Nike to American Eagle size
The short answer
Nike S is American Eagle XS by the two brands' own charts. 4 of 7 Nike sizes land on a different label at American Eagle.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
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.
| Nike | Nike builds it for | American Eagle, by chart | Same label | American Eagle builds it for | American Eagle also prints |
|---|---|---|---|---|---|
| XXS | chest 28.1 to 31.5 in, waist 22.5 to 25.5 in, hip 28.5 to 31.5 in | not made | not published | not published | not published |
| XS | chest 31.5 to 35 in, waist 25.5 to 29 in, hip 31.5 to 35 in | XS | XS | chest 35 to 36 in, neck 13.5 to 14 in, sleeve 31.5 in | not published |
| S | chest 35 to 37.5 in, waist 29 to 32 in, hip 35 to 37.5 in | XS | S | chest 35 to 36 in, neck 13.5 to 14 in, sleeve 31.5 in | not published |
| M | chest 37.5 to 41 in, waist 32 to 35 in, hip 37.5 to 41 in | S | M | chest 37 to 39 in, neck 14.5 to 15 in, sleeve 32.5 in | not published |
| L | chest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 in | M | L | chest 40 to 42 in, neck 15 to 15.5 in, sleeve 33.5 in | not published |
| XL | chest 44 to 48.5 in, waist 38 to 43 in, hip 44 to 47 in | XL | XL | chest 46 to 48 in, neck 16.5 to 17 in, sleeve 35.5 in | not published |
| XXL | chest 48.5 to 53.5 in, waist 43 to 47.5 in, hip 47 to 50.5 in | XXL | XXL | chest 49 to 51 in, neck 17 to 18 in, sleeve 36.5 in | not published |
| 3XL | chest 53.5 to 58 in, waist 47.5 to 52.5 in, hip 50.5 to 53.5 in | XXXL | XXXL | chest 52 to 54 in, neck 18 to 19 in, sleeve 37 in | not published |
| 4XL | chest 58 to 63 in, waist 52.5 to 57 in, hip 53.5 to 58.5 in | not made | not published | not published | not published |
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.
Sources
- Nike size guide, read on 2026-09-18. Nike on TrueToSize
- American Eagle size guide, read on 2026-09-18. American Eagle on TrueToSize