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Athleta to lululemon leggings size

The short answer

Athleta XXS is lululemon 4 or 2 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 Athleta size read across to lululemon. Letter sizes on the left, US numeric on the right.
AthletaAthleta builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
XXSwaist 24.3 in, hip 34 in4 or 20waist 25 in, hip 35 inLetter XS
XSwaist 25.3 to 26.3 in, hip 35 to 36 in4 or 6not publishedwaist 25 in, hip 35 inLetter XS
Swaist 27.3 to 28.3 in, hip 37 to 38 in6 or 8not publishedwaist 27 in, hip 37 inLetter S
Mwaist 29.3 to 30.3 in, hip 39 to 40 in8 or 10not publishedwaist 29 in, hip 39 inLetter M
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 in12not publishedwaist 33 in, hip 43 inLetter XL
XLwaist 34.3 in, hip 44.5 in14 or 12not publishedwaist 35 in, hip 45 inLetter XXL
1Xwaist 38 to 40 in, hip 47.3 to 49.3 in16not publishedwaist 38 in, hip 47 innot published
2Xwaist 42 to 44.5 in, hip 51.3 to 53.8 in20not publishedwaist 43 in, hip 51 innot published
3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 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 Athleta