Altra to Nike men's shoe size

The short answer

Altra 9.5 is Nike 9.5 by the two brands' own charts. 0 of 22 Altra sizes land on a different label at Nike.

At least one of the two brands publishes no foot length, so the rows line up the US size both charts print. Treat it as the label conversion, not a fit.

Every Altra size read across to Nike. US men's sizes on the left, US men's on the right.
Altra	Altra builds it for	Nike, by chart	Same label	Nike builds it for	Nike also prints
4	not published	4	not published	not published	US women's 5.5 · UK 3.5 · EU 36 · CM / JP 23
4.5	not published	4.5	not published	not published	US women's 6 · UK 4 · EU 36.5 · CM / JP 23.5
5	not published	5	not published	not published	US women's 6.5 · UK 4.5 · EU 37.5 · CM / JP 23.5
5.5	not published	5.5	not published	not published	US women's 7 · UK 5 · EU 38 · CM / JP 24
6	not published	6	not published	not published	US women's 7.5 · UK 5.5 · EU 38.5 · CM / JP 24
6.5	not published	6.5	not published	not published	US women's 8 · UK 6 · EU 39 · CM / JP 24.5
7	not published	7	not published	not published	US women's 8.5 · UK 6 · EU 40 · CM / JP 25
7.5	not published	7.5	not published	not published	US women's 9 · UK 6.5 · EU 40.5 · CM / JP 25.5
8	not published	8	not published	not published	US women's 9.5 · UK 7 · EU 41 · CM / JP 26
8.5	not published	8.5	not published	not published	US women's 10 · UK 7.5 · EU 42 · CM / JP 26.5
9	not published	9	not published	not published	US women's 10.5 · UK 8 · EU 42.5 · CM / JP 27
9.5	not published	9.5	not published	not published	US women's 11 · UK 8.5 · EU 43 · CM / JP 27.5
10	not published	10	not published	not published	US women's 11.5 · UK 9 · EU 44 · CM / JP 28
10.5	not published	10.5	not published	not published	US women's 12 · UK 9.5 · EU 44.5 · CM / JP 28.5
11	not published	11	not published	not published	US women's 12.5 · UK 10 · EU 45 · CM / JP 29
11.5	not published	11.5	not published	not published	US women's 13 · UK 10.5 · EU 45.5 · CM / JP 29.5
12	not published	12	not published	not published	US women's 13.5 · UK 11 · EU 46 · CM / JP 30
12.5	not published	12.5	not published	not published	US women's 14 · UK 11.5 · EU 47 · CM / JP 30.5
13	not published	13	not published	not published	US women's 14.5 · UK 12 · EU 47.5 · CM / JP 31
14	not published	14	not published	not published	US women's 15.5 · UK 13 · EU 48.5 · CM / JP 32
15	not published	15	not published	not published	US women's 16.5 · UK 14 · EU 49.5 · CM / JP 33
16	not published	16	not published	not published	US women's 17.5 · UK 15 · EU 50.5 · CM / JP 34

Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

Altra size guide, read on 2026-09-18. Altra on TrueToSize
Nike size guide, read on 2026-09-18. Nike on TrueToSize

Nike to Altra