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Spanx to Gymshark leggings size

The short answer

Spanx 1X is Gymshark XXL by the two brands' own charts. 1 of 6 Spanx sizes land on a different label at Gymshark.

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 Gymshark. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XSwaist 25 to 27 in, hip 34 to 36 inXSXSwaist 26 in, hip 37.5 inUS numeric 4-6
Swaist 27 to 29 in, hip 36 to 38 inSSwaist 28 in, hip 39.5 inUS numeric 6-8
Mwaist 29 to 31 in, hip 38 to 40 inMMwaist 30 in, hip 41.5 inUS numeric 8-10
Lwaist 31 to 33.5 in, hip 40 to 42.5 inLLwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 33.5 to 36 in, hip 42.5 to 45 inXL or XXLXLwaist 34 in, hip 45.5 inUS numeric 12-14
1Xwaist 36 to 39 in, hip 45 to 48 inXXLnot publishedwaist 36 in, hip 47.7 inUS numeric 14-16
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 Gymshark 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

Gymshark to Spanx