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Lululemon to Under Armour size

The short answer

lululemon XS is Under Armour SM by the two brands' own charts. 9 of 9 lululemon sizes land on a different label at Under Armour.

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

Every lululemon size read across to Under Armour. Letter sizes on the left, Letter on the right.
lululemonlululemon builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XSchest 35 to 36 inSMXSchest 34 to 37 in, waist 29 to 31 innot published
Schest 37 to 38 inMDnot publishedchest 37 to 41 in, waist 31 to 34 innot published
Mchest 39 to 40 inMDnot publishedchest 37 to 41 in, waist 31 to 34 innot published
Lchest 41 to 42 inLGnot publishedchest 41 to 44 in, waist 34 to 37 innot published
XLchest 43 to 45 inLGXLchest 41 to 44 in, waist 34 to 37 innot published
XXLchest 46 to 48 inXLXXLchest 44 to 48 in, waist 37 to 41 innot published
3XLchest 50 to 52 inXXL3XLchest 48 to 52 in, waist 41 to 45.5 innot published
4XLchest 53 to 55 in3XL4XLchest 52 to 56 in, waist 45.5 to 50 innot published
5XLchest 56 to 58 in4XL5XLchest 56 to 60 in, waist 50 to 54.5 innot published
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, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

Under Armour to lululemon