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Beyond Yoga to Under Armour leggings size

The short answer

Beyond Yoga S is Under Armour SM by the two brands' own charts. 5 of 11 Beyond Yoga sizes land on a different label at Under Armour.

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

Every Beyond Yoga size read across to Under Armour. Letter sizes on the left, Letter on the right.
Beyond YogaBeyond Yoga builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 25 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 26 to 27.5 in, hip 35.5 to 37 inXSXSwaist 25.5 to 27 in, hip 34.5 to 36 inUS numeric 0-2
Swaist 28 to 29.5 in, hip 37.5 to 39 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 30 to 31.5 in, hip 39.5 to 41 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 32 to 33.5 in, hip 41.5 to 43 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 34 to 35.5 in, hip 43.5 to 45 inXLXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
XXLwaist 36 to 39.5 inXXLXXLwaist 37 to 40 in, hip 46 to 49 inUS numeric 18
1Xwaist 41 to 43 in, hip 50 to 52 in3XL1Xwaist 40 to 43 in, hip 49 to 52 inUS numeric 20
2Xwaist 44 to 47 in, hip 53 to 56 in2X2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
3Xwaist 48 to 51 in3X3Xwaist 48.5 to 53 in, hip 54.5 to 58 inUS numeric 24W-26W
4Xwaist 52 to 56 in3Xnot publishedwaist 48.5 to 53 in, hip 54.5 to 58 inUS numeric 24W-26W
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

Under Armour to Beyond Yoga