Skechers to Altra men's shoe size

The short answer

Skechers 13.5 is Altra 13 or 14 by the two brands' own charts. 1 of 18 Skechers sizes land on a different label at Altra.

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 Skechers size read across to Altra. US men's sizes on the left, US men's on the right.
Skechers	Skechers builds it for	Altra, by chart	Same label	Altra builds it for	Altra also prints
6.5	not published	6.5	not published	not published	UK 5.5 · EU 39.5 · CM / JP 24.5
7	not published	7	not published	not published	UK 6 · EU 40 · CM / JP 25
7.5	not published	7.5	not published	not published	UK 6.5 · EU 40.5 · CM / JP 25.5
8	not published	8	not published	not published	UK 7 · EU 41 · CM / JP 26
8.5	not published	8.5	not published	not published	UK 7.5 · EU 42 · CM / JP 26.5
9	not published	9	not published	not published	UK 8 · EU 42.5 · CM / JP 27
9.5	not published	9.5	not published	not published	UK 8.5 · EU 43 · CM / JP 27.5
10	not published	10	not published	not published	UK 9 · EU 44 · CM / JP 28
10.5	not published	10.5	not published	not published	UK 9.5 · EU 44.5 · CM / JP 28.5
11	not published	11	not published	not published	UK 10 · EU 45 · CM / JP 29
11.5	not published	11.5	not published	not published	UK 10.5 · EU 46 · CM / JP 29.5
12	not published	12	not published	not published	UK 11 · EU 46.5 · CM / JP 30
12.5	not published	12.5	not published	not published	UK 11.5 · EU 47 · CM / JP 30.5
13	not published	13	not published	not published	UK 12 · EU 48 · CM / JP 31
13.5	not published	13 or 14	not published	not published	UK 12 · EU 48 · CM / JP 31
14	not published	14	not published	not published	UK 13 · EU 49 · CM / JP 32
15	not published	15	not published	not published	UK 14 · EU 50 · CM / JP 33
16	not published	16	not published	not published	UK 15 · EU 51.5 · 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

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

Altra to Skechers