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Under Armour to Nike leggings size

The short answer

Under Armour XXS is Nike XS by the two brands' own charts. 8 of 11 Under Armour sizes land on a different label at Nike.

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

Every Under Armour size read across to Nike. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSXXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
XSwaist 25.5 to 27 in, hip 34.5 to 36 inSXSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
XXLwaist 37 to 40 in, hip 46 to 49 inXLXXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
3XLwaist 40 to 43 in, hip 49 to 52 in0Xnot publishedwaist 40 to 43 in, hip 48 to 51 inUS numeric 16W
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in0X1Xwaist 40 to 43 in, hip 48 to 51 inUS numeric 16W
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in2X2Xwaist 45.5 to 49 in, hip 54 to 57 inUS numeric 22W-24W
3Xwaist 48.5 to 53 in, hip 54.5 to 58 in3X3Xwaist 49 to 53 in, hip 57 to 61 inUS numeric 26W-28W
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

Nike to Under Armour