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Under Armour to adidas leggings size

The short answer

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

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 adidas. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it foradidas, by chartSame labeladidas builds it foradidas also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXS2XSwaist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 inUS numeric 0-2
XSwaist 25.5 to 27 in, hip 34.5 to 36 inXSXSwaist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 inUS numeric 0-2
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 26.5 to 28.5 in, hip 36 to 38 in, inseam 31 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 29 to 31 in, hip 38.5 to 40.5 in, inseam 31.5 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31.5 to 33.5 in, hip 41 to 43 in, inseam 31.5 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 34 to 37 in, hip 43.5 to 46 in, inseam 31.5 inUS numeric 16-18
XXLwaist 37 to 40 in, hip 46 to 49 in2XL2XLwaist 37.5 to 41 in, hip 46.5 to 49 in, inseam 32 inUS numeric 20
3XLwaist 40 to 43 in, hip 49 to 52 in2Xnot publishedwaist 39 to 42.5 in, hip 47.5 to 51 in, inseam 31 inUS numeric 18W-20W
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in2X1Xwaist 39 to 42.5 in, hip 47.5 to 51 in, inseam 31 inUS numeric 18W-20W
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in3X2Xwaist 43 to 46.5 in, hip 51.5 to 55 in, inseam 30.5 inUS numeric 22W-24W
3Xwaist 48.5 to 53 in, hip 54.5 to 58 in4X3Xwaist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 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

adidas to Under Armour