Rings Size Chart

Indian Standard	USA/Canada Standard	Diameter(mm)	Circumference(mm)
1	1.75	13.06	41
2	2	13.26	41.7
3	2.5	13.67	42.9
4	2.75	13.87	43.6
5	3.25	14.27	44.8
6	3.75	14.68	46.1
7	4.25	15.09	47.4
8	4.5	15.29	48
9	4.75	15.49	48.7
10	5.25	15.9	50
11	5.75	16.31	51.2
12	6	16.51	51.9
13	6.5	16.92	53.1
14	7	17.32	54.4
15	7.25	17.53	55.1
16	7.75	17.93	56.3
17	8	18.14	57
18	8.5	18.54	58.3
19	8.75	18.75	58.9
20	9.25	19.15	60.2
21	9.5	19.35	60.8
22	10	19.76	62.1
23	10.25	19.96	62.7
24	10.75	20.37	64
25	11	20.57	64.6
26	11.5	20.98	65.9
27	12	21.39	67.2
28	12.25	21.59	67.8
29	12.75	22	69.1
30	13	22.2	69.7
31	13.5	22.61	71
32	13.75	22.81	71.7
33	14.25	23.22	72.9
34	14.75	23.62	74.4
35	15	23.83	74.8
36	15.5	24.23	76.1
37	16	24.64	77.4