ring size chart

Ring size chart (inner diameter, inner circumference, international standard)

A list of ring numbers (sizes), ring inner diameters, inner circumferences (finger circumferences), and international standards.




Japan (number)	Ring inner diameter (mm)	Inner Circumference / Finger circumference (mm)	International standard
No. 1	13.0	40.8	41
No. 2	13.3	41.9	42
No. 3	13.7	42.9	43
No. 4	14.0	44.0	44
No. 5	14.3	45.0	45
No. 6	14.7	46.1	46
No. 7	15.0	47.1	47
No. 8	15.3	48.1	48
No. 9	15.7	49.2	49
No. 10	16.0	50.3	50
No. 11	16.3	51.3	51
No. 12	16.7	52.4	52
No. 13	17.0	53.4	53
No. 14	17.3	54.5	54
No. 15	17.7	55.5	55
No. 16	18.0	56.6	56
No. 17	18.3	57.6	57
No. 18	18.7	58.6	58
No. 19	19.0	59.7	59
No. 20	19.3	60.7	60
No. 21	19.7	61.8	61
No. 22	20.0	62.8	62
No. 23	20.3	63.9	63
No. 24	20.7	64.9	64
No. 25	21.0	66.0	65
No. 26	21.3	67.0	66
No. 27	21.7	68.1	67
No. 28	22.0	69.1	68
No. 29	22.3	70.2	69
No. 30	22.7	71.2	70

・If you want to measure the exact size, please use a ring gauge.