Ring Size Conversion Chart

All Eternate rings on the site are specified in standard US sizes. If you have measured your finger circumference or already know your size, you can use our conversion chart below to compare US sizes to millimeters, inches or standard sizes of other countries.

Inside Circumference		Inside Diameter	US & Canada	Europe	UK & Australia	Japan & Singapore
IN	MM	MM	US & Canada	Europe	UK & Australia	Japan & Singapore
1.74	44.3	14.1	3	44	F 1/2	4
1.77	44.9	14.3	3.25	45	G	5
1.79	45.6	14.5	3.5		G 1/2
1.82	46.2	14.7	3.75	46	H	6
1.84	46.8	14.9	4	47	H 1/2	7
1.87	47.4	15.1	4.25		I
1.89	48.1	15.3	4.5	48	I 1/2	8
1.92	48.7	15.5	4.75		J
1.94	49.3	15.7	5	49	J 1/2	9
1.97	50.0	15.9	5.25	50	K
1.99	50.6	16.1	5.5		K 1/2	10
2.02	51.2	16.3	5.75	51	L
2.04	51.8	16.5	6	52	L 1/2	11
2.07	52.5	16.7	6.25		M	12
2.09	53.1	16.9	6.5	53	M 1/2	13
2.12	53.7	17.1	6.75		N
2.14	54.3	17.3	7	54	N 1/2	14
2.16	55.0	17.5	7.25	55	O
2.19	55.6	17.7	7.5		O 1/2	15
2.21	56.2	17.9	7.75	56	P
2.24	56.9	18.1	8	57	P 1/2	16
2.26	57.5	18.3	8.25		Q
2.29	58.1	18.5	8.5	58	Q 1/2	17
2.33	59.1	18.8	8.75	59	R
2.35	59.7	19	9		R 1/2	18
2.37	60.3	19.2	9.25	60	S
2.40	60.9	19.4	9.5	61	S 1/2	19
2.42	61.6	19.6	9.75		T
2.45	62.2	19.8	10	62	T 1/2	20
2.47	62.8	20	10.25		U	21
2.50	63.5	20.2	10.5	63	U 1/2	22
2.52	64.1	20.4	10.75	64	V
2.55	64.7	20.6	11		V 1/2	23
2.57	65.3	20.8	11.25	65	W
2.60	66.0	21	11.5	66	W 1/2	24
2.62	66.6	21.2	11.75		X
2.65	67.2	21.4	12	67	X 1/2	25
2.67	67.9	21.6	12.25		Y
2.70	68.5	21.8	12.5	68	Z	26
2.72	69.1	22	12.75	69	Z 1/2
2.75	69.7	22.2	13	70		27
2.77	70.4	22.4	13.25		Z+1
2.80	71.0	22.6	13.5		Z+2

Planning a surprise?

We have come up with some sneaky ways to learn their ring size.

Don’t know how to measure your ring size?

Our step-by-step guide with pictures is here for you to learn how to take a measurement of your ring size as accurately as possible.

Already have a nice fitting ring? Use our ring size guide.

Just download and print our guide and find a ring that you wear comfortably on the same finger that you are buying your new Eternate ring for. Place the ring on the chart to find the right size.

Get your customized home try-on kit.

We will send you replicas of the five designs you like most, made identical in size, width and color so you can see exactly how they will look on your fingers. A complementary ring sizer will be included to help you find the perfect fit.

Eternate’s Ring Size Tips

A perfectly fit ring should not come off easily when you ease it on your finger, it should rather slide smoothly. This is important both for your comfort and to minimize the risk of loss.
Size of your fingers will change with temperature and throughout the day. They expand in warm weather and shrink in cold. So don’t measure your fingers when you are cold, they are the smallest at this time. Measure your finger at the very end of day in a warm temperate when it is the largest for a more accurate reading.
Measure your ring size more than once before your purchase.
Your left hand and right hand are not the same size. So make sure to measure the finger you plan to wear the ring on.
If your knuckles are larger, take two measurements: one around the knuckle and one where the ring would go. Then choose a size in between. Your ring needs to fit over the knuckle but not be too loose on the finger.
Consider the width of the ring you are planning to purchase. If it is wide, go for a 0.5 larger size.
If you are hovering between two sizes, pick the larger one.