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Sweaty Betty to Spanx leggings size

The short answer

Sweaty Betty S is Spanx XS by the two brands' own charts. 5 of 6 Sweaty Betty 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.

Every Sweaty Betty size read across to Spanx. Letter sizes on the left, Letter on the right.
Sweaty BettySweaty Betty builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XXSwaist 23 in, hip 34 innot madenot publishednot publishednot published
XSwaist 25 in, hip 36 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Swaist 27 in, hip 38 inXSSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Mwaist 29 in, hip 40 inSMwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Lwaist 31 in, hip 42 inMLwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
XLwaist 33 in, hip 44 inLXLwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XXLwaist 36 in, hip 46.5 inXLnot publishedwaist 33.5 to 36 in, hip 42.5 to 45 inUS numeric 16
Tinted rows change label or sit between two sizes. 1 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 Sweaty Betty