Ring Size Guide

Ring Size Guide

Find your US ring size below. The UK letter size is shown alongside it, because our size labels list both.

US Size	UK Letter Size	Inner Diameter (mm)	Inner Diameter (in)	Inside Circumference (mm)
3	F	14.01	0.55"	44mm
3 1/2	G	14.33	0.56"	45mm
3 3/4	G 1/2	14.64	0.58"	46mm
4 1/4	H 1/2	14.96	0.59"	47mm
4 1/2	I 1/2	15.28	0.60"	48mm
5	J	15.60	0.61"	49mm
5 1/4	K	15.92	0.63"	50mm
5 1/2	K 1/2	16.24	0.64"	51mm
6	L 1/2	16.56	0.65"	52mm
6 1/2	M 1/2	16.88	0.66"	53mm
7	N	17.19	0.68"	54mm
7 1/4	O	17.51	0.69"	55mm
7 3/4	P	17.83	0.70"	56mm
8	P 1/2	18.15	0.71"	57mm
8 1/2	Q 1/2	18.47	0.73"	58mm
8 3/4	R	18.78	0.74"	59mm
9 1/4	S	19.10	0.75"	60mm
9 3/4	T	19.42	0.76"	61mm
10	T 1/2	19.74	0.78"	62mm
10 1/2	U	20.06	0.79"	63mm
10 3/4	U 1/2	20.38	0.80"	64mm
11 1/4	W	20.70	0.81"	65mm
11 1/2	X	21.01	0.83"	66mm
12	X 1/2	21.33	0.84"	67mm
12 1/2	Y 1/2	21.65	0.85"	68mm
12 3/4	Z	21.97	0.86"	69mm
13 1/4	Z + 1	22.29	0.88"	70mm
13 1/2	Z + 2	22.61	0.89"	71mm
13 3/4	Z + 3	22.93	0.90"	72mm
14 1/2	Z + 3 1/2	23.24	0.91"	73mm
15	Z + 4	23.56	0.93"	74mm
15 1/2	Z + 5	23.88	0.94"	75mm
15 1/2	Z + 6	24.20	0.95"	76mm

The most common sizes are 11 and 13, which fit most men. If you are between sizes, go one size up. A ring that sits slightly loose is easier to wear than one that is too tight, and you can wrap a little tape around the band for a snugger fit.

Rings with thicker bands, such as the 5 row keeper ring, fit tighter, so we recommend going one size up.

Not sure of your size? Measure the inside diameter of a ring you already wear and match it to the chart above, or email help@au-jewellers.com with a photo and we will help.