Size Guide

About ring sizes

Lalalu's ring size notation is the standard in Japan. We use the JCS (Japan Custom Size) standard.

Sizes vary depending on the product, so please check the size listed on the product page.

Please refer to the table below for how to measure the size.

size	Inner circumference (mm)	Inner diameter (mm)
No. 1	40.8	13
No. 2	41.9	13.4
No. 3	42.9	13.7
No. 4	44	14
No. 5	45	14.4
No. 6	46.1	14.7
No. 7	47.1	15
No. 8	48.2	15.4
No. 9	49.2	15.7
No. 10	50.5	16
No. 11	51.3	16.4
No. 12	52.4	16.7
No. 13	53.4	17
No. 14	54.5	17.4
No. 15	55.5	17.7
No. 16	56.6	18
No. 17	57.6	18.4
No. 18	58.6	18.7
No. 19	59.7	19
No. 20	60.7	19.4
No. 21	61.8	19.7
No. 22	62.8	20
No. 23	63.9	20.4
No. 24	64.9	20.7
No. 25	66	twenty one
No. 26	67	21.4
No. 27	68	21.7
No. 28	69	twenty two