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Spanx to Under Armour leggings size

The short answer

Spanx S is Under Armour SM by the two brands' own charts. 6 of 8 Spanx sizes land on a different label at Under Armour.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

On 2 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Spanx size read across to Under Armour. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XSwaist 25 to 27 in, hip 34 to 36 inXSXSwaist 25.5 to 27 in, hip 34.5 to 36 inUS numeric 0-2
Swaist 27 to 29 in, hip 36 to 38 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 29 to 31 in, hip 38 to 40 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 31 to 33.5 in, hip 40 to 42.5 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 33.5 to 36 in, hip 42.5 to 45 inXLXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
1Xwaist 36 to 39 in, hip 45 to 48 inXXL1Xwaist 37 to 40 in, hip 46 to 49 inUS numeric 18
2Xwaist 39 to 42 in, hip 48 to 51 in1X2Xwaist 39 to 43.5 in, hip 47 to 50.5 inUS numeric 16W-18W
3Xwaist 42 to 45 in, hip 51 to 54 in1X3Xwaist 39 to 43.5 in, hip 47 to 50.5 inUS numeric 16W-18W
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

Under Armour to Spanx