The best way to take the size of your finger
is to measure the inside diameter of a ring that fits your finger well.

The measure has to be taken if possible with a precision caliper,
and must be expressed in millimeters.

Tenths of millimeters are also very important:
for example number 15 on the European scale
corresponds to an inside diameter of 17.4 mm.

For the measure refer to the following table:

SIZES
INSIDE DIAMETER MM.	EUROPEAN	FRENCH	USA	UK
14.6 mm.	06	46	3.75	H
14.9 mm.	07	47	4.25	I
15.2 mm.	08	48	4.50	I-1/2
15.6 mm.	09	49	4.75	J
15.9 mm.	10	50	5.25	K
16.2 mm.	11	51	5.75	L-1/2
16.5 mm.	12	52	6.25	M-1/4
16.8 mm.	13	53	6.50	N
17.1 mm.	14	54	6.75	N-3/4
17.4 mm.	15	55	7.25	O-1/4
17.8 mm.	16	56	7.50	P
18.0 mm.	17	57	8.00	Q
18.4 mm.	18	58	8.25	Q-1/2
18.6 mm.	19	59	8.75	R
19.0 mm.	20	60	9.25	S-1/4
19.4 mm.	21	61	9.50	S-3/4
19.6 mm.	22	62	10.00	T-1/2
20.0 mm.	23	63	10.25	U-1/4
20.4 mm.	24	64	10.75	V
20.7 mm.	25	65	11.00	W
20.9 mm.	26	66	11.25	X
21.2 mm.	27	67	11.75	X-3/4
21.6 mm.	28	68	12.25	Y-1/2
21.9 mm.	29	69	12.75	Z
22.2 mm.	30	70	13.25	Z-3/4

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