

To use the ring size conversion tool, simply:

Swiss Ring Size Conversion Chart

If you prefer to use a table, then we have also included a full Swiss ring size conversion chart that shows:

Switzerland USA/Canada UK/Australia Europe Germany Japan Brazil Diameter
(mm/in)		 Circumference
(mm/in)
4 E 1/2 44 3 4 7 14.0 mm / 0.55 in 44.0 mm / 1.73 in
4.5 F 1/2 45 3.5 5 8 14.3 mm / 0.56 in 45.0 mm / 1.77 in
5 G 46 3.75 6 9 14.6 mm / 0.57 in 46.0 mm / 1.81 in
5.5 H 47 4 7 10 15.0 mm / 0.59 in 47.0 mm / 1.85 in
6 I 48 4.5 8 11 15.3 mm / 0.60 in 48.0 mm / 1.89 in
6.5 J 49 4.75 9 12 15.6 mm / 0.61 in 49.0 mm / 1.93 in
7 K 50 5.25 10 13 15.9 mm / 0.63 in 50.0 mm / 1.97 in
7.5 K 1/2 51 5.5 11 14 16.2 mm / 0.64 in 51.0 mm / 2.01 in
8 M 52 6.25 12 15 16.6 mm / 0.65 in 52.0 mm / 2.05 in
8.5 M 1/2 53 6.5 13 16 16.9 mm / 0.67 in 53.0 mm / 2.09 in
9 N 54 6.75 17 17.2 mm / 0.68 in 54.0 mm / 2.13 in
9.5 O 55 7.25 14 18 17.5 mm / 0.69 in 55.0 mm / 2.17 in
10 P 56 7.75 15 19 17.8 mm / 0.70 in 56.0 mm / 2.20 in
10.5 P 1/2 57 8 16 20 18.1 mm / 0.71 in 57.0 mm / 2.24 in
11 Q 1/2 58 8.5 17 21 18.5 mm / 0.73 in 58.0 mm / 2.28 in
11.5 R 59 8.75 18 22 18.8 mm / 0.74 in 59.0 mm / 2.32 in
12 S 60 9.25 19 23 19.1 mm / 0.75 in 60.0 mm / 2.36 in
12.5 S 1/2 61 9.5 20 24 19.4 mm / 0.76 in 61.0 mm / 2.40 in
13 T 62 9.75 21 25 19.7 mm / 0.78 in 62.0 mm / 2.44 in
13.5 U 1/2 63 10.5 22 26 20.1 mm / 0.79 in 63.0 mm / 2.48 in
14 V 64 10.75 23 27 20.4 mm / 0.80 in 64.0 mm / 2.52 in
14.5 V 1/2 65 11 24 28 20.7 mm / 0.81 in 65.0 mm / 2.56 in
15 W 1/2 66 11.25 25 29 21.0 mm / 0.83 in 66.0 mm / 2.60 in
15.5 X 1/2 67 11.75 26 30 21.3 mm / 0.84 in 67.0 mm / 2.64 in
16 Y 68 12.25 27 31 21.6 mm / 0.85 in 68.0 mm / 2.68 in
16.5 Z 1/2 69 12.5 28 32 22.0 mm / 0.87 in 69.0 mm / 2.72 in
17 70 13 29 33 22.3 mm / 0.88 in 70.0 mm / 2.76 in