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Nike to Athleta leggings size

The short answer

Nike XS is Athleta XXS by the two brands' own charts. 6 of 11 Nike sizes land on a different label at Athleta.

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

Every Nike size read across to Athleta. Letter sizes on the left, Letter on the right.
NikeNike builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inXXSXXSwaist 24.3 in, hip 34 inUS numeric 00
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXXSXSwaist 24.3 in, hip 34 inUS numeric 00
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 27.3 to 28.3 in, hip 37 to 38 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMMwaist 29.3 to 30.3 in, hip 39 to 40 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLLwaist 31.8 to 33.3 in, hip 41.5 to 43 inUS numeric 12-14
XLwaist 34.5 to 38.5 in, hip 44 to 47 in1X or XLXLwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
XXLwaist 38.5 to 42.5 in, hip 47 to 50 in1X or 2Xnot publishedwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
0Xwaist 40 to 43 in, hip 48 to 51 in2X or 1Xnot publishedwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
1Xwaist 43 to 45.5 in, hip 51 to 54 in2X1Xwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
2Xwaist 45.5 to 49 in, hip 54 to 57 in3X2Xwaist 47 to 49.5 in, hip 56.3 to 58.8 inUS numeric 24W-26W
3Xwaist 49 to 53 in, hip 57 to 61 in3X3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 inUS numeric 24W-26W
4Xwaist 53 to 57 in, hip 61 to 65 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Athleta chart. 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

Athleta to Nike