US · UK · EU · mm

Ring Size Converter

Wrap a strip of paper around the base of your finger, mark where it overlaps, and measure that length in millimeters. Enter it here to get your size.

Measurement

Measured as

US	UK	EU	Diameter	Circumference

Ring size chart

US	UK	EU	Diameter (mm)	Circumference (mm)
3	F	44	14.1	44.2
3.5	G	45	14.5	45.5
4	H	47	14.9	46.8
4.5	I	48	15.3	48
5	J½	49	15.7	49.3
5.5	K½	51	16.1	50.6
6	L½	52	16.5	51.9
6.5	M½	53	16.9	53.1
7	N½	54	17.3	54.4
7.5	O½	56	17.7	55.7
8	P½	57	18.1	57
8.5	Q½	58	18.5	58.2
9	R½	60	18.9	59.5
9.5	S½	61	19.4	60.8
10	T½	62	19.8	62.1
10.5	U½	63	20.2	63.3
11	V½	65	20.6	64.6
11.5	W½	66	21	65.9
12	X½	67	21.4	67.2
12.5	Z	68	21.8	68.5
13	Z+1	70	22.2	69.7

1. Cut a thin strip of paper or use a piece of string.

2. Wrap it snugly around the base of the finger, at the end of the day when fingers are largest.

3. Mark where it overlaps and measure the length in millimeters. That's the circumference.

4. If your knuckle is wide, measure it too and use the larger size so the ring slides on.

Already own a ring that fits? Measure its inside diameter edge to edge and choose “Inside diameter”.

What is the most common ring size?

For women, US sizes 6 to 7; for men, US sizes 9 to 10.

How do EU ring sizes work?

An EU ring size is the inside circumference in millimeters, so EU 54 is a ring 54 mm around (about US 7).

Should a ring be snug or loose?

Snug enough not to slip off, loose enough to slide over the knuckle with a little resistance.