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Nike to Under Armour size

The short answer

Nike XXS is Under Armour XS by the two brands' own charts. 5 of 9 Nike sizes land on a different label at Under Armour.

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

Every Nike size read across to Under Armour. Letter sizes on the left, Letter on the right.
NikeNike builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSchest 28.1 to 31.5 in, waist 22.5 to 25.5 in, hip 28.5 to 31.5 inXSnot publishedchest 31 to 34 in, waist 28 to 29 innot published
XSchest 31.5 to 35 in, waist 25.5 to 29 in, hip 31.5 to 35 inXSXSchest 31 to 34 in, waist 28 to 29 innot published
Schest 35 to 37.5 in, waist 29 to 32 in, hip 35 to 37.5 inSMnot publishedchest 34 to 37 in, waist 29 to 31 innot published
Mchest 37.5 to 41 in, waist 32 to 35 in, hip 37.5 to 41 inMDnot publishedchest 37 to 41 in, waist 31 to 34 innot published
Lchest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 inLGnot publishedchest 41 to 44 in, waist 34 to 37 innot published
XLchest 44 to 48.5 in, waist 38 to 43 in, hip 44 to 47 inXLXLchest 44 to 48 in, waist 37 to 41 innot published
XXLchest 48.5 to 53.5 in, waist 43 to 47.5 in, hip 47 to 50.5 inXXLXXLchest 48 to 52 in, waist 41 to 45.5 innot published
3XLchest 53.5 to 58 in, waist 47.5 to 52.5 in, hip 50.5 to 53.5 in3XL3XLchest 52 to 56 in, waist 45.5 to 50 innot published
4XLchest 58 to 63 in, waist 52.5 to 57 in, hip 53.5 to 58.5 in5XL4XLchest 60 to 64 in, waist 54.5 to 59 innot published
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, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

Under Armour to Nike