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Lululemon to Old Navy leggings size

The short answer

lululemon 12 is Old Navy L 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 lululemon size read across to Old Navy. US numeric sizes on the left, Letter on the right.
lululemonlululemon builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
0waist 21 in, hip 32 innot madenot publishednot publishednot published
2waist 23 in, hip 33 innot madeXXSnot publishednot published
4waist 25 in, hip 35 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
6waist 27 in, hip 37 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
8waist 29 in, hip 39 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
10waist 31 in, hip 41 inL or MLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
12waist 33 in, hip 43 inLXLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
14waist 35 in, hip 45 inXL or LXXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
16waist 38 in, hip 47 inXLnot publishedwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
18waist 41 in, hip 49 inXXLnot publishedwaist 42 in, hip 51.5 inUS numeric 20
20waist 43 in, hip 51 in2Xnot publishedwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS numeric 20-22
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Old Navy 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

Old Navy to lululemon