Ring size chart.

How to determine the diameter:
  1. Wrap a piece of string around your finger and indicate where it meets the string end
  2. Measure the length of string by using a ruler to get finger circumference
  3. If you want, you can now calculate the diameter by using this equation: diameter=circumference/3.14

Ring size conversion

Covert ring sizes by using our ring size conversion table


Ring size conversion table

US/
Canada
UK/
Australia
Japan China Diameter
(inch)
Diameter
(mm)
Circumference
(inch)
Circumference
(mm)
0 - - - 0.458 11.63 1.44 36.5
¼ - - - 0.466 11.84 1.46 37.2
½ A - - 0.474 12.04 1.49 37.8
¾ - - 0.482 12.24 1.51 38.5
1 B 1 1 0.49 12.45 1.54 39.1
- - 0.498 12.65 1.56 39.7
C - - 0.506 12.85 1.59 40.4
- - 0.514 13.06 1.61 41.0
2 D 2 2 0.522 13.26 1.64 41.7
- - 0.53 13.46 1.67 42.3
E 3 3 0.538 13.67 1.69 42.9
- - 0.546 13.87 1.72 43.6
3 F 4 4 0.554 14.07 1.74 44.2
5 5 0.562 14.27 1.77 44.8
G - - 0.57 14.48 1.79 45.5
6 6 0.578 14.68 1.82 46.1
4 H 7 7 0.586 14.88 1.84 46.8
- - 0.594 15.09 1.87 47.4
I 8 8 0.602 15.29 1.89 48.0
J - - 0.61 15.49 1.92 48.7
5 9 9 0.618 15.70 1.94 49.3
K - - 0.626 15.90 1.97 50.0
10 10 0.634 16.10 1.99 50.6
L - - 0.642 16.31 2.02 51.2
6 11 11 0.65 16.51 2.04 51.9
M 12 12 0.658 16.71 2.07 52.5
13 13 0.666 16.92 2.09 53.1
N - - 0.674 17.12 2.12 53.8
7 14 14 0.682 17.32 2.14 54.4
O - - 0.69 17.53 2.17 55.1
15 15 0.698 17.73 2.19 55.7
P - - 0.706 17.93 2.22 56.3
8 16 16 0.714 18.14 2.24 57.0
Q - - 0.722 18.34 2.27 57.6
17 17 0.73 18.54 2.29 58.3
R - - 0.738 18.75 2.32 58.9
9 18 18 0.746 18.95 2.34 59.5
S - - 0.754 19.15 2.37 60.2
19 19 0.762 19.35 2.39 60.8
T - - 0.77 19.56 2.42 61.4
10 20 20 0.778 19.76 2.44 62.1
10¼ U 21 21 0.786 19.96 2.47 62.7
10½ 22 22 0.794 20.17 2.49 63.4
10¾ V - - 0.802 20.37 2.52 64.0
11 23 23 0.81 20.57 2.54 64.6
11¼ W - - 0.818 20.78 2.57 65.3
11½ 24 24 0.826 20.98 2.59 65.9
11¾ X - - 0.834 21.18 2.62 66.6
12 25 25 0.842 21.39 2.65 67.2
12¼ Y - - 0.85 21.59 2.67 67.8
12½ Z 26 26 0.858 21.79 2.70 68.5
12¾ - - 0.866 22.00 2.72 69.1
13 - 27 27 0.874 22.20 2.75 69.7
13¼ Z1 - - 0.882 22.40 2.77 70.4
13½ - - - 0.89 22.61 2.80 71.0
13¾ Z2 - - 0.898 22.81 2.82 71.7
14 Z3 - - 0.906 23.01 2.85 72.3
14¼ - - - 0.914 23.22 2.87 72.9
14½ Z4 - - 0.922 23.42 2.90 73.6
14¾ - - - 0.93 23.62 2.92 74.2
15 - - - 0.938 23.83 2.95 74.8
15¼ - - - 0.946 24.03 2.97 75.5
15½ - - - 0.954 24.23 3.00 76.1
15¾ - - - 0.962 24.43 3.02 76.8
16 - - - 0.97 24.64 3.05 77.4