Reference chart

International Ring Size Chart

Compare diameter, circumference and equivalent India, US, UK and EU ring sizes in one chart.

Worldwide ring size conversion chart
Diameter	Circumference	India	US	UK	EU
13.0 mm	40.8 mm	1	1.5	D	41
13.4 mm	42.1 mm	2	2	E	42
13.7 mm	43.0 mm	3	2.5	F	43
14.0 mm	44.0 mm	4	3	F 1/2	44
14.3 mm	44.9 mm	5	3.25	G	45
14.6 mm	45.8 mm	6	3.75	H	46
14.9 mm	46.8 mm	7	4	H 1/2	47
15.3 mm	48.1 mm	8	4.5	I 1/2	48
15.6 mm	49.0 mm	9	5	J 1/2	49
15.9 mm	50.0 mm	10	5.25	K	50
16.2 mm	50.9 mm	11	5.75	L	51
16.5 mm	51.9 mm	12	6	L 1/2	52
16.8 mm	52.8 mm	13	6.5	M 1/2	53
17.2 mm	54.0 mm	14	7	N	54
17.5 mm	55.0 mm	15	7.25	O	55
17.8 mm	56.0 mm	16	7.5	P	56
18.1 mm	56.9 mm	17	8	P 1/2	57
18.5 mm	58.1 mm	18	8.5	Q 1/2	58
18.8 mm	59.1 mm	19	8.75	R	59
19.1 mm	60.0 mm	20	9	S	60
19.4 mm	60.9 mm	21	9.5	S 1/2	61
19.7 mm	61.9 mm	22	10	T 1/2	62
20.1 mm	63.1 mm	23	10.5	U 1/2	63
20.4 mm	64.1 mm	24	10.75	V	64
20.7 mm	65.0 mm	25	11	W	65
21.0 mm	66.0 mm	26	11.5	W 1/2	66
21.3 mm	66.9 mm	27	12	X 1/2	67
21.6 mm	67.9 mm	28	12.25	Y	68
22.0 mm	69.1 mm	29	12.75	Z	69
22.3 mm	70.1 mm	30	13	Z + 1	70

How to Read the Ring Size Chart

Start with the measurement column you know, then keep reading across that same row. Diameter and circumference sit first so you can compare a physical measurement before comparing India, US, UK and EU labels.

Ring Diameter and Circumference Explained

Diameter measures across a ring’s inner edge. Circumference is the marked length around a finger or ring. Use one measurement to choose a row; do not combine values from separate rows.

International Ring Size Standards

India, US, UK and EU systems use different labels. This chart makes the app’s cross-system rows visible, while leaving room for a retailer’s own sizing chart or fit guidance to differ slightly.

Need to Measure First?

Use a ring that fits, a paper strip, or enter a known measurement in the calculator.

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