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Lululemon to Aerie (OFFLINE) leggings size

The short answer

lululemon 12 is Aerie (OFFLINE) L or XL 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 Aerie (OFFLINE). US numeric sizes on the left, Letter on the right.
lululemonlululemon builds it forAerie (OFFLINE), by chartSame labelAerie (OFFLINE) builds it forAerie (OFFLINE) also prints
0waist 21 in, hip 32 innot madenot publishednot publishednot published
2waist 23 in, hip 33 inXXSXXSwaist 22.5 to 23.5 in, hip 32 to 33 inUS numeric 000-00
4waist 25 in, hip 35 inXSXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
6waist 27 in, hip 37 inSSwaist 26.5 to 27.5 in, hip 36 to 37 inUS numeric 4-6
8waist 29 in, hip 39 inMMwaist 28.5 to 29.5 in, hip 38 to 39 inUS numeric 8-10
10waist 31 in, hip 41 inLLwaist 31 to 32.5 in, hip 40.5 to 42 inUS numeric 12-14
12waist 33 in, hip 43 inL or XLXLwaist 31 to 32.5 in, hip 40.5 to 42 inUS numeric 12-14
14waist 35 in, hip 45 inXLXXLwaist 34 to 36 in, hip 43.5 to 45.5 inUS numeric 16-18
16waist 38 in, hip 47 inXXLnot publishedwaist 38 in, hip 47.5 inUS numeric 20
18waist 41 in, hip 49 innot madenot publishednot publishednot published
20waist 43 in, hip 51 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Aerie (OFFLINE) 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

Aerie (OFFLINE) to lululemon