This is a chart that will be extremely helpful for you to determine the ring size that you need. You can either make use of a tape or a small piece of string to measure the area that will be occupied by the ring. When it becomes a complete circle, make a mark on such string. This will be helpful for you to compare with the chart that is mentioned below.

Inside Diameter	Inside Circumference	SIZE
MM	MM	US / Canada	UK / Australia / South Africa	France / Germany	Italy	Spain	Japan
14.1	44.2	3	F	44	4	4.5	4
14.5	45.5	3.5	G	46	5	5.5	5
14.9	46.8	4	H	47	6	7	7
15.3	48	4.5	I	48	8	8	8
15.7	49.3	5	J-½	50	10	9.5	9
16.1	50.6	5.5	K-½	51	11	10.5	10
16.5	51.9	6	L-½	52	12	12	11
16.9	53.1	6.5	M-½	53	13	13	13
17.3	54.4	7	N-½	54	15	14.5	14
17.7	55.7	7.5	O-½	56	16	16	15
18.1	57	8	P-½	57	17	17	16
18.5	58.3	8.5	Q-½	58	18	18.5	17
19	59.5	9	R-½	59	20	19.5	18
19.4	60.8	9.5	S-½	61	21	21	20
19.8	62.1	10	T-½	62	22	22	21
20.2	63.4	10.5	U-½	63	24	23.5	22
20.6	64.6	11	V-½	64	25	24.5	23
21	65.9	11.5	W-½	66	26	26	25
21.4	67.2	12	X-½	67	27	27.5	26
21.8	68.5	12.5	Z	68	28	28.5	28
22.2	69.7	13	Z+1	70	30	30	29
22.6	71	13.5	Z+1.5	71	31	31	30
23	72.3	14	Z+3	72	32	32.5	31
23.4	73.5	14.5	Z+4	73	33	33.5	32
23.8	74.8	15	Z+5	74	35	35	33

OTHER TIPS

1) *Measure your finger in warm temperatures at the end of the day.

2) *If your knuckle is a lot larger than the base of your finger, measure both the base of your finger and your knuckle and select a size between the two.

3) *When considering a wide band, move up a size from your measurement, for comfort’s sake.