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Under Armour to Gymshark leggings size

The short answer

Under Armour SM is Gymshark S by the two brands' own charts. 4 of 7 Under Armour 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 Under Armour size read across to Gymshark. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXXS or XSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 25.5 to 27 in, hip 34.5 to 36 inXSXSwaist 26 in, hip 37.5 inUS numeric 4-6
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 28 in, hip 39.5 inUS numeric 6-8
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 30 in, hip 41.5 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 34 to 37 in, hip 43 to 46 inXXLXLwaist 36 in, hip 47.7 inUS numeric 14-16
XXLwaist 37 to 40 in, hip 46 to 49 inXXLXXLwaist 36 in, hip 47.7 inUS numeric 14-16
3XLwaist 40 to 43 in, hip 49 to 52 innot madenot publishednot publishednot published
1Xwaist 39 to 43.5 in, hip 47 to 50.5 innot madenot publishednot publishednot published
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 innot madenot publishednot publishednot published
3Xwaist 48.5 to 53 in, hip 54.5 to 58 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 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 Under Armour