Conversion · Europe to United States

EU / ISO 8653 to US / Canada ring sizes.

EU / ISO 8653 56 = US / Canada 7½ 17.83 mm across · 56.0 mm around

Both scales describe the same physical ring. The table below converts every size in the range, derived from inner circumference rather than copied.

EU / ISO 8653	US / Canada	Diameter	Circumference
44	3	14.01 mm	44.0 mm
45	3½	14.32 mm	45.0 mm
46	3½	14.64 mm	46.0 mm
47	4	14.96 mm	47.0 mm
48	4½	15.28 mm	48.0 mm
49	5	15.60 mm	49.0 mm
50	5½	15.92 mm	50.0 mm
51	5½	16.23 mm	51.0 mm
52	6	16.55 mm	52.0 mm
53	6½	16.87 mm	53.0 mm
54	7	17.19 mm	54.0 mm
55	7½	17.51 mm	55.0 mm
56	7½	17.83 mm	56.0 mm
57	8	18.14 mm	57.0 mm
58	8½	18.46 mm	58.0 mm
59	9	18.78 mm	59.0 mm
60	9	19.10 mm	60.0 mm
61	9½	19.42 mm	61.0 mm
62	10	19.74 mm	62.0 mm
63	10½	20.05 mm	63.0 mm
64	11	20.37 mm	64.0 mm
65	11	20.69 mm	65.0 mm
66	11½	21.01 mm	66.0 mm
67	12	21.33 mm	67.0 mm
68	12½	21.65 mm	68.0 mm

Measure in the evening — fingers swell through the day and in heat — and let your jeweller's own chart take precedence over this one. How to measure at home →