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Nike to Under Armour leggings size

The short answer

Nike XS is Under Armour XXS by the two brands' own charts. 8 of 11 Nike 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.

On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

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
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 innot madeXXSnot publishednot published
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXXSXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
Swaist 26 to 29 in, hip 35.5 to 38.5 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXLXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
XXLwaist 38.5 to 42.5 in, hip 47 to 50 in1XXXLwaist 39 to 43.5 in, hip 47 to 50.5 inUS numeric 16W-18W
0Xwaist 40 to 43 in, hip 48 to 51 in3XLnot publishedwaist 40 to 43 in, hip 49 to 52 inUS numeric 20
1Xwaist 43 to 45.5 in, hip 51 to 54 in2X1Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
2Xwaist 45.5 to 49 in, hip 54 to 57 in2X2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
3Xwaist 49 to 53 in, hip 57 to 61 in3X3Xwaist 48.5 to 53 in, hip 54.5 to 58 inUS numeric 24W-26W
4Xwaist 53 to 57 in, hip 61 to 65 in3Xnot publishedwaist 48.5 to 53 in, hip 54.5 to 58 inUS numeric 24W-26W
Tinted rows change label or sit between two sizes. 1 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