Ring size chart.

Compare US, UK, EU and Japanese ring sizes with the exact inside diameter and circumference in millimeters. Don't know your number yet? Use our free interactive ring sizer to measure a ring right on your screen.

International ring size conversion chart

US	UK	EU	JP	Inside Ø mm	Circumference mm
3	F	44	4	14.1	44.2
3.5	G	45	5	14.5	45.5
4	H	47	7	14.9	46.8
4.5	I	48	8	15.3	48.0
5	J½	49	9	15.7	49.3
5.5	K½	51	10	16.1	50.6
6	L½	52	12	16.5	51.9
6.5	M½	53	13	16.9	53.1
7	N½	54	14	17.3	54.4
7.5	O½	56	15	17.7	55.7
8	P½	57	16	18.1	57.0
8.5	Q½	58	17	18.5	58.2
9	R½	60	18	18.9	59.5
9.5	S½	61	19	19.4	60.8
10	T½	62	20	19.8	62.1
10.5	U½	63	22	20.2	63.3
11	V½	65	23	20.6	64.6
11.5	W½	66	24	21.0	65.9
12	Y	67	25	21.4	67.2
12.5	Z	68	26	21.8	68.5
13	Z+1	70	27	22.2	69.7

Women's ring size chart

Most women wear US 5 to 8; US 6 is the most common.

US	UK	EU	Ø mm
3	F	44	14.1
3.5	G	45	14.5
4	H	47	14.9
4.5	I	48	15.3
5	J½	49	15.7
5.5	K½	51	16.1
6	L½	52	16.5
6.5	M½	53	16.9
7	N½	54	17.3
7.5	O½	56	17.7
8	P½	57	18.1
8.5	Q½	58	18.5
9	R½	60	18.9

Men's ring size chart

Most men wear US 8 to 12; US 10 is the most common.

US	UK	EU	Ø mm
8	P½	57	18.1
8.5	Q½	58	18.5
9	R½	60	18.9
9.5	S½	61	19.4
10	T½	62	19.8
10.5	U½	63	20.2
11	V½	65	20.6
11.5	W½	66	21.0
12	Y	67	21.4
12.5	Z	68	21.8
13	Z+1	70	22.2

How to read this ring size chart

US and Canada use numbers in half sizes.
UK and Australia use letters.
EU sizes equal the inside circumference in millimeters, rounded.
Japanese sizes use their own number scale.
If you're between two sizes, choose the larger one, especially for wide bands.