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Old Navy to lululemon leggings size

The short answer

Old Navy XXS is lululemon 2 or 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.

Every Old Navy size read across to lululemon. Letter sizes on the left, US numeric on the right.
Old NavyOld Navy builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
XXSwaist 24 in, hip 34.5 in2 or 40waist 23 in, hip 33 inLetter XXS
XSwaist 25 to 26 in, hip 35.5 to 36.5 in4not publishedwaist 25 in, hip 35 inLetter XS
Swaist 27 to 28 in, hip 37.5 to 38.5 in6not publishedwaist 27 in, hip 37 inLetter S
Mwaist 29 to 30 in, hip 39.5 to 40.5 in8not publishedwaist 29 in, hip 39 inLetter M
Lwaist 31.5 to 33.5 in, hip 42 to 44 in12not publishedwaist 33 in, hip 43 inLetter XL
XLwaist 36.3 to 39 in, hip 46.5 to 49 in16not publishedwaist 38 in, hip 47 innot published
XXLwaist 42 in, hip 51.5 in18 or 2020waist 41 in, hip 49 innot published
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 in20not publishedwaist 43 in, hip 51 innot published
3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 innot madenot publishednot publishednot published
4Xwaist 51.5 to 54 in, hip 61 to 63.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 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 Old Navy