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Nike to Old Navy leggings size

The short answer

Nike 0X is Old Navy XXL by the two brands' own charts. 4 of 12 Nike sizes land on a different label at Old Navy.

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 Old Navy. Letter sizes on the left, Letter on the right.
NikeNike builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inXXSXXSwaist 24 in, hip 34.5 inUS numeric 00
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXLXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
XXLwaist 38.5 to 42.5 in, hip 47 to 50 inXXLXXLwaist 42 in, hip 51.5 inUS numeric 20
0Xwaist 40 to 43 in, hip 48 to 51 inXXLnot publishedwaist 42 in, hip 51.5 inUS numeric 20
1Xwaist 43 to 45.5 in, hip 51 to 54 in2Xnot publishedwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS numeric 20-22
2Xwaist 45.5 to 49 in, hip 54 to 57 in3X2Xwaist 46.6 to 49 in, hip 56.1 to 58.5 inUS numeric 24-26
3Xwaist 49 to 53 in, hip 57 to 61 in4X or 3X3Xwaist 51.5 to 54 in, hip 61 to 63.5 inUS numeric 28-30
4Xwaist 53 to 57 in, hip 61 to 65 in4X4Xwaist 51.5 to 54 in, hip 61 to 63.5 inUS numeric 28-30
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

Old Navy to Nike