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Ring Size Conversion Chart

22 May 2019

You can use our handy ring size guide to convert your measurements to and from different country-specific sizes including UK, Ireland, Australia, United States (US), Canada, Chine, Switzerland, Japan and European sizes.

If you would like to print this out, you can download our printable Ring Size Conversion Chart (102kb PDF)

United Kingdom,
Ireland,
and Australia
United States
and Canada
Inside diameter
(mm)
European Size, Inside Circumference (mm)China,
Japan
Switzerland
- 0000 9.91 31.13 - -
- 00 10.72 33.68 - -
- 0 11.53 36.22 - -
A 1/2 11.95 37.54 - -
A 1/2 3/4 12.18 38.26 - -
B 1 12.37 38.86 1 -
B 1/2 1 1/4 12.60 39.58 - -
C 1 1/2 12.78 40.15 - -
C 1/2 1 3/4 13.00 40.84 - -
D 2 13.21 41.50 2 1 1/2
D 1/2 2 1/4 13.41 42.13 - -
E 2 1/2 13.61 42.76 3 2 3/4
E 1/2 2 3/4 13.83 43.45 - -
F 3 14.05 44.14 4 4
F 1/2 3 1/8 14.15 44.45 - -
G 3 3/8 14.36 45.11 5 5 1/4
G 1/2 3 5/8 14.56 45.74 6 -
H 3 3/4 14.65 46.10 - 6 1/2
H 1/2 4 14.86 46.68 7 -
I 4 1/4 15.04 47.40 - 7 3/4
I 1/2 4 1/2 15.27 48.00 8 -
J 4 5/8 15.40 48.70 - 9
J 1/2 5 15.70 49.30 9 -
K 5 1/8 15.80 50.00 - 10
K 1/2 5 3/8 16.00 50.60 10 -
L 5 1/2 16.10 51.20 - 11 3/4
L 1/2 5 7/8 16.41 51.85 - -
M 6 16.51 52.50 12 12 3/4
M 1/2 6 1/4 16.71 53.10 - -
N 6 1/2 16.92 53.80 13 14
N 1/2 6 3/4 17.13 54.40 - -
O 7 17.35 55.00 14 15 1/4
O 1/2 7 1/4 17.45 55.70 - -
P 7 1/2 17.75 56.20 15 16 1/2
P 1/2 7 3/4 17.97 56.80 - -
Q 8 18.19 57.40 16 17 3/4
Q 1/2 8 1/4 18.35 58.00 - -
R 8 5/8 18.61 58.90 - 19
R 1/2 8 7/8 18.80 59.40 - -
S 9 1/8 19.10 60.00 - 20 1/4
S 1/2 9 3/8 19.31 60.66 - -
T 9 5/8 19.51 61.29 - 21 1/2
T 1/2 10 19.84 62.33 20 -
U 10 1/4 20.02 62.89 21 22 3/4
U 1/2 10 1/2 20.20 63.46 22 -
V 10 5/8 20.32 63.84 - 23 3/4
V 1/2 11 20.68 64.97 23 -
W 11 1/8 20.76 65.22 - 25
W 1/2 11 3/8 20.94 65.78 - -
X 11 5/8 21.18 66.54 - 26 1/4
X 1/2 11 7/8 21.30 66.92 - -
Y 12 21.49 67.51 25 27 1/2
Y 1/2 12 1/4 21.69 68.14 - -
Z 12 1/2 21.89 68.77 26 28 3/4
Z +1/2 12 3/4 22.10 69.43 - -
Z+1 13 22.33 70.15 27 -
Z+1.5 13.5 22.60 71.00 - -
Z+2 - 22.69 71.28 - -
Z+2.5 - 22.92 72.00 - -
Z+3 - 23.06 72.45 - -
Z+3.5 - 23.24 73.01 - -
Z+4 - 23.47 73.73 - -
Z+4.5 - 23.55 73.98 - -
Z+5 - 23.87 74.99 - -
Z+6 - 24.27 76.25 - -

 

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