The ring size converter tool converts your ring size from cm to mm and vice versa.

You can always use the ring size converter to find your exact ring size.

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Ring size converter

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[oppso_unit_converter converter=distance]

Now use the ring size conversion chart to determine your exact ring size 

Size in MM	US & Canada	UK	Japan	France	Switzerland	Germany
44.1	3	F	4	44	4	14
45.4	3 1/2	G	5	45 1/4	5 1/4	14 1/2
46.7	4	H 1/2	7	46 1/2	6 1/2	15
48.0	4 1/2	I 1/2	8	47 3/4	7 3/4	15 1/2
49.2	5	J 1/2	9	49	9	15 3/4
50.5	5 1/2	K 1/2	10	50 1/4	10 1/4	16 1/4
51.8	6	L 1/2	12	51 1/2	11 1/2	16 1/2
53.1	6 1/2	M 1/2	13	52 3/4	12 3/4	17
54.3	7	O	14	54	14	17 1/4
55.6	7 1/2	P	15	55 1/4	15 1/4	17 3/4
56.9	8	Q	16	56 1/2	16 1/2	18
58.2	8 1/2	R	17	57 3/4	17 3/4	18 1/2
59.4	9	S	18	59	19	19
60.7	9 1/2	—	19	60 1/4	20 1/4	19 1/2
62.0	10	T 1/2	20	61 1/2	21 1/2	20
63.3	10 1/2	U 1/2	22	62 3/4	22 3/4	20 1/2
64.5	11	V 1/2	23	64	24	20 3/4
65.8	11 1/2	W 1/2	24	65 1/4	25 1/4	21
67.1	12	Y	25	66 1/2	26 1/2	21 1/4
68.3	12 1/2	Z	26	67 3/4	27 3/4	21 3/4
69.6	13	—	27	69	29	22