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Athleta to Nike leggings size

The short answer

Athleta XXS is Nike XS by the two brands' own charts. 5 of 9 Athleta sizes land on a different label at Nike.

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 Nike. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 24.3 in, hip 34 inXSXXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 27.3 to 28.3 in, hip 37 to 38 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 29.3 to 30.3 in, hip 39 to 40 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inLLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 34.3 in, hip 44.5 inLXLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
1Xwaist 38 to 40 in, hip 47.3 to 49.3 inXXL1Xwaist 38.5 to 42.5 in, hip 47 to 50 inUS numeric 20-22
2Xwaist 42 to 44.5 in, hip 51.3 to 53.8 in1X2Xwaist 43 to 45.5 in, hip 51 to 54 inUS numeric 18W-20W
3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 in2X3Xwaist 45.5 to 49 in, hip 54 to 57 inUS numeric 22W-24W
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

Nike to Athleta