RING SIZE CHART AND CONVERSION

RING SIZE CONVERSION CHART
AUSTRALIA / EUROPE
USA / CANADA
INTERNAL DIAMETER (MM)
INTERNAL CIRCUMFERENCE (MM)
G
3 1/2
14.5 mm
45.5 mm
G 1/2
3 3/4
14.56 mm
46.1 mm
H 4 14.9 mm 46.7 mm
H 1/2 4 1/4 15.1 mm 47.4 mm
I 4 1/2 15.3 mm 48 mm
J 4 3/4 15.5 mm 48.7 mm
J 1/2 5 15.7 mm 49.3 mm
K 5 1/4 15.9 mm 49.9 mm
K 1/2 5 1/2 16.1 mm 50.6 mm
L 5 3/4 16.3 mm 51.2 mm
L 1/2 6 16.5 mm 51.8 mm
M 6 1/4 16.7 mm 52.5 mm
M 1/2 6 1/2 16.9 mm 53.1 mm
N 6 3/4 17.1 mm 53.8 mm
N 1/2 7 17.3 mm 54.4 mm
O 7 1/4 17.5 mm 55 mm
O 1/2 7 1/2 17.7 mm 55.7 mm
P 7 3/4 17.9 mm 56.3 mm
P 1/2 8 18.1 mm 56.9 mm
Q 8 1/4 18.3 mm 57.6 mm
Q 1/2 8 1/2 18.5 mm 58.2 mm
R 8 3/4 18.7 mm 58.9 mm
R 1/2 9 18.9 mm 59.5 mm
S 9 1/4 19.2 mm 60.1 mm
S 1/2 9 1/2 19.4 mm 60.8 mm
T 9 3/4 19.6 mm 61.4 mm
T 1/2 10 19.8 mm 62.1 mm
U 10 1/4 20 mm 62.7 mm
U 1/2 10 1/2 20.2 mm 63.3 mm
V 10 3/4 20.4 mm 64 mm
V 1/2 11 20.6 mm 64.6 mm
W 11 1/4 20.8 mm 65.2 mm
W 1/2 11 1/2 21 mm 65.9 mm
X 11 3/4 21.2 mm 66.5 mm
X 1/2 12 21.4 mm 67.2 mm
Y 12 1/4 21.6 mm 67.8 mm
Z 12 1/2 21.8 mm 68.4 mm