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Convert / Women's clothing

Gap to Under Armour clothing size

The short answer

Gap 4 is Under Armour SM by the two brands' own charts.

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

Every Gap size read across to Under Armour. US sizes on the left, Letter on the right.
GapGap builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
000bust 30.3 in, waist 24 in, hip 33.3 innot madeXXSnot publishednot published
000bust 30.3 in, waist 24 in, hip 33.3 innot madeXXSnot publishednot published
000bust 30.3 in, waist 24 in, hip 33.3 innot madeXXSnot publishednot published
2bust 33.3 in, waist 26.5 in, hip 36.3 inXSXSbust 32.5 to 33.5 in, waist 25.5 to 27 inUS 0-2
4bust 34.3 in, waist 27.5 in, hip 37.3 inSMnot publishedbust 33.5 to 36 in, waist 27 to 29 inUS 4-6
6bust 35.3 in, waist 28.5 in, hip 38.3 inSMnot publishedbust 33.5 to 36 in, waist 27 to 29 inUS 4-6
8bust 36.3 in, waist 29.5 in, hip 39.3 inMDnot publishedbust 36 to 38 in, waist 29 to 31 inUS 8-10
10bust 37.3 in, waist 30.5 in, hip 40.3 inMDnot publishedbust 36 to 38 in, waist 29 to 31 inUS 8-10
12bust 38.8 in, waist 32 in, hip 41.8 inLGnot publishedbust 38 to 41 in, waist 31 to 34 inUS 12-14
14bust 40.3 in, waist 33.5 in, hip 43.3 inLGnot publishedbust 38 to 41 in, waist 31 to 34 inUS 12-14
16bust 42 in, waist 35.5 in, hip 45.3 inXLXLbust 41 to 44 in, waist 34 to 37 inUS 16
18bust 43.8 in, waist 37.5 in, hip 47.3 inXLXLbust 41 to 44 in, waist 34 to 37 inUS 16
20bust 45.8 in, waist 39.5 in, hip 49.3 inXXLXXLbust 44 to 47 in, waist 37 to 40 inUS 18
22bust 47.8 in, waist 41.5 in, hip 51.3 in3XLXXLbust 47 to 50 in, waist 40 to 43 inUS 20
Tinted rows change label or sit between two sizes. 3 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 Gap