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Spanx to Nike leggings size

The short answer

Spanx 1X is Nike XL by the two brands' own charts. 3 of 8 Spanx 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.

On 3 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 Spanx size read across to Nike. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forNike, by chartSame labelNike builds it forNike also prints
XSwaist 25 to 27 in, hip 34 to 36 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 27 to 29 in, hip 36 to 38 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31 in, hip 38 to 40 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 31 to 33.5 in, hip 40 to 42.5 inLLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 33.5 to 36 in, hip 42.5 to 45 inXLXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
1Xwaist 36 to 39 in, hip 45 to 48 inXL1Xwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
2Xwaist 39 to 42 in, hip 48 to 51 inXXL2Xwaist 38.5 to 42.5 in, hip 47 to 50 inUS numeric 20-22
3Xwaist 42 to 45 in, hip 51 to 54 in1X3Xwaist 43 to 45.5 in, hip 51 to 54 inUS numeric 18W-20W
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 Spanx