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Smartwool to Nike leggings size

The short answer

Smartwool S is Nike M by the two brands' own charts. 5 of 5 Smartwool 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 Smartwool size read across to Nike. Letter sizes on the left, Letter on the right.
SmartwoolSmartwool builds it forNike, by chartSame labelNike builds it forNike also prints
Swaist 29 to 31 in, hip 36 to 38 inMSwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Mwaist 32 to 34 in, hip 39 to 41 inLMwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
Lwaist 35 to 37 in, hip 42 to 44 inXLLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
XLwaist 38 to 40 in, hip 45 to 48 inXXLXLwaist 38.5 to 42.5 in, hip 47 to 50 inUS numeric 20-22
XXLwaist 41 to 44 in, hip 49 to 51 in0XXXLwaist 40 to 43 in, hip 48 to 51 inUS numeric 16W
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 Smartwool