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Under Armour to lululemon leggings size

The short answer

Under Armour XXS is lululemon 4 by the two brands' own charts.

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

On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Under Armour size read across to lululemon. Letter sizes on the left, US numeric on the right.
Under ArmourUnder Armour builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 in40waist 25 in, hip 35 inLetter XS
XSwaist 25.5 to 27 in, hip 34.5 to 36 in6 or 4not publishedwaist 27 in, hip 37 inLetter S
SMwaist 27 to 29 in, hip 36 to 38 in6 or 8not publishedwaist 27 in, hip 37 inLetter S
MDwaist 29 to 31 in, hip 38 to 40 in8 or 10not publishedwaist 29 in, hip 39 inLetter M
LGwaist 31 to 34 in, hip 40 to 43 in12not publishedwaist 33 in, hip 43 inLetter XL
XLwaist 34 to 37 in, hip 43 to 46 in1416waist 35 in, hip 45 inLetter XXL
XXLwaist 37 to 40 in, hip 46 to 49 in1618waist 38 in, hip 47 innot published
3XLwaist 40 to 43 in, hip 49 to 52 in1820waist 41 in, hip 49 innot published
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in18not publishedwaist 41 in, hip 49 innot published
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in20not publishedwaist 43 in, hip 51 innot 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. 1 sizes have no counterpart on the lululemon 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

lululemon to Under Armour