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Ring Size Chart How to determine your ring size Wrap a piece of string around your finger. Mark the point where the two ends meet. Measure the string against a ruler to get the circumference of your finger. Look up your ring size using the table below.

U.S.A. Size	British / Australian Size	German Size	Circumferece (mm)	Diameter (mm)
4.5	I - 1/2	15 1/4	47.8	15.27
5	J 1/2	15 3/4	49	15.70
5.5	L	16	50.3	16.10
6	M	16 1/2	51.5	16.51
6.5	N	17	52.8	16.92
7	O	17 1/4	54	17.35
7.5	P	17 3/4	55.3	17.75
8	Q	18	56.6	18.19
8.5	Q 1/2	18 1/2	57.8	18.53
9	R 1/2	19	59.1	18.89
9.5	S 1/2	19 1/2	60.3	19.41
10	T 1/2	20	61.6	19.84
10.5	U 1/2	20 1/4	62.8	20.20
11	V 1/2	20 3/4	64.1	20.68
11.5	W 1/2	21	65.3	21.08
12	Y	21 1/4	66.6	21.49
12.5	Z	21 3/4	67.9	21.89
13	--	22	69.1	22.33

Click here to see more information on choosing ring size for a comfort ring.