Ring Size Guide

Use the chart below for conversion of US and Canadian number sizes to the "Wheat sheaf" system of letter sizes used in Ireland, U.K. Australia, ect. Diameters and circumferences are also given in both inches and millimeters. Please note that these measurements are exact for the American system and approximate for the other sizing scales, since the intervals in each system do not correspond exactly.

Ring sizing gauges and finger gauges as well as published charts do not always agree. Add to this that there are two conflicting methods of reading ring gauges so it is quite common for ring sizes to vary slightly from one workshop or jeweler to another. The ring sizing information presented here is the result of a conscientious study and comparison of various sources and is consistent with the instruments and measuring technique that we use in our workshop.

Inside	Inside	Inside	Inside	Number Sizes	Wheat Sheaf
Diameter	Diameter	Circumference	Circumference	US/Canada	British	Japanese	Swiss
(inches)	(mm)	(inches)	(mm)	Standard	Irish	Equivalent	Equivalent
					Australian
					Equivalent
0.458	11.6	1.438	36.5	0
0.466	11.8	1.463	37.2	1/4
0.474	12.0	1.488	37.8	1/2	A
0.482	12.2	1.513	38.4	3/4	A 1/2
0.490	12.4	1.539	39.1	1	B	1
0.498	12.6	1.564	39.7	1 1/4	B 1/2
0.506	12.9	1.589	40.4	1 1/2	C
0.514	13.1	1.614	41.0	1 3/4	C 1/2
0.522	13.3	1.639	41.6	2	D	2	1.50
0.530	13.5	1.664	42.3	2 1/4	D 1/2
0.538	13.7	1.689	42.9	2 1/2	E	3	2.75
0.546	13.9	1.714	43.5	2 3/4	E 1/2
0.554	14.1	1.740	44.2	3	F	4	4.00
0.562	14.3	1.765	44.8	3 1/4	F 1/2	5	5.25
0.570	14.5	1.790	45.5	3 1/2	G
0.578	14.7	1.815	46.1	3 3/4	G 1/2	6	6.50
0.586	14.9	1.840	46.7	4	H	7
0.594	15.1	1.865	47.4	4 1/4	H 1/2		7.75
0.602	15.3	1.890	48.0	4 1/2	I	8
0.610	15.5	1.915	48.7	4 3/4	J		9.00
0.618	15.7	1.941	49.3	5	J 1/2	9
0.626	15.9	1.966	49.9	5 1/4	K		10.00
0.634	16.1	1.991	50.6	5 1/2	K 1/2	10
0.642	16.3	2.016	51.2	5 3/4	L		11.75
0.650	16.5	2.041	51.8	6	L 1/2	11	12.75
0.658	16.7	2.066	52.5	6 1/4	M	12
0.666	16.9	2.091	53.1	6 1/2	M 1/2	13	14.00
0.674	17.1	2.116	53.8	6 3/4	N
0.682	17.3	2.141	54.4	7	N 1/2	14	15.25
0.690	17.5	2.167	55.0	7 1/4	O
0.698	17.7	2.192	55.7	7 1/2	O 1/2	15	16.50
0.706	17.9	2.217	56.3	7 3/4	P
0.714	18.1	2.242	56.9	8	P 1/2	16	17.75
0.722	18.3	2.267	57.6	8 1/4	Q
0.730	18.5	2.292	58.2	8 1/2	Q 1/2	17
0.738	18.7	2.317	58.9	8 3/4	R		19
0.746	18.9	2.342	59.5	9	R 1/2	18
0.754	19.2	2.368	60.1	9 1/4	S		20.25
0.762	19.4	2.393	60.8	9 1/2	S 1/2	19
0.770	19.6	2.418	61.4	9 3/4	T		21.5
0.778	19.8	2.443	62.1	10	T 1/2	20
0.786	20.0	2.468	62.7	10 1/4	U	21
0.794	20.2	2.493	63.3	10 1/2	U 1/2	22	22.75
0.802	20.4	2.518	64.0	10 3/4	V
0.810	20.6	2.543	64.6	11	V 1/2	23
0.818	20.8	2.569	65.2	11 1/4	W		25
0.826	21.0	2.594	65.9	11 1/2	W 1/2	24
0.834	21.2	2.619	66.5	11 3/4	X
0.842	21.4	2.644	67.2	12	X 1/2	25	27.50
0.850	21.6	2.669	67.8	12 1/4	Y
0.858	21.8	2.694	68.4	12 1/2	Z	26	28.75
0.866	22.0	2.719	69.1	12 3/4	Z 1/2
0.874	22.2	2.744	69.7	13		27
0.882	22.4	2.769	70.3	13 1/4	Z1
0.890	22.6	2.795	71.0	13 1/2
0.898	22.8	2.820	71.6	13 3/4	Z2
0.906	23.0	2.845	72.3	14	Z3
0.914	23.2	2.870	72.9	14 1/4
0.922	23.4	2.895	73.5	14 1/2	Z4
0.930	23.6	2.920	74.2	14 3/4
0.938	23.8	2.945	74.8	15
0.946	24.0	2.970	75.4	15 1/4
0.954	24.2	2.996	76.1	15 1/2
0.962	24.4	3.021	76.7	15 3/4