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Nike to adidas leggings size

The short answer

Nike XXS is adidas 2XS by the two brands' own charts. 7 of 11 Nike sizes land on a different label at adidas.

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 Nike size read across to adidas. Letter sizes on the left, Letter on the right.
NikeNike builds it foradidas, by chartSame labeladidas builds it foradidas also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 in2XS2XSwaist 22 to 23.5 in, hip 31.5 to 33 in, inseam 30.5 inUS numeric 00
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXSXSwaist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 inUS numeric 0-2
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 26.5 to 28.5 in, hip 36 to 38 in, inseam 31 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMMwaist 29 to 31 in, hip 38.5 to 40.5 in, inseam 31.5 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLLwaist 31.5 to 33.5 in, hip 41 to 43 in, inseam 31.5 inUS numeric 12-14
XLwaist 34.5 to 38.5 in, hip 44 to 47 in1XXLwaist 35 to 38.5 in, hip 43.5 to 47 in, inseam 31 inUS numeric 14W-16W
XXLwaist 38.5 to 42.5 in, hip 47 to 50 in2X2XLwaist 39 to 42.5 in, hip 47.5 to 51 in, inseam 31 inUS numeric 18W-20W
0Xwaist 40 to 43 in, hip 48 to 51 in2Xnot publishedwaist 39 to 42.5 in, hip 47.5 to 51 in, inseam 31 inUS numeric 18W-20W
1Xwaist 43 to 45.5 in, hip 51 to 54 in3X1Xwaist 43 to 46.5 in, hip 51.5 to 55 in, inseam 30.5 inUS numeric 22W-24W
2Xwaist 45.5 to 49 in, hip 54 to 57 in4X2Xwaist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 inUS numeric 26W-28W
3Xwaist 49 to 53 in, hip 57 to 61 in4X3Xwaist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 inUS numeric 26W-28W
4Xwaist 53 to 57 in, hip 61 to 65 innot made4Xnot publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the adidas 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

adidas to Nike