Some Help in determining your Ring size.

Find a piece of string.
Wrap it around the approximate position on the finger where the ring will be. Make sure the string is taut.
Use a marker to mark where the string overlaps, forming a complete circle.
Measure the length from the starting end of the string to the pen mark using a ruler with a millimeter scale.
Check this measurement with the below chart to determine your ring size.

Ring Size	Circumference(mm)	Diameter(mm)
4.0	46.5	14.801
4.5	47.8	15.215
5.0	49.0	15.597
5.5	50.3	16.011
6.0	51.5	16.393
6.5	52.8	16.807
7.0	54.0	15.188
7.5	55.3	15.602
8.0	56.6	18.016
8.5	57.8	18.398
9.0	59.1	18.812
9.5	60.3	19.194
10.0	61.6	19.608
10.5	62.8	19.989
11.0	64.1	15.404
11.5	65.3	15.786
12.0	66.6	21.199
12.5	67.9	21.613
13.0	69.1	21.995

Below is a chart of international ring sizes for the convenience
of our international customers.

International Ring Size Chart
United States and Canada Ring Size	Diameter in Inches	Great Britain	France	Germany	Japan	Switzerland
000	0.390	---	---	---	---	---
00	0.422	---	---	---	---	---
0	0.454	---	---	---	---	---
½	0.462	A	---	---	---	---
¾	0.471	A-½	---	---	---	---
1	0.487	B	---	---	1	---
1 1/4	0.495	B-½	---	---	---	---
1 1/2	0.503	C	---	---	---	---
1 3/4	0.511	C-½	---	---	---	---
2	0.520	D	41 1/2	13 1/4	2	1 1/2
2 1/4	0.528	D-½	42 1/8	13 1/2	---	---
2 1/2	0.536	E	42 3/4	13 3/4	3	2 3/4
2 3/4	0.544	E-½	43 3/8	---	---	3 3/8
3	0.553	F	44	14	4	4
3 1/4	0.561	F-½	44 5/8	14 1/4	---	4 5/8
3 1/2	0.569	G	45 1/4	14 1/2	5	5 1/4
3 3/4	0.577	G-½	45 7/8	14 3/4	6	5 7/8
4	0.586	H-½	46 1/2	15	7	6 1/2
4 1/4	0.594	I	47 1/8	15 1/4	---	7 1/8
4 1/2	0.602	I-½	47 3/4	15 1/2	8	7 3/4
4 3/4	0.610	J	48 3/8	---	---	8 3/8
5	0.619	J-½	49	15 3/4	9	9
5 1/4	0.627	K	49 5/8	16	---	9 5/8
5 1/2	0.635	K-½	50 1/4	16 1/4	10	10 1/4
5 3/4	0.643	L	50 7/8	---	11	10 7/8
6	0.652	L-½	51 1/2	16 1/2	12	11 1/2
6 1/4	0.660	M	52 1/8	16 3/4	---	12 1/8
6 1/2	0.668	M-½	52 3/4	17	13	12 3/4
6 3/4	0.676	N	53 3/8	---	---	13 3/8
7	0.685	O	54	17 1/4	14	14
7 1/4	0.693	O-½	54 5/8	17 1/2	---	14 5/8
7 1/2	0.701	P	55 1/4	17 3/4	15	15 1/4
7 3/4	0.709	P-½	55 7/8	---	---	15 7/8
8	0.717	Q	56 1/2	18	16	16 1/2
8 1/4	0.726	Q-½	57 1/8	18 1/4	---	17 1/8
8 1/2	0.734	R	57 3/4	18 1/2	17	17 3/4
8 3/4	0.742	R-½	58 3/8	18 3/4	---	18 3/8
9	0.750	S	59	19	18	19
9 1/4	0.759	S-½	59 5/8	19 1/4	---	19 5/8
9 1/2	0.767	---	60 1/4	19 1/2	19	20 1/4
9 3/4	0.775	T	60 7/8	19 3/4	---	20 7/8
10	0.783	T-½	61 1/2	20	20	21 1/2
10 1/4	0.792	U	62 1/8	20 1/4	21	22 1/8
10 1/2	0.800	U-½	62 3/4	20 1/2	22	22 3/4
10 3/4	0.808	V	63 3/8	---	---	23 3/8
11	0.816	V-½	64	20 3/4	23	24
11 1/4	0.825	W	64 5/8	---	---	24 5/8
11 1/2	0.833	W-½	65 1/4	21	24	25 1/4
11 3/4	0.841	X	65 7/8	---	---	25 7/8
12	0.849	Y	66 1/2	21 1/4	25	26 1/2
12 1/4	0.858	Y-½	67 1/8	21 1/2	---	27 1/8
12 1/2	0.866	Z	67 3/4	21 3/4	26	27 3/4
12 3/4	0.874	Z-½	68 3/8	---	---	28 3/8
13	0.882	---	69	22	27	29