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Nike to Smartwool leggings size

The short answer

Nike M is Smartwool S by the two brands' own charts. 7 of 8 Nike sizes land on a different label at Smartwool.

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 Smartwool. Letter sizes on the left, Letter on the right.
NikeNike builds it forSmartwool, by chartSame labelSmartwool builds it forSmartwool 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 innot madenot publishednot publishednot published
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 29 to 31 in, hip 36 to 38 innot published
Mwaist 29 to 31.5 in, hip 38.5 to 41 inSMwaist 29 to 31 in, hip 36 to 38 innot published
Lwaist 31.5 to 34.5 in, hip 41 to 44 inMLwaist 32 to 34 in, hip 39 to 41 innot published
XLwaist 34.5 to 38.5 in, hip 44 to 47 inLXLwaist 35 to 37 in, hip 42 to 44 innot published
XXLwaist 38.5 to 42.5 in, hip 47 to 50 inXL or XXLXXLwaist 38 to 40 in, hip 45 to 48 innot published
0Xwaist 40 to 43 in, hip 48 to 51 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
1Xwaist 43 to 45.5 in, hip 51 to 54 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
2Xwaist 45.5 to 49 in, hip 54 to 57 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
3Xwaist 49 to 53 in, hip 57 to 61 innot madenot publishednot 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. 4 sizes have no counterpart on the Smartwool 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

Smartwool to Nike