Size charts / Nike to On size conversion

Nike to On size conversion

Nike and On sizes side by side for the same US size, men's and women's. The EU and UK labels come from each brand's own size chart. They compare size labels and do not assess product fit.

Size charts: Nike · On

Men's

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Nike and On men's sizes by US size
US	Nike EU	On EU	Nike UK	On UK
7	40	40	6 (40)	6.5
7.5	40 1/2	40 1/2	6.5	7
8	41	41	7	7.5
8.5	42	42	7.5	8
9	42 1/2	42 1/2	8	8.5
9.5	43	43	8.5	9
10	44	44	9	9.5
10.5	44 1/2	44 1/2	9.5	10
11	45	45	10	10.5
11.5	45 1/2	46	10.5	11
12	46	47	11	11.5
12.5	47	47 1/2	11.5	12
13	47 1/2	48	12	12.5
14	48 1/2	49	13	13.5

Women's

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Nike and On women's sizes by US size
US	Nike EU	On EU	Nike UK	On UK
5	35 1/2	36	2.5	3
5.5	36	36 1/2	3	3.5
6	36 1/2	37	3.5	4
6.5	37 1/2	37 1/2	4	4.5
7	38	38	4.5	5
7.5	38 1/2	38 1/2	5	5.5
8	39	39	5.5	6
8.5	40	40	6	6.5
9	40 1/2	40 1/2	6.5	7
9.5	41	41	7	7.5
10	42	42	7.5	8
10.5	42 1/2	42 1/2	8	8.5
11	43	43	8.5	9

Questions

Is a Nike EU size the same as a On EU size?: Not always. For 5 of 14 shared US men's sizes, the EU label differs. For example, US 11.5 is EU 45 1/2 at Nike and EU 46 at On.
What is a Nike US 11.5 in On?: At On, US 11.5 men's is EU 46 and UK 11. At Nike, it is EU 45 1/2 and UK 10.5.
Which sizes does the table cover?: Men's: US 7 to US 14 (14 sizes). Women's: US 5 to US 11 (13 sizes). The table shows only the US sizes that both charts list.
Does this table tell me how a shoe fits?: No. It compares the size labels of the Nike and On charts. Fit depends on the model; check the maker's guide for the model you want.