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Nike to Spanx leggings size

The short answer

Nike XL is Spanx 1X by the two brands' own charts. 5 of 9 Nike sizes land on a different label at Spanx.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

On 1 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 Spanx. Letter sizes on the left, Letter on the right.
NikeNike builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 innot madenot publishednot publishednot published
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMMwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLLwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XLwaist 34.5 to 38.5 in, hip 44 to 47 in1XXLwaist 36 to 39 in, hip 45 to 48 inUS numeric 18-20
XXLwaist 38.5 to 42.5 in, hip 47 to 50 in2Xnot publishedwaist 39 to 42 in, hip 48 to 51 inUS numeric 22-24
0Xwaist 40 to 43 in, hip 48 to 51 in2Xnot publishedwaist 39 to 42 in, hip 48 to 51 inUS numeric 22-24
1Xwaist 43 to 45.5 in, hip 51 to 54 in3X1Xwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
2Xwaist 45.5 to 49 in, hip 54 to 57 in3X2Xwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
3Xwaist 49 to 53 in, hip 57 to 61 innot made3Xnot publishednot published
4Xwaist 53 to 57 in, hip 61 to 65 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Spanx 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

Spanx to Nike