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Uniqlo to Under Armour leggings size

The short answer

Uniqlo XS is Under Armour XXS by the two brands' own charts. 6 of 7 Uniqlo sizes land on a different label at Under Armour.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Uniqlo size read across to Under Armour. Letter sizes on the left, Letter on the right.
UniqloUniqlo builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 22.5 to 24.8 in, hip 32.8 to 35 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 24 to 26.5 in, hip 34.3 to 36.5 inXXSXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
Swaist 25.5 to 28 in, hip 35.8 to 38.3 inXSnot publishedwaist 25.5 to 27 in, hip 34.5 to 36 inUS numeric 0-2
Mwaist 27.3 to 29.5 in, hip 37.5 to 39.8 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Lwaist 29.5 to 32 in, hip 39.8 to 42.3 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
XLwaist 32 to 34.3 in, hip 42.3 to 44.5 inLGXLwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XXLwaist 34.3 to 36.5 in, hip 44.5 to 46.8 inXLXXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
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

Under Armour to Uniqlo