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InternationalRing Size Chart

USA,
Canada &
Mexico
UK,
Ireland,
Australia &
NZ
China,
Japan &
South America
India Italy,
Spain,
Netherlands &
Switzerland
Inner
diameter
(in)
Outer
diameter
(mm)
Inner
Circumference
(in)
Outer
Circumference
(mm)
1 B 1     0.49 12.45 1.54 39.1
1 1/2 C     0.5 0.506 12.85 1.59 40.4
2 D 2 2 1.75 0.522 13.26 1.64 41.7
2 1/2 E 3 3 3 0.538 13.67 1.69 42.9
3 F 4   4.25 0.554 14.07 1.74 44.2
3 1/2 G     5.5 0.57 14.48 1.79 45.5
4 H 7   6.75 0.586 14.88 1.84 46.8
4 1/2 I 8 8 8 0.602 15.29 1.89 48
5 9   9.25 0.618 15.7 1.94 49.3
5 1/2 10   10.5 0.634 16.1 1.99 50.6
6 11 12 11.75 0.65 16.51 2.04 51.9
6 1/2 13 13 13.25 0.666 16.92 2.09 53.1
7 14 14 14.5 0.682 17.32 2.14 54.4
7 1/2 15   15.75 0.698 17.73 2.19 55.7
8 16 17 17 0.714 18.14 2.24 57
8 1/2 17 18 18.25 0.73 18.54 2.29 58.3
9 18   19.5 0.746 18.95 2.34 59.5
9 1/2 19 21 20.75 0.762 19.35 2.39 60.8
10 20 22 22 0.778 19.76 2.44 62.1
10 1/2 22   23.25 0.794 20.17 2.49 63.4
11 23 25 24.75 0.81 20.57 2.54 64.6
11 1/2 24 26 26 0.826 20.98 2.59 65.9
12 25 27 27.25 0.842 21.39 2.65 67.2
12 1/2 Z 26   28.5 0.858 21.79 2.7 68.5
13   27 30 29.75 0.874 22.2 2.75 69.7
13 1/2     31 31 0.89 22.61 2.8 71
14 Z3     32.25 0.906 23.01 2.85 72.3
14 1/2 Z4     33.5 0.922 23.42 2.9 73.6
15     35 34.75 0.938 23.83 2.95 74.8
15 1/2     36 36.25 0.954 24.23 3 76.1
16     37 37.5 0.97 24.64 3.05 77.4
  • Rings' Sizes on 316Steel.com are calibrated/measured by USA scale
  • All rings' sizes are approximate. Actual sizes may slightly vary.
If you have any questions or need additional info, please contact us


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