Conversion · Europe to Switzerland

EU / ISO 8653 to Swiss ring sizes.

EU / ISO 8653 56 = Swiss 16 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	Swiss	Diameter	Circumference
44	4	14.01 mm	44.0 mm
45	5	14.32 mm	45.0 mm
46	6	14.64 mm	46.0 mm
47	7	14.96 mm	47.0 mm
48	8	15.28 mm	48.0 mm
49	9	15.60 mm	49.0 mm
50	10	15.92 mm	50.0 mm
51	11	16.23 mm	51.0 mm
52	12	16.55 mm	52.0 mm
53	13	16.87 mm	53.0 mm
54	14	17.19 mm	54.0 mm
55	15	17.51 mm	55.0 mm
56	16	17.83 mm	56.0 mm
57	17	18.14 mm	57.0 mm
58	18	18.46 mm	58.0 mm
59	19	18.78 mm	59.0 mm
60	20	19.10 mm	60.0 mm
61	21	19.42 mm	61.0 mm
62	22	19.74 mm	62.0 mm
63	23	20.05 mm	63.0 mm
64	24	20.37 mm	64.0 mm
65	25	20.69 mm	65.0 mm
66	26	21.01 mm	66.0 mm
67	27	21.33 mm	67.0 mm
68	outside range	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 →