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Sweaty Betty to Gymshark leggings size

The short answer

Sweaty Betty XS is Gymshark XXS or XS by the two brands' own charts. 5 of 7 Sweaty Betty 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 Sweaty Betty size read across to Gymshark. Letter sizes on the left, Letter on the right.
Sweaty BettySweaty Betty builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 23 in, hip 34 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 25 in, hip 36 inXXS or XSXSwaist 24 in, hip 35.5 inUS numeric 2-4
Swaist 27 in, hip 38 inXS or SSwaist 26 in, hip 37.5 inUS numeric 4-6
Mwaist 29 in, hip 40 inS or MMwaist 28 in, hip 39.5 inUS numeric 6-8
Lwaist 31 in, hip 42 inM or LLwaist 30 in, hip 41.5 inUS numeric 8-10
XLwaist 33 in, hip 44 inL or XLXLwaist 32 in, hip 43.5 inUS numeric 10-12
XXLwaist 36 in, hip 46.5 inXXLXXLwaist 36 in, hip 47.7 inUS numeric 14-16
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

Gymshark to Sweaty Betty