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Under Armour to Old Navy leggings size

The short answer

Under Armour XXS is Old Navy XS by the two brands' own charts. 9 of 11 Under Armour sizes land on a different label at Old Navy.

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 Old Navy. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSXXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
XSwaist 25.5 to 27 in, hip 34.5 to 36 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXL or LXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
XXLwaist 37 to 40 in, hip 46 to 49 inXLXXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
3XLwaist 40 to 43 in, hip 49 to 52 inXXLnot publishedwaist 42 in, hip 51.5 inUS numeric 20
1Xwaist 39 to 43.5 in, hip 47 to 50.5 inXXLnot publishedwaist 42 in, hip 51.5 inUS numeric 20
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in3X or 2X2Xwaist 46.6 to 49 in, hip 56.1 to 58.5 inUS numeric 24-26
3Xwaist 48.5 to 53 in, hip 54.5 to 58 in4X or 3X3Xwaist 51.5 to 54 in, hip 61 to 63.5 inUS numeric 28-30
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

Old Navy to Under Armour