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Spanx to Sweaty Betty leggings size

The short answer

Spanx L is Sweaty Betty XL or L by the two brands' own charts. 3 of 6 Spanx sizes land on a different label at Sweaty Betty.

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

Every Spanx size read across to Sweaty Betty. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
XSwaist 25 to 27 in, hip 34 to 36 inXS or SXSwaist 25 in, hip 36 inUS numeric 4
Swaist 27 to 29 in, hip 36 to 38 inS or MSwaist 27 in, hip 38 inUS numeric 6
Mwaist 29 to 31 in, hip 38 to 40 inM or LMwaist 29 in, hip 40 inUS numeric 8
Lwaist 31 to 33.5 in, hip 40 to 42.5 inXL or LLwaist 33 in, hip 44 inUS numeric 12
XLwaist 33.5 to 36 in, hip 42.5 to 45 inXXL or XLXLwaist 36 in, hip 46.5 inUS numeric 14
1Xwaist 36 to 39 in, hip 45 to 48 inXXLnot publishedwaist 36 in, hip 46.5 inUS numeric 14
2Xwaist 39 to 42 in, hip 48 to 51 innot madenot publishednot publishednot published
3Xwaist 42 to 45 in, hip 51 to 54 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Sweaty Betty 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

Sweaty Betty to Spanx