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Ring Size Conversion Chart
International Ring Sizes

All 25karats rings are manufactured in US standard ring size. Ring sizes vary by country. If you already know your ring size and just need to convert it to another scale, see our international ring size conversion chart below.

Inside Diameter (inches)	Inside Diameter (mm)	Inside Circumference (inches)	Inside Circumference (mm)	USA & Canada	British, Irish, Australian & New Zealand	European
0.458	11.6	1.438	36.5
0.466	11.8	1.463	37.2
0.474	12	1.488	37.8		A
0.482	12.2	1.513	38.4		A 1/2
0.49	12.4	1.539	39.1	1	B
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	1 3/4	C 1/2
0.522	13.3	1.639	41.6	2	D	1.5
0.53	13.5	1.664	42.3	2 1/4	D 1/2
0.538	13.7	1.689	42.9	2 1/2	E	2.75
0.546	13.9	1.714	43.5	2 3/4	E 1/2
0.554	14.1	1.74	44.2	3	F	4
0.562	14.3	1.765	44.8	3 1/4	F 1/2	5.25
0.57	14.5	1.79	45.5	3 1/2	G
0.578	14.7	1.815	46.1	3 3/4	G 1/2	6.5
0.586	14.9	1.84	46.7	4	H
0.594	15.1	1.865	47.4	4 1/4	H 1/2	7.75
0.602	15.3	1.89	48	4 1/2	I
0.61	15.5	1.915	48.7	4 3/4	J	9
0.618	15.7	1.941	49.3	5	J 1/2
0.626	15.9	1.966	49.9	5 1/4	K	10
0.634	16.1	1.991	50.6	5 1/2	K 1/2
0.642	16.3	2.016	51.2	5 3/4	L	11.75
0.65	16.5	2.041	51.8	6	L 1/2	12.75
0.658	16.7	2.066	52.5	6 1/4	M	12.75
0.666	16.9	2.091	53.1	6 1/2	M 1/2	14
0.674	17.1	2.116	53.8	6 3/4	N
0.682	17.3	2.141	54.4	7	N 1/2	15.25
0.69	17.5	2.167	55	7 1/4	O
0.698	17.7	2.192	55.7	7 1/2	O 1/2	16.5
0.706	17.9	2.217	56.3	7 3/4	P
0.714	18.1	2.242	56.9	8	P 1/2	17.75
0.722	18.3	2.267	57.6	8 1/4	Q
0.73	18.5	2.292	58.2	8 1/2	Q 1/2
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
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
0.77	19.6	2.418	61.4	9 3/4	T	21.5
0.778	19.8	2.443	62.1	10	T 1/2
0.786	20	2.468	62.7	10 1/4	U
0.794	20.2	2.493	63.3	10 1/2	U 1/2	22.75
0.802	20.4	2.518	64	10.3/4	V
0.81	20.6	2.543	64.6	11	V 1/2
0.818	20.8	2.569	65.2	11 1/4	W	25
0.826	21	2.594	65.9	11 1/2	W 1/2
0.834	21.2	2.619	66.5	11 3/4	X
0.842	21.4	2.644	67.2	12	X 1/2	27.5
0.85	21.6	2.669	67.8	12 1/4	Y
0.858	21.8	2.694	68.4	12 1/2	Z	28.75
0.866	22	2.719	69.1	12 3/4	Z 1/2
0.874	22.2	2.744	69.7	13
0.882	22.4	2.769	70.3	13 1/4	Z1
0.89	22.6	2.795	71	13 1/2
0.898	22.8	2.82	71.6	13 3/4	Z2
0.906	23	2.845	72.3	14	Z3
0.914	23.2	2.87	72.9	14 1/4
0.922	23.4	2.895	73.5	14 1/2	Z4
0.93	23.6	2.92	74.2	14 3/4
0.938	23.8	2.945	74.8	15
0.946	24	2.97	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
0.97	24.6	3.046	77.4	16

Disclaimer: We provide this chart to help our international customers to find their US equivalent ring size. Although we know from experience that this chart provides very accurate conversion results, we take no responsibility for any calculation errors.