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Adidas to Nike leggings size

The short answer

adidas 2XS is Nike XXS by the two brands' own charts. 6 of 11 adidas 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 4 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 adidas size read across to Nike. Letter sizes on the left, Letter on the right.
adidasadidas builds it forNike, by chartSame labelNike builds it forNike also prints
2XSwaist 22 to 23.5 in, hip 31.5 to 33 in, inseam 30.5 inXXSXXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inUS numeric 0
XSwaist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 26.5 to 28.5 in, hip 36 to 38 in, inseam 31 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31 in, hip 38.5 to 40.5 in, inseam 31.5 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 41 to 43 in, inseam 31.5 inLLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43.5 to 46 in, inseam 31.5 inXLXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
2XLwaist 37.5 to 41 in, hip 46.5 to 49 in, inseam 32 inXXLXXLwaist 38.5 to 42.5 in, hip 47 to 50 inUS numeric 20-22
1Xwaist 35 to 38.5 in, hip 43.5 to 47 in, inseam 31 inXL1Xwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
2Xwaist 39 to 42.5 in, hip 47.5 to 51 in, inseam 31 inXXL2Xwaist 38.5 to 42.5 in, hip 47 to 50 inUS numeric 20-22
3Xwaist 43 to 46.5 in, hip 51.5 to 55 in, inseam 30.5 in1X3Xwaist 43 to 45.5 in, hip 51 to 54 inUS numeric 18W-20W
4Xwaist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 in2X4Xwaist 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 adidas