Sturgis-Rally Virtual Mall, Ringchoice

Ring Sizes

Ring sizes are measured in different ways in the USA compared to Britian and Europe. The table below compares European and British standards with the US standard.
Sturgis-Rally.com uses the US standard for ring sizes. If you are familiar with another standard, please see the table below to find the US equivalent before placing your order.

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British Standard	European Size	American Size	Inside Diameter
British Standard	European Size	American Size	Inches	mm
	49	5	0.6141	15.597
J			0.6145	15.6 08
J½			0.6223	15.806
	50		0.6266	15. 916
K		5½	0.6300	16.002
K½			0.6378	16.200
	51		0.6391	16. 234
L		6	0.6455	16.396
	52		0.6517	16. 552
L½			0.6533	16.594
M			0.6610	16.7 89
		6½	0.6620	16.815
	53		0.6642	16. 871
M½			0.6688	16.988
N			0.6765	17.1 83
	54		0.6767	17. 189
		7	0.6780	17.2 21
N½			0.6843	17.381
	55		0.6893	17. 507
O			0.6920	17.5 77
		7½	0.6940	17.628
O½			0.6998	17.775
	56		0.7018	17. 826
P			0.7075	17.9 71
		8	0.7100	18.0 34
	57		0.7143	18. 144
P½			0.7153	18.169
Q			0.7230	18.3 64
		8½	0.7265	18.453
	58		0.7269	18. 462
Q½			0.7308	18.562
R			0.7385	18.7 58
	59		0.7394	18. 780
		9	0.7430	18.8 72
R½			0.7463	18.956
	60		0.7519	19. 098
S			0.7540	19.1 52
		9½	0.7590	19.279
S½			0.7618	19.350
	61		0.7644	19. 416
T			0.7695	19.5 45
	62		0.7770	19. 736
T½			0.7772	19.741
		10	0.7780	19. 761
U			0.7850	19.9 39
	63		0.7895	20. 054
U½			0.7928	20.137
		10½	0.7940	20.168
V			0.8005	20.3 33
	64		0.8020	20. 372
V½			0.8083	20.531
		11	0.8110	20. 599
	65		0.8146	20. 690
W			0.8160	20.7 26
W½			0.8238	20.925
	66	11½	0.8271	21.008
X			0.8315	21.1 20
X½			0.8393	21.318
	67		0.8396	21. 326
		12	0.8430	21. 412
Y			0.8470	21.5 14
	68		0.8522	21. 645
Y½			0.8548	21.712
		12½	0.8590	21.819
Z			0.8625	21.9 08
	69		0.8647	21. 963
Z½			0.8703	22.106
		13	0.8750	22. 225
British Standard	European Size	American Size	Inside Diameter
British Standard	European Size	American Size	Inches	mm

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