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Under Armour to Spanx leggings size

The short answer

Under Armour XXS is Spanx XS by the two brands' own charts. 8 of 10 Under Armour sizes land on a different label at Spanx.

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 Spanx. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSnot publishedwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
XSwaist 25.5 to 27 in, hip 34.5 to 36 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 33.5 to 36 in, hip 42.5 to 45 inUS numeric 16
XXLwaist 37 to 40 in, hip 46 to 49 in1Xnot publishedwaist 36 to 39 in, hip 45 to 48 inUS numeric 18-20
3XLwaist 40 to 43 in, hip 49 to 52 in2Xnot publishedwaist 39 to 42 in, hip 48 to 51 inUS numeric 22-24
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in2X1Xwaist 39 to 42 in, hip 48 to 51 inUS numeric 22-24
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in3X2Xwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
3Xwaist 48.5 to 53 in, hip 54.5 to 58 innot made3Xnot publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Spanx chart. 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

Spanx to Under Armour