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

If you are in any of the countries that uses the UK's unique ring sizing standard, which includes the UK (obviously!), Ireland, Australia, New Zealand and South Africa, it can be challenging to find out what the equivalnet size is in US or European ring sizes, which is why we created a simple, easy-to-use tool to help you find out.

To use the ring size conversion tool, simply:

UK Ring Size Conversion Chart

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

UK USA/Canada Europe Switzerland Japan Brazil Diameter
(mm/in)		 Circumference
(mm/in)
A 0.5 12.0 mm / 0.47 in 37.8 mm / 1.49 in
A 1/2 1 12.2 mm / 0.48 in 38.5 mm / 1.52 in
B 12.5 mm / 0.49 in 39.1 mm / 1.54 in
B 1/2 1.25 12.7 mm / 0.50 in 39.7 mm / 1.56 in
C 1.5 12.9 mm / 0.51 in 40.4 mm / 1.59 in
C 1/2 1.75 1 13.1 mm / 0.52 in 41.0 mm / 1.61 in
D 2 2 13.3 mm / 0.52 in 41.7 mm / 1.64 in
D 1/2 2.25 13.5 mm / 0.53 in 42.3 mm / 1.67 in
E 2.5 3 13.7 mm / 0.54 in 42.9 mm / 1.69 in
E 1/2 2.75 13.9 mm / 0.55 in 43.6 mm / 1.72 in
F 3 44 4 4 14.1 mm / 0.56 in 44.2 mm / 1.74 in
F 1/2 45 4.5 5 8 14.3 mm / 0.56 in 44.8 mm / 1.76 in
G 3.5 14.5 mm / 0.57 in 45.5 mm / 1.79 in
G 1/2 3.75 46 5 6 9 14.7 mm / 0.58 in 46.1 mm / 1.81 in
H 4 14.9 mm / 0.59 in 46.8 mm / 1.84 in
H 1/2 4.25 47 5.5 7 10 15.1 mm / 0.59 in 47.4 mm / 1.87 in
I 4.5 48 6 8 11 15.3 mm / 0.60 in 48.0 mm / 1.89 in
I 1/2 15.4 mm / 0.61 in 48.3 mm / 1.90 in
J 4.75 15.5 mm / 0.61 in 48.7 mm / 1.92 in
J 1/2 5 49 6.5 9 12 15.7 mm / 0.62 in 49.3 mm / 1.94 in
K 5.25 50 7 10 13 15.9 mm / 0.63 in 50.0 mm / 1.97 in
K 1/2 5.5 16.1 mm / 0.63 in 50.6 mm / 1.99 in
L 5.75 51 7.5 11 16.3 mm / 0.64 in 51.2 mm / 2.02 in
L 1/2 6 52 15 16.5 mm / 0.65 in 51.9 mm / 2.04 in
M 6.25 8 12 16.7 mm / 0.66 in 52.5 mm / 2.07 in
M 1/2 6.5 53 8.5 16 16.9 mm / 0.67 in 53.1 mm / 2.09 in
N 6.75 13 17.1 mm / 0.67 in 53.8 mm / 2.12 in
N 1/2 7 54 9 14 17 17.3 mm / 0.68 in 54.4 mm / 2.14 in
O 7.25 55 9.5 18 17.5 mm / 0.69 in 55.1 mm / 2.17 in
O 1/2 7.5 15 17.7 mm / 0.70 in 55.7 mm / 2.19 in
P 7.75 56 10 19 17.9 mm / 0.70 in 56.3 mm / 2.22 in
P 1/2 8 57 10.5 16 20 18.1 mm / 0.71 in 57.0 mm / 2.24 in
Q 8.25 17 18.3 mm / 0.72 in 57.6 mm / 2.27 in
Q 1/2 8.5 58 11 21 18.5 mm / 0.73 in 58.3 mm / 2.30 in
R 8.75 59 11.5 18 22 18.8 mm / 0.74 in 58.9 mm / 2.32 in
R 1/2 9 19 19.0 mm / 0.75 in 59.5 mm / 2.34 in
S 9.25 60 12 23 19.2 mm / 0.76 in 60.2 mm / 2.37 in
S 1/2 9.5 61 12.5 20 24 19.4 mm / 0.76 in 60.8 mm / 2.39 in
T 9.75 19.6 mm / 0.77 in 61.4 mm / 2.42 in
T 1/2 10 62 13 21 25 19.8 mm / 0.78 in 62.1 mm / 2.44 in
U 10.25 20.0 mm / 0.79 in 62.7 mm / 2.47 in
U 1/2 10.5 63 13.5 22 26 20.2 mm / 0.80 in 63.4 mm / 2.50 in
V 10.75 64 14 23 27 20.4 mm / 0.80 in 64.0 mm / 2.52 in
V 1/2 11 20.6 mm / 0.81 in 64.6 mm / 2.54 in
W 11.25 65 14.5 24 28 20.8 mm / 0.82 in 65.3 mm / 2.57 in
W 1/2 66 15 25 29 21.0 mm / 0.83 in 65.9 mm / 2.59 in
X 11.5 21.2 mm / 0.83 in 66.6 mm / 2.62 in
X 1/2 11.75 67 15.5 26 30 21.4 mm / 0.84 in 67.2 mm / 2.65 in
Y 12.25 16 21.6 mm / 0.85 in 67.8 mm / 2.67 in
Y 1/2 68 27 31 21.7 mm / 0.85 in 68.1 mm / 2.68 in
Z 12.5 21.8 mm / 0.86 in 68.5 mm / 2.70 in
Z 1/2 69 16.5 28 32 22.0 mm / 0.87 in 69.1 mm / 2.72 in
Z+1 30 34 22.6 mm / 0.89 in 71.0 mm / 2.80 in
Z+2 35 23.0 mm / 0.91 in 72.3 mm / 2.85 in
Z+3 23.2 mm / 0.91 in 72.9 mm / 2.87 in
Z+4 23.6 mm / 0.93 in 74.2 mm / 2.92 in