Ring Size Chart

Please Note: All equivalents are approximate.
US. & Canadian Standard	Inside Diameter mm	Inside Circ. mm	Equivalents
US. & Canadian Standard	Inside Diameter mm	Inside Circ. mm	British	French	German	Swiss
5	15.7	49	j ½	49	15¾	9
5 ½	16.1	50.2	L	50¼	16	—
6	16.51	51.5	M	51 ½	16 ½	12
6 ½	16.92	52.8	N	52¾	17	13
7	17.35	54	N ½	54	17¼	14
7 ½	17.63	55.3	O ½	55 ½	17 ½	15
8	18.19	56.6	P ½	56¾	18	16
8 ½	18.59	57.8	Q ½	58	18 ½	17
9	18.99	59.1	R ½	59¼	19	18
9 ½	19.41	60.3	S ½	60 ½	19 ½	19
10	19.84	61.6	T ½	61¾	20	20