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Under Armour to Zella leggings size

The short answer

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

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 Zella. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forZella, by chartSame labelZella builds it forZella also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSXXSwaist 25 to 26 in, hip 34.5 to 35.5 inUS numeric 0-2
XSwaist 25.5 to 27 in, hip 34.5 to 36 inXSXSwaist 25 to 26 in, hip 34.5 to 35.5 inUS numeric 0-2
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 27 to 28 in, hip 36.5 to 37.5 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 29 to 30 in, hip 38.5 to 39.5 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31.5 to 33.5 in, hip 41.5 to 43.5 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 35.5 in, hip 45.5 inUS numeric 16
XXLwaist 37 to 40 in, hip 46 to 49 inXXLXXLwaist 38 in, hip 48.5 inUS numeric 18
3XLwaist 40 to 43 in, hip 49 to 52 in2Xnot publishedwaist 40.5 in, hip 51 inUS numeric 20
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in2Xnot publishedwaist 40.5 in, hip 51 inUS numeric 20
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in3X or 4X2Xwaist 43 to 45 in, hip 53.3 to 55.5 inUS numeric 22-24
3Xwaist 48.5 to 53 in, hip 54.5 to 58 in4X3Xwaist 47 to 49 in, hip 57.8 to 60 inUS numeric 26-28
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

Zella to Under Armour