Ring Size Guide

Inside Diameter (inches)	Inside Diameter (mm)	Inside Circumference (inches)	Inside Circumference (mm)	Ring Size UK	Ring Size USA	Ring Size Europe
0.59	15.2	1.86	47.4	I	4¼	47½
0.60	15.4	1.89	48.0	I½	4½	48
0.61	15.6	1.92	48.7	J	4¾	48½
0.62	15.8	1.94	49.3	J½	5	49
0.63	16.0	1.97	50.0	K	5¼	50
0.63	16.1	1.99	50.6	K½	5½	50½
0.64	16.4	2.02	51.1	L	5¾	51
0.65	16.6	2.04	51.9	L½	6	52
0.66	16.8	2.07	52.5	M	6¼	52½
0.67	17	2.09	53.1	M½	6½	53
0.67	17.2	2.12	53.8	N	6¾	53½
0.68	17.4	2.14	54.4	N½	7	54
0.69	17.6	2.17	55.1	O	7¼	55
0.70	17.8	2.19	55.7	O½	7½	55½
0.71	18.0	2.22	56.3	P	7¾	56
0.71	18.2	2.24	57.0	P½	8	57
0.72	18.4	2.27	57.6	Q	8¼	57½
0.73	18.6	2.29	58.3	Q½	8½	58
0.74	18.8	2.32	58.9	R	8¾	59