Discover your ring size.

Inter-diameter (mm)	EU Size	US Size	UK Size
14.1mm	44	3	F 1/2
14.3mm	45		G
14.5mm		3.5	G 1/2
14.7mm	46		H
14.9mm	47	4	H 1/2
15.1mm			I
15.3mm	48	4.5	I 1/2
15.5mm			J
15.7mm	49	5	J 1/2
15.9mm	50		K
16.1mm		5.5	K 1/2
16.3mm	51		L
16.5mm	52	6	L 1/2
16.7mm			M
16.9mm	53	6.5	M 1/2
17.1mm			N
17.3mm	54	7	N 1/2
17.5mm	55	O
17.7mm		O 1/2