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Under Armour to Athleta leggings size

The short answer

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

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 Athleta. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSXXSwaist 25.3 to 26.3 in, hip 35 to 36 inUS numeric 0-2
XSwaist 25.5 to 27 in, hip 34.5 to 36 inXSXSwaist 25.3 to 26.3 in, hip 35 to 36 inUS numeric 0-2
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 27.3 to 28.3 in, hip 37 to 38 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 29.3 to 30.3 in, hip 39 to 40 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31.8 to 33.3 in, hip 41.5 to 43 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 34.3 in, hip 44.5 inUS numeric 16-18
XXLwaist 37 to 40 in, hip 46 to 49 in1Xnot publishedwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
3XLwaist 40 to 43 in, hip 49 to 52 in2X or 1Xnot publishedwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in2X or 1X1Xwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in3X or 2X2Xwaist 47 to 49.5 in, hip 56.3 to 58.8 inUS numeric 24W-26W
3Xwaist 48.5 to 53 in, hip 54.5 to 58 in3X3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 inUS numeric 24W-26W
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

Athleta to Under Armour