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American Eagle to GU size

The short answer

American Eagle XS is GU M by the two brands' own charts. 9 of 9 American Eagle sizes land on a different label at GU.

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

On 3 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 American Eagle size read across to GU Japan sizing. Letter sizes on the left, Letter on the right.
American EagleAmerican Eagle builds it forGU Japan sizing, by chartSame labelGU builds it forGU also prints
XSchest 35 to 36 in, neck 13.5 to 14 in, sleeve 31.5 inMXSchest 34.7 to 37.8 in, waist 29.9 to 33.1 innot published
Schest 37 to 39 in, neck 14.5 to 15 in, sleeve 32.5 inLSchest 37.8 to 40.9 in, waist 33.1 to 36.2 innot published
Mchest 40 to 42 in, neck 15 to 15.5 in, sleeve 33.5 inXLMchest 40.9 to 44.1 in, waist 36.2 to 39.4 innot published
M TALLchest 40 to 42 in, neck 15 to 15.5 in, sleeve 34.5 inXLnot publishedchest 40.9 to 44.1 in, waist 36.2 to 39.4 innot published
Lchest 43 to 45 in, neck 15.5 to 16 in, sleeve 34.5 inXLLchest 40.9 to 44.1 in, waist 36.2 to 39.4 innot published
L TALLchest 43 to 45 in, neck 15.5 to 16 in, sleeve 35.5 inXLnot publishedchest 40.9 to 44.1 in, waist 36.2 to 39.4 innot published
XLchest 46 to 48 in, neck 16.5 to 17 in, sleeve 35.5 inXXLXLchest 44.1 to 47.2 in, waist 39.4 to 42.5 innot published
XL TALLchest 46 to 48 in, neck 16.5 to 17 in, sleeve 36.5 inXXLnot publishedchest 44.1 to 47.2 in, waist 39.4 to 42.5 innot published
XXLchest 49 to 51 in, neck 17 to 18 in, sleeve 36.5 in3XLXXLchest 47.2 to 50.4 in, waist 42.5 to 45.7 innot published
XXXLchest 52 to 54 in, neck 18 to 19 in, sleeve 37 innot made3XLnot publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the GU 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

GU to American Eagle