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ASICS to Under Armour shoe size

The short answer

ASICS 5.5 is Under Armour 5 or 5.5 by the two brands' own charts. 7 of 16 ASICS 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 ASICS size read across to Under Armour. US women's sizes on the left, US women's on the right.
ASICSASICS builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
4foot length 21.5 cmnot madenot publishednot publishednot published
4.5foot length 22 cmnot madenot publishednot publishednot published
5foot length 22.5 cm55foot length 22.5 cmUK 3 · EU 35.5
5.5foot length 22.8 cm5 or 5.55.5foot 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 25.8 cm9 or 9.59foot length 25.5 cmUK 6.5 · EU 40.5
9.5foot length 26 cm9.59.5foot length 26 cmUK 7 · EU 41
10foot length 26.5 cm1010foot length 26.5 cmUK 7.5 · EU 42
10.5foot length 27 cm10.510.5foot length 27 cmUK 8 · EU 42.5
11foot length 27.5 cm1111foot length 27.5 cmUK 8.5 · EU 43
11.5foot length 28 cm11.511.5foot length 28 cmUK 9 · EU 44
12foot length 28.5 cm1212foot length 28.5 cmUK 9.5 · EU 44.5
12.5foot length 28.8 cm12not publishedfoot length 28.5 cmUK 9.5 · EU 44.5
13foot length 29 cmnot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 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 ASICS