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Old Navy to Nike leggings size

The short answer

Old Navy XXS is Nike XS by the two brands' own charts. 5 of 10 Old Navy 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.

Every Old Navy size read across to Nike. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 24 in, hip 34.5 inXSXXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
XSwaist 25 to 26 in, hip 35.5 to 36.5 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 30 in, hip 39.5 to 40.5 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 42 to 44 inLLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 36.3 to 39 in, hip 46.5 to 49 inXLXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
XXLwaist 42 in, hip 51.5 in0XXXLwaist 40 to 43 in, hip 48 to 51 inUS numeric 16W
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 in1X2Xwaist 43 to 45.5 in, hip 51 to 54 inUS numeric 18W-20W
3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 in2X3Xwaist 45.5 to 49 in, hip 54 to 57 inUS numeric 22W-24W
4Xwaist 51.5 to 54 in, hip 61 to 63.5 in3X4Xwaist 49 to 53 in, hip 57 to 61 inUS numeric 26W-28W
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 Old Navy