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Ring Size Inner Diameter Inner Circumference
(mm) (mm)
(mm) (mm)
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0 11.6 36.5
0.25 11.8 37.2
0.25 11.8 37.2
0.5 12.0 37.8
0.75 12.2 38.4
1 12.4 39.1
1.25 12.6 39.7
1.5 12.9 40.4
1.75 13.1 41.0
2 13.3 41.6
2.25 13.5 42.3
2.5 13.7 42.9
2.75 13.9 43.5
3 14.1 44.2
3.25 14.3 44.8
3.5 14.5 45.5
3.75 14.7 46.1
4 14.9 46.7
4.25 15.1 47.4
4.5 15.3 48.0
4.75 15.5 48.7
5 15.7 49.3
5.25 15.9 49.9
5.5 16.1 50.6
5.75 16.3 51.2
6 16.5 51.8
6.25 16.7 52.5
6.5 16.9 53.1
6.75 17.1 53.8
7 17.3 54.4
7.25 17.5 55.0
7.5 17.7 55.7
7.75 17.9 56.3
8 18.1 56.9
8.25 18.3 57.6
8.5 18.5 58.2
8.75 18.7 58.9
9 18.9 59.5
9.25 19.2 60.1
9.5 19.4 60.8
9.75 19.6 61.4
10 19.8 62.1
10.25 20.0 62.7
10.5 20.2 63.3
10.75 20.4 64.0
11 20.6 64.6
11.25 20.8 65.2
11.5 21.0 65.9
11.75 21.2 66.5
12 21.4 67.2
12.25 21.6 67.8
12.5 21.8 68.4
12.75 22.0 69.1
13 22.2 69.7
13.25 22.4 70.3
13.5 22.6 71.0
13.75 22.8 71.6
14 23.0 72.3
14.25 23.2 72.9
14.5 23.4 73.5
14.75 23.6 74.2
15 23.8 74.8
15.25 24.0 75.4
15.5 24.2 76.1
15.75 24.4 76.7
16 24.6 77.4
Click here for a guide to UK Ring Sizes & Measurements
Guide created: 10/12/08 (updated 31/07/11)
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