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Ring Size Converter

Use our free ring size converter to determine your ring size by circumference or diameter.

Please, follow the simple steps below to determine your ring size:

Choose your preferred sizing method
Move the slider until the selected object fits between the boxes (to help with proportions)
Click on the "Next" button and then move the slider until the inside diameter of the ring fits exactly between the boxes
Take a look at the fields below to see the results.

Online Ring Sizer | Ring Size Converter

Sizing Method:

SD Card Ruler Credit Card

Full-Size SD Card

Move the slider until the SD card (width:2.4cm) fits between the boxes
||

Credit Card

Move the slider until your credit card (width:8.56cm) fits between the boxes
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Ruler

Move the slider until 2cm on your ruler fits between the boxes
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Your Ring Size

Move the slider until the inside diameter of the ring fits exactly between the boxes
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Inside Diameter

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Inside Circumference

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Size

US & CA: ---

UK & AU: ---

Ring Size Conversion Chart

Inside Diameter		Inside Circumference		Sizes
inches	mm	inches	mm	US & Canada	UK & Australia
0.390	9.91	1.23	31.2	0000	-
0.422	10.72	1.33	33.7	00	-
0.458	11.63	1.44	36.5	0	-
0.466	11.84	1.46	37.2	1/4	-
0.474	12.04	1.49	37.8	1/2	A
0.482	12.24	1.51	38.5	3/4	A 1/2
0.49	12.45	1.54	39.1	1	B
0.498	12.65	1.56	39.7	1 1/4	B 1/2
0.506	12.85	1.59	40.4	1 1/2	C
0.514	13.06	1.61	41.0	1 3/4	C 1/2
0.522	13.26	1.64	41.7	2	D
0.53	13.46	1.67	42.3	2 1/4	D 1/2
0.538	13.67	1.69	42.9	2 1/2	E
0.546	13.87	1.72	43.6	2 3/4	E 1/2
0.554	14.07	1.74	44.2	3	F
0.562	14.27	1.77	44.8	3 1/4	F 1/2
0.57	14.48	1.79	45.5	3 1/2	G
0.578	14.68	1.82	46.1	3 3/4	G 1/2
0.586	14.88	1.84	46.8	4	H
0.594	15.09	1.87	47.4	4 1/4	H 1/2
0.602	15.29	1.89	48.0	4 1/2	I
0.61	15.49	1.92	48.7	4 3/4	J
0.618	15.7	1.94	49.3	5	J 1/2
0.626	15.9	1.97	50.0	5 1/4	K
0.634	16.1	1.99	50.6	5 1/2	K 1/2
0.642	16.31	2.02	51.2	5 3/4	L
0.65	16.51	2.04	51.9	6	L 1/2
0.658	16.71	2.07	52.5	6 1/4	M
0.666	16.92	2.09	53.1	6 1/2	M 1/2
0.674	17.12	2.12	53.8	6 3/4	N
0.682	17.32	2.14	54.4	7	N 1/2
0.69	17.53	2.17	55.1	7 1/4	O
0.698	17.73	2.19	55.7	7 1/2	O 1/2
0.706	17.93	2.22	56.3	7 3/4	P
0.714	18.14	2.24	57.0	8	P 1/2
0.722	18.34	2.27	57.6	8 1/4	Q
0.73	18.54	2.29	58.3	8 1/2	Q 1/2
0.738	18.75	2.32	58.9	8 3/4	R
0.746	18.95	2.34	59.5	9	R 1/2
0.754	19.15	2.37	60.2	9 1/4	S
0.762	19.35	2.39	60.8	9 1/2	S 1/2
0.77	19.56	2.42	61.4	9 3/4	T
0.778	19.76	2.44	62.1	10	T 1/2
0.786	19.96	2.47	62.7	10 1/4	U
0.794	20.17	2.49	63.4	10 1/2	U 1/2
0.802	20.37	2.52	64.0	10 3/4	V
0.81	20.57	2.54	64.6	11	V 1/2
0.818	20.78	2.57	65.3	11 1/4	W
0.826	20.98	2.59	65.9	11 1/2	W 1/2
0.834	21.18	2.62	66.6	11 3/4	X
0.842	21.39	2.65	67.2	12	X 1/2
0.85	21.59	2.67	67.8	12 1/4	Y
0.858	21.79	2.7	68.5	12 1/2	Z
0.866	22	2.72	69.1	12 3/4	Z 1/2
0.874	22.2	2.75	69.7	13
0.882	22.4	2.77	70.4	13 1/4	Z1
0.89	22.61	2.8	71.0	13 1/2
0.898	22.81	2.82	71.7	13 3/4	Z2
0.906	23.01	2.85	72.3	14	Z3
0.914	23.22	2.87	72.9	14 1/4	-
0.922	23.42	2.9	73.6	14 1/2	Z4
0.93	23.62	2.92	74.2	14 3/4	-
0.938	23.83	2.95	74.8	15	-
0.946	24.03	2.97	75.5	15 1/4	-
0.954	24.23	3	76.1	15 1/2	-
0.962	24.43	3.02	76.8	15 3/4	-
0.97	24.64	3.05	77.4	16	-

You may also like to try our Diamond Weight Calculator to determine the approximate weight of your diamond based on its dimensions.

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