The Length In mm The Length In In AU Ring Size US Ring Size
41.6mm 1.639 in. D 2
42.3mm 1.664 in. D 1/2 2 1/4
42.9mm 1.689 in. E 2 1/2
43.5mm1.714 in.E 1/22 3/4
44.2mm1.740 inF3
44.8mm1.765in.F 1/23 1/4
45.5mm1.790 in.G3 1/2
46.1mm1.815 in.G 1/23 3/4
46.7mm1.840 in.H4
47.4mm1.865 in.H 1/24 1/4
48.0mm1.890 in.I4 1/2
48.7mm1.915 in.J4 3/4
49.3mm1.941 in.J 1/25
49.9mm1.966 in.K5 1/4
50.6mm1.991 in.K 1/25 1/2
51.2mm2.016 in.L5 3/4
51.8mm2.041 inL 1/26
52.5mm2.066 in.M6 1/4
53.1mm2.091 in.M 1/26 1/2
53.8mm2.116 in.N6 3/4
54.4mm2.141 in.N 1/27
55.0mm2.167 in.O7 1/4
55.7mm2.192 in.O 1/27 1/2
56.3mm2.217 in.P7 3/4
56.9mm2.242 in.P 1/28
57.6mm2.267 in.Q8 1/4
58.2mm2.292 in.Q 1/28 1/2
58.9mm2.317 inR8 3/4
59.5mm2.342 in.R 1/29
60.1mm2.368 in.S9 1/4
60.8mm2.393 in.S 1/29 1/2
61.4mm2.418 in.T9 3/4
62.1mm2.443 in.T 1/210
62.7mm2.468 in.U10 1/4
63.3mm2.493 in.U 1/210 1/2
64.0mm2.518 in.V10 3/4
64.6mm2.543 in.V 1/211
65.2mm2.569 in.W11 1/4
65.9mm2.594 in.W 1/211 1/2
66.5mm2.619 inX11 3/4
67.2mm2.644 in.X 1/212
67.8mm2.669 in.Y12 1/4
68.4mm2.694 in.Z12 1/2
69.1mm2.719 in.Z 1/212 3/4
69.7mm2.744 in. 13
70.3mm2.769 in.Z113 1/4
71.0mm2.795 in. 13 1/2
71.6mm2.820 in.Z213 3/4
72.3mm2.845 in.Z314
72.9mm2.870 in. 14 1/4
73.5mm2.895 in.Z414 1/2
74.2mm2.920 in 14 3/4
74.8mm2.945 in. 15
75.4mm2.970 in. 15 1/4
76.1mm2.996 in. 15 1/2
76.7mm3.021 in. 15 3/4