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Nike to Under Armour shoe size

The short answer

Nike 5.5 is Under Armour 5 by the two brands' own charts. 12 of 13 Nike sizes land on a different label at Under Armour.

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

Every Nike size read across to Under Armour. US women's sizes on the left, US women's on the right.
NikeNike builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
5foot length 22 cmnot made5not publishednot published
5.5foot length 22.5 cm55.5foot length 22.5 cmUK 3 · EU 35.5
6foot length 23 cm5.56foot length 23 cmUK 3.5 · EU 36
6.5foot length 23.5 cm66.5foot length 23.5 cmUK 4 · EU 36.5
7foot length 24 cm77foot length 24 cmUK 5 · EU 38
7.5foot length 24.5 cm87.5foot length 24.5 cmUK 6 · EU 39
8foot length 25 cm8.58foot length 25 cmUK 6 · EU 40
8.5foot length 25.5 cm98.5foot length 25.5 cmUK 6.5 · EU 40.5
9foot length 26 cm9.59foot length 26 cmUK 7 · EU 41
9.5foot length 26.5 cm109.5foot length 26.5 cmUK 7.5 · EU 42
10foot length 27 cm10.510foot length 27 cmUK 8 · EU 42.5
10.5foot length 27.5 cm1110.5foot length 27.5 cmUK 8.5 · EU 43
11foot length 28 cm11.511foot length 28 cmUK 9 · EU 44
11.5foot length 28.5 cm1211.5foot length 28.5 cmUK 9.5 · EU 44.5
12foot length 29 cmnot made12not publishednot published
12.5foot length 29.5 cmnot madenot publishednot publishednot published
13foot length 30 cmnot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Under Armour chart. 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

Under Armour to Nike