Question 1

how do i measure my ring size at home?

Accepted Answer

two reliable ways. one: measure a ring that already fits, and its inside diameter in mm maps straight to a size in the chart. two: wrap a strip of paper or floss around the base of the finger, mark where it overlaps, and measure the length in mm; that's the inside circumference. enter either into the converter to get the size. measure at the end of the day when fingers are largest.

Question 2

how do i convert a US ring size to UK?

Accepted Answer

US sizes are numeric and UK sizes are letters, so there's no formula, just a lookup. a US 6 is a UK L½, a US 7 is a UK N½, and a US 8 is a UK P½. pick 'US' in the converter, choose your size, and it shows the UK letter instantly, along with EU and Japan.

Question 3

what is my ring size in mm?

Accepted Answer

ring size in mm usually means the inside diameter (across the opening) or the inside circumference (all the way around). the EU/ISO size is simply the circumference in mm. a US 7, for example, is about 17.3 mm in diameter and 54 mm around, an EU/ISO 54.

Question 4

is ring sizing the same everywhere?

Accepted Answer

no. the US and Canada use numbers, the UK and Australia use letters, the EU and ISO use the circumference in mm, and Japan uses its own number scale. the physical ring is identical, only the label changes. that's exactly what this converter translates.

Question 5

what if i'm between two sizes?

Accepted Answer

size up. a slightly loose ring is easier to get on and off and more comfortable through the day, and a jeweler can size it down more easily than up. if the ring has a wide band, go up a further half size, since wide bands fit tighter.

Question 6

how much does finger size change during the day?

Accepted Answer

enough to matter, up to about half a size. fingers are smallest in the cold morning and largest when warm at the end of the day or after exercise. measure a couple of times across different moments and average them before committing to a size.

US / Canada	UK / AU	EU / ISO	Japan	diameter	circumference
3	F	44	4	14.1 mm	44.3 mm
3.5	G½	46	5	14.5 mm	45.6 mm
4	H½	47	7	14.9 mm	46.8 mm
4.5	I½	48	8	15.3 mm	48.1 mm
5	J½	49	9	15.7 mm	49.3 mm
5.5	K½	51	10	16.1 mm	50.6 mm
6	L½	52	11	16.5 mm	51.8 mm
6.5	M½	53	13	16.9 mm	53.1 mm
7	N½	54	14	17.3 mm	54.3 mm
7.5	O½	56	15	17.7 mm	55.6 mm
8	P½	57	16	18.1 mm	56.9 mm
8.5	Q½	58	17	18.5 mm	58.1 mm
9	R½	60	18	19.0 mm	59.7 mm
9.5	S½	61	19	19.4 mm	60.9 mm
10	T½	62	20	19.8 mm	62.2 mm
10.5	U½	63	22	20.2 mm	63.5 mm
11	V½	65	23	20.6 mm	64.7 mm
11.5	W½	66	24	21.0 mm	66.0 mm
12	Y	67	25	21.4 mm	67.2 mm
12.5	Z	68	26	21.8 mm	68.5 mm
13	Z+1	70	27	22.2 mm	69.7 mm

ring size converter.

how to measure a ring size without a sizer.

measure a ring that fits.

wrap the finger.

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