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Spanx to Old Navy leggings size

The short answer

Spanx XL is Old Navy L or XL by the two brands' own charts. 4 of 8 Spanx 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 Spanx size read across to Old Navy. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XSwaist 25 to 27 in, hip 34 to 36 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 27 to 29 in, hip 36 to 38 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31 in, hip 38 to 40 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
Lwaist 31 to 33.5 in, hip 40 to 42.5 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 33.5 to 36 in, hip 42.5 to 45 inL or XLXLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
1Xwaist 36 to 39 in, hip 45 to 48 inXLnot publishedwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
2Xwaist 39 to 42 in, hip 48 to 51 inXXL2Xwaist 42 in, hip 51.5 inUS numeric 20
3Xwaist 42 to 45 in, hip 51 to 54 in2X3Xwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS numeric 20-22
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 Spanx