Ring Size Chart
UK | USA | France | Germany | Japan | Switzerland | Inside Diameter (mm) | Inside Diameter (inches) | Inside Circumference (mm) | Inside Circumference (inches) |
D | 2 | 41 1/2 | 13 1/2 | 2 | 1 1/2 | 13.21 | 0.52 | 41.5 | 1.63 |
D 1/2 | 2 1/4 | - | - | - | - | 13.41 | 0.528 | 42.13 | 1.66 |
E | 2 1/2 | 42 3/4 | 13 3/4 | 3 | 2 3/4 | 13.61 | 0.536 | 42.76 | 1.68 |
E 1/2 | 2 3/4 | - | - | - | - | 13.83 | 0.544 | 43.45 | 1.71 |
F | 3 | 44 | 14 | 4 | 4 | 14.05 | 0.553 | 44.14 | 1.74 |
F 1/2 | 3 1/8 | - | - | - | - | 14.15 | 0.557 | 44.45 | 1.75 |
F 3/4 | 3 1/4 | - | - | - | - | 14.25 | 0.561 | 44.77 | 1.76 |
G | 3 3/8 | 45 1/4 | - | 5 | 5 1/4 | 14.36 | 0.565 | 45.11 | 1.77 |
G 1/4 | 3 1/2 | - | 14 1/2 | - | - | 14.45 | 0.569 | 45.4 | 1.79 |
G 1/2 | 3 5/8 | - | - | 6 | - | 14.56 | 0.573 | 45.74 | 1.8 |
H | 3 3/4 | 46 1/2 | - | - | 6 1/2 | 14.65 | 0.577 | 46.02 | 1.81 |
H 1/2 | 4 | - | 15 | 7 | - | 14.86 | 0.585 | 46.68 | 1.84 |
I | 4 1/4 | 47 3/4 | - | - | 7 3/4 | 15.04 | 0.592 | 47.25 | 1.86 |
I 1/2 | 4 1/2 | - | 15 1/4 | 8 | - | 15.27 | 0.601 | 47.97 | 1.89 |
J | 4 5/8 | 49 | 15 1/2 | - | 9 | 15.4 | 0.606 | 48.38 | 1.9 |
J 1/4 | 4 3/4 | - | - | - | - | 15.53 | 0.611 | 48.79 | 1.92 |
J 1/2 | 5 | - | 15 3/4 | 9 | - | 15.7 | 0.618 | 49.32 | 1.94 |
K | 5 1/8 | 50 | - | - | 10 | 15.8 | 0.622 | 49.64 | 1.95 |
K 1/4 | 5 1/4 | - | - | - | - | 15.9 | 0.626 | 49.95 | 1.97 |
K 1/2 | 5 3/8 | - | - | 10 | - | 16 | 0.63 | 50.27 | 1.98 |
L | 5 1/2 | 51 3/4 | 16 | - | 11 3/4 | 16.1 | 0.634 | 50.58 | 1.99 |
L 1/4 | 5 3/4 | - | - | - | - | 16.3 | 0.642 | 51.21 | 2.02 |
L 1/2 | 5 7/8 | - | - | - | - | 16.41 | 0.646 | 51.55 | 2.03 |
M | 6 | 52 3/4 | 16 1/2 | 12 | 12 3/4 | 16.51 | 0.65 | 51.87 | 2.04 |
M 1/2 | 6 1/4 | - | - | - | - | 16.71 | 0.658 | 52.5 | 2.07 |
N | 6 1/2 | 54 | 17 | 13 | 14 | 16.92 | 0.666 | 53.16 | 2.09 |
N 1/2 | 6 3/4 | - | - | - | - | 17.13 | 0.674 | 53.82 | 2.12 |
O | 7 | 55 1/4 | 17 1/4 | 14 | 15 1/4 | 17.35 | 0.683 | 54.51 | 2.15 |
O 1/2 | 7 1/4 | - | - | - | - | 17.45 | 0.687 | 54.82 | 2.16 |
P | 7 1/2 | 56 1/2 | 17 3/4 | 15 | 16 1/2 | 17.75 | 0.699 | 55.76 | 2.2 |
P 1/2 | 7 3/4 | - | - | - | - | 17.97 | 0.707 | 56.45 | 2.22 |
Q | 8 | 57 3/4 | 18 | 16 | 17 3/4 | 18.19 | 0.716 | 57.15 | 2.25 |
Q 1/2 | 8 1/4 | - | - | - | - | 18.35 | 0.722 | 57.65 | 2.27 |
Q 3/4 | 8 1/2 | - | 18 1/2 | 17 | - | 18.53 | 0.729 | 58.21 | 2.29 |
R | 8 5/8 | 59 | - | - | 19 | 18.61 | 0.733 | 58.47 | 2.3 |
R 1/4 | 8 3/4 | - | - | - | - | 18.69 | 0.736 | 58.72 | 2.31 |
R 1/2 | 8 7/8 | - | - | - | - | 18.8 | 0.74 | 59.06 | 2.32 |
R 3/4 | 9 | - | 19 | 18 | - | 18.89 | 0.748 | 59.34 | 2.35 |
S | 9 1/8 | 60 1/4 | - | - | 20 1/4 | 19.1 | 0.752 | 60 | 2.36 |
S 1/4 | 9 1/4 | - | - | - | - | 19.22 | 0.757 | 60.38 | 2.38 |
S 1/2 | 9 3/8 | - | - | - | - | 19.31 | 0.76 | 60.66 | 2.39 |
S 3/4 | 9 1/2 | - | 19 1/2 | 19 | - | 19.41 | 0.764 | 60.98 | 2.4 |
T | 9 5/8 | 61 1/2 | - | - | 21 1/2 | 19.51 | 0.768 | 61.29 | 2.41 |
T 1/4 | 9 3/4 | - | - | - | - | 19.62 | 0.772 | 61.64 | 2.43 |
T 1/2 | 10 | - | 20 | 20 | - | 19.84 | 0.781 | 62.33 | 2.45 |
U | 10 1/4 | 62 3/4 | - | 21 | 22 3/4 | 20.02 | 0.788 | 62.89 | 2.48 |
U 1/2 | 10 1/2 | - | 20 1/4 | 22 | - | 20.2 | 0.797 | 63.46 | 2.5 |
V | 10 5/8 | 63 | - | - | 23 3/4 | 20.32 | 0.8 | 63.84 | 2.51 |
V 1/4 | 10 3/4 | - | - | - | - | 20.44 | 0.805 | 64.21 | 2.53 |
V 1/2 | 11 | - | 20 3/4 | 23 | - | 20.68 | 0.814 | 64.97 | 2.56 |
W | 11 1/8 | 65 | - | - | 25 | 20.76 | 0.817 | 65.22 | 2.57 |
W 1/4 | 11 1/4 | - | - | - | - | 20.85 | 0.821 | 65.5 | 2.58 |
W 1/2 | 11 3/8 | - | - | - | - | 20.94 | 0.824 | 65.78 | 2.59 |
W 3/4 | 11 1/2 | - | 21 | 24 | - | 21.08 | 0.83 | 66.22 | 2.61 |
X | 11 5/8 | 66 1/4 | - | - | 26 1/4 | 21.18 | 0.834 | 66.54 | 2.62 |
X 1/4 | 11 3/4 | - | - | - | - | 21.24 | 0.836 | 66.73 | 2.63 |
X 1/2 | 11 7/8 | - | - | - | - | 21.3 | 0.839 | 66.92 | 2.64 |
Y | 12 | 67 1/2 | 21 1/4 | 25 | 27 1/2 | 21.49 | 0.846 | 67.51 | 2.66 |
Y 1/2 | 12 1/4 | - | - | - | - | 21.69 | 0.854 | 68.14 | 2.68 |
Z | 12 1/2 | 68 3/4 | 21 3/4 | 26 | 28 3/4 | 21.89 | 0.862 | 68.77 | 2.71 |