Planet Silver Information

Conversion for International Ring Sizes

Use this chart to convert your local standard to the US ring sizes for ordering. You can also calculate the size in millimeters of the diameter or metric as well.

US size	Dia. -inch	Dia. in mm	Metric -mm	British	French	German	Japanese	Swiss
6	.650	16.51	51.5	M	52 3/4	16 1/2	12	12 3/4
7	.683	17.35	54.0	O	55 1/4	17 1/4	14	15 1/4
8	.716	18.19	56.6	Q	57 3/4	18	16	17 3/4
9	.748	18.89	59.1	-	-	19	18
10	.781	19.84	61.6	T 1/2	-	20	20
11	.814	20.68	64.1	V 1/2	-	20 3/4	23
12	.846	21.49	66.6	Y	67 1/2	21 1/4	25	27 1/2
13	.879	22.33	69.1	-	-	22	27