Conversion · Switzerland to Japan

Swiss to Japan / China ring sizes.

Swiss 14 = Japan / China 15 17.19 mm across · 54.0 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.

Swiss	Japan / China	Diameter	Circumference
0	outside range	12.73 mm	40.0 mm
1	1	13.05 mm	41.0 mm
2	2	13.37 mm	42.0 mm
3	3	13.69 mm	43.0 mm
4	4	14.01 mm	44.0 mm
5	6	14.32 mm	45.0 mm
6	7	14.64 mm	46.0 mm
7	8	14.96 mm	47.0 mm
8	9	15.28 mm	48.0 mm
9	10	15.60 mm	49.0 mm
10	11	15.92 mm	50.0 mm
11	12	16.23 mm	51.0 mm
12	13	16.55 mm	52.0 mm
13	14	16.87 mm	53.0 mm
14	15	17.19 mm	54.0 mm
15	16	17.51 mm	55.0 mm
16	18	17.83 mm	56.0 mm
17	19	18.14 mm	57.0 mm
18	20	18.46 mm	58.0 mm
19	21	18.78 mm	59.0 mm
20	22	19.10 mm	60.0 mm
21	23	19.42 mm	61.0 mm
22	24	19.74 mm	62.0 mm
23	25	20.05 mm	63.0 mm
24	26	20.37 mm	64.0 mm
25	27	20.69 mm	65.0 mm
26	outside range	21.01 mm	66.0 mm
27	outside range	21.33 mm	67.0 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 →