International Ring Sizes

The following table aims to display UK ring sizes adjacent to their International equivalents and in relation to their diameter and circumference. When ordering a ring from Yellobox, please feel free to specify the size in any one of these sizing systems. If you would require an odd size (i.e. 3/4, 4/8), order the closest half or whole size and contact us by telephone or e-mail to state the correct size.

To find the approximated size of a ring, use our Ring Sizing Chart.

(Please note that the figures displayed in the diameter and circumference columns are in millimeters).

UK	US	Europe	Japan	Diameter	Circumference
I ½	4 ½	8.07	8	15.3	48.07
J	4 7/8	8.69	-	15.5	48.69
J ½	5	9.32	9	15.7	49.32
K	5 1/8	9.95	-	15.9	49.95
K ½	5 3/8	10.58	10	16.1	50.58
L	5 ¾	11.24	-	16.31	51.24
L ½	5 7/8	11.87	11	16.51	51.87
M	6	12.46	12	16.7	52.46
M ½	6 ¼	13.09	-	16.9	53.09
N	6 ½	13.72	13	17.1	53.72
N ½	6 ¾	14.35	-	17.3	54.35
O	7	14.98	14	17.5	54.98
O ½	7 ¼	15.61	-	17.7	55.61
P	7 ½	16.23	15	17.9	56.23
P ½	7 ¾	16.86	-	18.1	56.86
Q	8	17.49	16	18.3	57.49
Q ½	8 ¼	18.12	-	18.5	58.12
R	8 5/8	18.75	-	18.7	58.75
R ½	8 7/8	19.38	-	18.9	59.38
S	9 1/8	20	-	19.1	60
S ½	9 3/8	20.63	-	19.3	60.63
T	9 5/8	21.26	-	19.5	61.89
T ½	10	21.89	20	19.7	62.26
U	10 ¼	22.52	21	19.9	62.52
U ½	10 ½	23.15	22	20.1	63.15
V	10 ¾	23.77	-	20.3	63.77
V ½	11	24.4	23	20.5	64.4
W	11 1/8	25	-	20.69	65
W ½	11 3/8	25.66	-	20.9	65.66
X	11 5/8	26.29	-	21.1	66.29
X ½	11 7/8	26.92	-	21.3	66.92
Y	12	27.51	25	21.49	67.51
Y ½	12 ¼	28.2	-	21.71	68.2
Z	12 ½	28.77	26	21.89	68.77
Z ½	12 ¾	29.43	-	22.1	69.43
Z + 1	13	29.99	-	22.28	69.99

« Back