Ring Size Guide
UK Size | Inside Diameter (mm) | US | | | UK | Inside Diameter (mm) | US |
G | 14.36 | 3.3375 | | | G 1/2 | 14.56 | 3.625 |
H | 14.65 | 3.75 | | | H 1/2 | 14.86 | 4 |
I | 15.04 | 4.25 | | | I 1/2 | 15.27 | 4.5 |
J | 15.40 | 4.625 | | | J 1/2 | 15.70 | 5 |
K | 15.80 | 5.125 | | | K 1/2 | 16.00 | 5.375 |
L | 16.10 | 5.5 | | | L 1/2 | 16.41 | 5.875 |
M | 16.51 | 6 | | | M 1/2 | 16.71 | 6.25 |
N | 16.92 | 6.5 | | | N 1/2 | 17.13 | 6.75 |
O | 17.35 | 7 | | | O 1/2 | 17.45 | 7.25 |
P | 17.75 | 7.5 | | | P 1/2 | 17.97 | 7.75 |
Q | 18.19 | 8 | | | Q 1/2 | 18.35 | 8.25 |
R | 18.61 | 8.625 | | | R 1/2 | 18.80 | 8.875 |
S | 19.10 | 9.125 | | | S 1/2 | 19.31 | 9.375 |
T | 19.51 | 9.625 | | | T 1/2 | 19.84 | 10 |
U | 20.02 | 10.25 | | | U 1/2 | 20.20 | 10.5 |
V | 20.32 | 10.625 | | | V 1/2 | 20.68 | 11 |
W | 20.76 | 11.125 | | | W 1/2 | 20.94 | 11.375 |
X | 21.18 | 11.625 | | | X 1/2 | 21.30 | 11.875 |
Y | 21.49 | 12 | | | Y 1/2 | 21.69 | 12.25 |
Z | 21.89 | 12.5 | | | Z 1/2 | 22.10 | 12.75 |