On shoe size chart

Men's, women's and kids' sizes, copied from On's own chart. Checked 25 Oct 2026.

How On sizing works

On doesn't publish one size guide. Each shoe has its own chart on its product page, so these numbers come from the Cloudrunner 3 Max.

Other On models may run a little differently or offer more sizes. Check the product page of the shoe you're buying.

On says its Japan size is in centimetres and suggests adding about 1 cm to your measured foot length.

Source: on.com

US Men	UK	EU	JP
7	6.5	40	25
7.5	7	40.5	25.5
8	7.5	41	26
8.5	8	42	26.5
9	8.5	42.5	27
9.5	9	43	27.5
10	9.5	44	28
10.5	10	44.5	28.5
11	10.5	45	29
11.5	11	46	29.5
12	11.5	47	30
12.5	12	47.5	30.5
13	12.5	48	31
13.5	13	48.5	31.5
14	13.5	49	32
15	14.5	50	33

Source: on.com

US Women	UK	EU	JP
5	3	36	22
5.5	3.5	36.5	22.5
6	4	37	23
6.5	4.5	37.5	23.5
7	5	38	24
7.5	5.5	38.5	24.5
8	6	39	25
8.5	6.5	40	25.5
9	7	40.5	26
9.5	7.5	41	26.5
10	8	42	27
10.5	8.5	42.5	27.5
11	9	43	28
12	10	44	29

Source: on.com

US Kids	UK	EU	JP	Inches
10.5	10	27.5	16.7	6.6
11	10.5	28.5	17.1	6.7
11.5	11	29	17.6	6.9
12	11.5	29.5	18	7.1
12.5	12	30	18.4	7.2
13	12.5	31	18.8	7.4
13.5	13	31.5	19.2	7.6
1	13.5	32	19.7	7.8
1.5	1	33	20.1	7.9
2	1.5	33.5	20.5	8.1
2.5	2	34	20.9	8.2
3	2.5	35	21.4	8.4

Source: on.com

US Kids	UK	EU	JP	Inches
3.5	3	35.5	21.6	8.5
4	3.5	36	22	8.7
4.5	4	36.5	22.4	8.8
5	4.5	37.5	22.9	9
5.5	5	38	23.3	9.2
6	5.5	38.5	23.7	9.3
6.5	6	39	24.1	9.5