Ring Sizing Guide

International Ring Size Chart

One finger, many numbers: every country sizes rings differently. Match your measurement across the USA/Canada, UK, France, Germany, Japan and Switzerland — with the Indian chart alongside and a simple way to measure at home.

Wrap

Wrap a thin strip of paper or a length of thread snugly around the base of the finger, just below the knuckle.

Mark & measure

Mark the point where it overlaps, lay it flat and measure the length in millimetres — that is the circumference.

Match

Find the closest circumference in the Indian chart, or the matching diameter in the international chart. Between two sizes, choose the larger for comfort.

International size comparison

Find your inner ring diameter in the first column, then read across for the equivalent in each national system. Cross-standard equivalents are the trade's published approximations — a dash means that system defines no matching size.

Ring Diameter (MM)	USA / Canada	United Kingdom	France	Germany	Japan	Switzerland
14.1	3	F	44	14	4	4
14.5	3.5	G	45.25	14.5	5	5.25
14.9	4	H	46.5	15	7	6.5
15.3	4.5	I	47.75	15.25	8	7.75
15.7	5	J½	49	15.75	9	9
16.1	5.5	K½	50	16	10	10
16.5	6	L½	51.5	16.5	12	11.5
16.9	6.5	M½	52.75	17	13	12.75
17.3	7	N½	54	17.25	14	14
17.7	7.5	O½	55.25	17.75	15	15.25
18.1	8	P½	56.5	18	16	16.5
18.5	8.5	Q½	58	18.5	17	18
19.0	9	R½	59.25	19	18	19.25
19.4	9.5	S½	60.5	19.5	19	20.5
19.8	10	T½	61.75	19.75	20	21.75
20.2	10.5	U½	63	20.25	22	23
20.6	11	V½	64.25	20.75	23	24.25
21.0	11.5	W½	65.5	21	24	25.5
21.4	12	X½	66.75	21.25	25	26.75
21.8	12.5	Z	68	21.75	26	28
22.2	13	—	69.25	22	27	29.25

France and Switzerland size by circumference (French size ≈ circumference in mm; Swiss ≈ circumference − 40); Germany sizes by diameter; the USA, UK and Japan each use their own scales — which is why equivalents can only ever be approximate.

Indian ring size chart

Indian sizes share the Japanese numerical scale. Inches and MM are the finger circumference — exactly what the paper-strip measurement gives you.

Indian Ring Size	Inches	MM	Diameter (MM)
1	1.61	40.8	13.0
2	1.65	41.9	13.3
3	1.69	42.9	13.7
4	1.73	44.0	14.0
5	1.77	45.0	14.3
6	1.81	46.1	14.7
7	1.86	47.1	15.0
8	1.90	48.2	15.3
9	1.94	49.2	15.7
10	1.98	50.3	16.0
11	2.02	51.3	16.3
12	2.06	52.4	16.7
13	2.10	53.4	17.0
14	2.14	54.5	17.3
15	2.19	55.5	17.7
16	2.23	56.5	18.0
17	2.27	57.6	18.3
18	2.31	58.6	18.7
19	2.35	59.7	19.0
20	2.39	60.7	19.3
21	2.43	61.8	19.7
22	2.47	62.8	20.0
23	2.51	63.9	20.3
24	2.56	64.9	20.7
25	2.60	66.0	21.0
26	2.64	67.0	21.3
27	2.68	68.1	21.7
28	2.72	69.1	22.0
29	2.76	70.2	22.3
30	2.80	71.2	22.7
31	2.84	72.3	23.0
32	2.89	73.3	23.3

Sizing tips

Measure in the evening

Fingers are slightly larger at the end of the day and in warm weather. An evening, room-temperature measurement — taken two or three times — gives the most reliable reading.

Mind the knuckle

If the knuckle is noticeably wider than the finger base, measure both and choose a size between the two, so the ring passes the knuckle but does not spin.

Wide bands run snug

A broad band grips more skin than a slim one. For bands wider than about 6 mm, consider going up half a size from your measured fit.

A ring you own is the best guide

Measure the inner diameter of a well-fitting ring across its widest point and read the size straight off the diameter column — no finger measurement needed.

Conversions are approximate

The national systems do not align perfectly, so cross-standard equivalents are rounded to the nearest listed size. For a set ring or an heirloom resize, a jeweller’s physical measurement is definitive.

Unsure between two sizes?

Choose the larger. A slightly loose ring can be resized or fitted with a sizing bead far more easily than a tight one can be stretched.