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Athleta to Under Armour clothing size

The short answer

Athleta S is Under Armour SM by the two brands' own charts. 5 of 8 Athleta sizes land on a different label at Under Armour.

Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.

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
XXSbust 31.5 in, waist 24.3 in, hip 34 inXXSXXSbust 31 to 32.5 in, waist 24.5 to 25.5 inUS 00
XSbust 32.5 to 33.5 in, waist 25.3 to 26.3 in, hip 35 to 36 inXSXSbust 32.5 to 33.5 in, waist 25.5 to 27 inUS 0-2
Sbust 34.5 to 35.5 in, waist 27.3 to 28.3 in, hip 37 to 38 inSMnot publishedbust 33.5 to 36 in, waist 27 to 29 inUS 4-6
Mbust 36.5 to 37.5 in, waist 29.3 to 30.3 in, hip 39 to 40 inMDnot publishedbust 36 to 38 in, waist 29 to 31 inUS 8-10
Lbust 39 to 40.5 in, waist 31.8 to 33.3 in, hip 41.5 to 43 inLGnot publishedbust 38 to 41 in, waist 31 to 34 inUS 12-14
XLbust 42 in, waist 34.3 in, hip 44.5 inXLXLbust 41 to 44 in, waist 34 to 37 inUS 16
1Xbust 44.3 to 46.3 in, waist 38 to 40 in, hip 47.3 to 49.3 inXXLnot publishedbust 44 to 47 in, waist 37 to 40 inUS 18
2Xbust 48.3 to 50.8 in, waist 42 to 44.5 in, hip 51.3 to 53.8 in3XLnot publishedbust 47 to 50 in, waist 40 to 43 inUS 20
3Xbust 53.3 to 55.8 in, waist 47 to 49.5 in, hip 56.3 to 58.8 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Under Armour chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

Under Armour to Athleta