Conversion · India to Japan

Indian to Japan / China ring sizes.

Indian 16 = Japan / China 17 17.54 mm across · 55.1 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.

Indian	Japan / China	Diameter	Circumference
1	2	13.30 mm	41.8 mm
2	3	13.58 mm	42.7 mm
3	4	13.87 mm	43.6 mm
4	5	14.15 mm	44.4 mm
5	6	14.43 mm	45.3 mm
6	7	14.71 mm	46.2 mm
7	8	15.00 mm	47.1 mm
8	9	15.28 mm	48.0 mm
9	10	15.56 mm	48.9 mm
10	11	15.84 mm	49.8 mm
11	12	16.13 mm	50.7 mm
12	13	16.41 mm	51.5 mm
13	14	16.69 mm	52.4 mm
14	15	16.97 mm	53.3 mm
15	16	17.26 mm	54.2 mm
16	17	17.54 mm	55.1 mm
17	18	17.82 mm	56.0 mm
18	19	18.10 mm	56.9 mm
19	19	18.39 mm	57.8 mm
20	20	18.67 mm	58.6 mm
21	21	18.95 mm	59.5 mm
22	22	19.23 mm	60.4 mm
23	23	19.52 mm	61.3 mm
24	24	19.80 mm	62.2 mm
25	25	20.08 mm	63.1 mm
26	26	20.36 mm	64.0 mm
27	27	20.65 mm	64.9 mm
28	outside range	20.93 mm	65.8 mm
29	outside range	21.21 mm	66.6 mm
30	outside range	21.49 mm	67.5 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 →