guide_ring_conversion

International Ring Size Chart

We are pleased to present the most accurate American to British ring size conversion chart on the web.
United States and Canada UK, Australia, New Zealand, South Africa Diameter Variance (mm)
Circumference (mm) Diameter (mm) Ring Size Circumference (mm) Diameter (mm) Ring Size
36.5 11.6 0
37.2 11.8 37.5 11.9 A -0.10
37.8 12.0 38.1 12.1 A -0.10
38.5 12.2 38.8 12.3 B -0.09
39.1 12.4 1 39.4 12.5 B -0.09
39.7 12.6 1 40.0 12.7 C -0.09
40.4 12.8 1 40.6 12.9 C -0.08
41.0 13.1 1 41.3 13.1 D -0.08
41.6 13.3 2 41.9 13.3 D -0.07
42.3 13.5 2 42.5 13.5 E -0.07
42.9 13.7 2 43.1 13.7 E -0.07
43.6 13.9 2 43.8 13.9 F -0.06
44.2 14.1 3 44.4 14.1 F -0.06
44.8 14.3 3 45.0 14.3 G -0.05
45.5 14.5 3 45.6 14.5 G -0.05
46.1 14.7 3 46.3 14.7 H -0.04
46.8 14.9 4 46.9 14.9 H -0.04
47.4 15.1 4 47.5 15.1 I -0.04
48.0 15.3 4 48.1 15.3 I -0.03
48.7 15.5 4 48.8 15.5 J -0.03
49.3 15.7 5 49.4 15.7 J -0.02
49.9 15.9 5 50.0 15.9 K -0.02
50.6 16.1 5 50.6 16.1 K -0.01
51.2 16.3 5 51.3 16.3 L -0.01
51.9 16.5 6 51.9 16.5 L -0.01
52.5 16.7 6 52.5 16.7 M 0.00
53.1 16.9 6 53.1 16.9 M 0.00
53.8 17.1 6 53.8 17.1 N 0.01
54.4 17.3 7 54.4 17.3 N 0.01
55.0 17.5 7 55.0 17.5 O 0.02
55.7 17.7 7 55.6 17.7 O 0.02
56.3 17.9 7 56.3 17.9 P 0.02
57.0 18.1 8 56.9 18.1 P 0.03
57.6 18.3 8 57.5 18.3 Q 0.03
58.2 18.5 8 58.1 18.5 Q 0.04
58.9 18.7 8 58.8 18.7 R 0.04
59.5 18.9 9 59.4 18.9 R 0.05
60.2 19.1 9 60.0 19.1 S 0.05
60.8 19.4 9 60.6 19.3 S 0.05
61.4 19.6 9 61.3 19.5 T 0.06
62.1 19.8 10 61.9 19.7 T 0.06
62.7 20.0 10 62.5 19.9 U 0.07
63.3 20.2 10 63.1 20.1 U 0.07
64.0 20.4 10 63.8 20.3 V 0.08
64.6 20.6 11 64.4 20.5 V 0.08
65.3 20.8 11 65.0 20.7 W 0.08
65.9 21.0 11 65.6 20.9 W 0.09
66.5 21.2 11 66.3 21.1 X 0.09
67.2 21.4 12 66.9 21.3 X 0.10
67.8 21.6 12 67.5 21.5 Y 0.10
68.5 21.8 12 68.1 21.7 Y 0.11
69.1 22.0 12 68.8 21.9 Z 0.11
69.7 22.2 13 69.4 22.1 Z 0.11
70.4 22.4 13 70.0 22.3 Z1 0.12
71.0 22.6 13 70.6 22.5 Z1 0.12
71.6 22.8 13 71.3 22.7 Z2 0.13
72.3 23.0 14 71.9 22.9 Z2 0.13
72.9 23.2 14 72.5 23.1 Z3 0.13
73.6 23.4 14 73.1 23.3 Z3 0.14
74.2 23.6 14 73.8 23.5 Z4 0.14
74.8 23.8 15 74.4 23.7 Z4 0.15
75.5 24.0 15 75.0 23.9 Z5 0.15
76.1 24.2 15 75.6 24.1 Z5 0.16
76.8 24.4 15 76.3 24.3 Z6 0.16
77.4 24.6 16 76.9 24.5 Z6 0.16
** The diameter variance is the difference between the American Sizes and the British sizes. For example, a US size 4 has a diameter of 14.9mm (rounded up) and a UK H 1/2 has a diameter of 14.9 (rounded down). Because of rounding, the US size 4 is 0.04 mm smaller than the UK H 1/2.
 
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