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Convert / Shoes

Brooks to Altra shoe size

The short answer

Brooks 12.5 is Altra 12 or 13 by the two brands' own charts. 1 of 17 Brooks 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 Brooks size read across to Altra. US women's sizes on the left, US women's on the right.
BrooksBrooks builds it forAltra, by chartSame labelAltra builds it forAltra also prints
5not published5not publishedfoot length 21.5 cmUK 3 · EU 35.5
5.5not published5.5not publishedfoot length 22 cmUK 3.5 · EU 36
6not published6not publishedfoot length 22.5 cmUK 4 · EU 37
6.5not published6.5not publishedfoot length 23 cmUK 4.5 · EU 37.5
7not published7not publishedfoot length 23.5 cmUK 5 · EU 38
7.5not published7.5not publishedfoot length 24 cmUK 5.5 · EU 38.5
8not published8not publishedfoot length 24.5 cmUK 6 · EU 39
8.5not published8.5not publishedfoot length 25 cmUK 6.5 · EU 40
9not published9not publishedfoot length 25.5 cmUK 7 · EU 40.5
9.5not published9.5not publishedfoot length 26 cmUK 7.5 · EU 41
10not published10not publishedfoot length 26.5 cmUK 8 · EU 42
10.5not published10.5not publishedfoot length 27 cmUK 8.5 · EU 42.5
11not published11not publishedfoot length 27.5 cmUK 9 · EU 43
11.5not published11.5not publishedfoot length 28 cmUK 9.5 · EU 44
12not published12not publishedfoot length 28.5 cmUK 10 · EU 44.5
12.5not published12 or 13not publishedfoot length 28.5 cmUK 10 · EU 44.5
13not published13not publishedfoot length 29.5 cmUK 11 · EU 46
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. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Altra to Brooks