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Measure the internal diameter or circumference of a ring of yours.
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Circumference	Internal Diameter	GDP / IT	UK	USA
41 mm	13 mm	1
42 mm	13,3 mm	2
43 mm	13,6 mm	3
44 mm	14 mm	4	F	3
45 mm	14,3 mm	5	F 1/2
46 mm	14,6 mm	6	G	3 1/2
47 mm	14,9 mm	7	H	4
48 mm	15,3 mm	8	I	4 1/2
49 mm	15,6 mm	9	J	5
50 mm	16 mm	10	K	5 1/2
51 mm	16,2 mm	11	L
52 mm	16,5 mm	12	L 1/2	6
53 mm	16,8 mm	13	M 1/2	6 1/2
54 mm	17,2 mm	14	N	7
55 mm	17,4 mm	15	O
56 mm	17,8 mm	16	O 1/2	7 1/2
57 mm	18,1 mm	17	P 1/2	8
58 mm	18,5 mm	18	Q	8 1/2
59 mm	18,8 mm	19	R	9
60 mm	19,1 mm	20	S	9 1/2
61 mm	19,5 mm	21	T	10

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