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Athleta to Under Armour leggings size

The short answer

Athleta S is Under Armour SM by the two brands' own charts. 6 of 9 Athleta 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 1 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 Athleta size read across to Under Armour. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 24.3 in, hip 34 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXSXSwaist 25.5 to 27 in, hip 34.5 to 36 inUS numeric 0-2
Swaist 27.3 to 28.3 in, hip 37 to 38 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 29.3 to 30.3 in, hip 39 to 40 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 34.3 in, hip 44.5 inXLXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
1Xwaist 38 to 40 in, hip 47.3 to 49.3 inXXL1Xwaist 37 to 40 in, hip 46 to 49 inUS numeric 18
2Xwaist 42 to 44.5 in, hip 51.3 to 53.8 in1X2Xwaist 39 to 43.5 in, hip 47 to 50.5 inUS numeric 16W-18W
3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 in2X3Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
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 Athleta