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Adidas to Altra shoe size

The short answer

adidas 5 is Altra 5.5 by the two brands' own charts. 11 of 17 adidas sizes land on a different label at Altra.

Both brands publish the foot length each size is built for, so every row matches a foot, not a label.

Every adidas size read across to Altra. US women's sizes on the left, US women's on the right.
adidasadidas builds it forAltra, by chartSame labelAltra builds it forAltra also prints
5foot length 22.1 cm5.55foot length 22 cmUK 3.5 · EU 36
5.5foot length 22.5 cm65.5foot length 22.5 cmUK 4 · EU 37
6foot length 22.9 cm6.56foot length 23 cmUK 4.5 · EU 37.5
6.5foot length 23.3 cm7 or 6.56.5foot length 23.5 cmUK 5 · EU 38
7foot length 23.8 cm7.5 or 77foot length 24 cmUK 5.5 · EU 38.5
7.5foot length 24.2 cm7.5 or 87.5foot length 24 cmUK 5.5 · EU 38.5
8foot length 24.6 cm88foot length 24.5 cmUK 6 · EU 39
8.5foot length 25 cm8.58.5foot length 25 cmUK 6.5 · EU 40
9foot length 25.5 cm99foot length 25.5 cmUK 7 · EU 40.5
9.5foot length 25.9 cm9.59.5foot length 26 cmUK 7.5 · EU 41
10foot length 26.3 cm10 or 9.510foot length 26.5 cmUK 8 · EU 42
10.5foot length 26.7 cm10 or 10.510.5foot length 26.5 cmUK 8 · EU 42
11foot length 27.1 cm10.511foot length 27 cmUK 8.5 · EU 42.5
11.5foot length 27.6 cm1111.5foot length 27.5 cmUK 9 · EU 43
12foot length 28 cm11.512foot length 28 cmUK 9.5 · EU 44
12.5foot length 28.4 cm12not publishedfoot length 28.5 cmUK 10 · EU 44.5
13foot length 28.8 cm1213foot length 28.5 cmUK 10 · EU 44.5
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 adidas