Ring size chart

Ring Size	Inside Diameter (inches)	Inside Diameter (mm)	Inside Circumference (inches)	Inside Circumference (mm)
4	0.586	14.88	1.84	46.8
4 1/2	0.602	15.29	1.89	48
5	0.618	15.7	1.94	49.3
5 1/2	0.634	16.1	1.99	50.6
6	0.65	16.51	2.04	51.9
6 1/2	0.666	16.92	2.09	53.1
7	0.682	17.32	2.14	54.4
7 1/2	0.698	17.73	2.19	55.7
8	0.714	18.14	2.24	57
8 1/2	0.73	18.54	2.29	58.3
9	0.746	18.95	2.34	59.5
9 1/2	0.762	19.35	2.39	60.8
10	0.778	19.76	2.44	62.1
10 1/2	0.794	20.17	2.49	63.4
11	0.81	20.57	2.54	64.6
11 1/2	0.826	20.98	2.59	65.9
12	0.842	21.39	2.65	67.2