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Lululemon to Zella leggings size

The short answer

lululemon 12 is Zella 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 Zella. US numeric sizes on the left, Letter on the right.
lululemonlululemon builds it forZella, by chartSame labelZella builds it forZella 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 34.5 to 35.5 inUS numeric 0-2
6waist 27 in, hip 37 inSSwaist 27 to 28 in, hip 36.5 to 37.5 inUS numeric 4-6
8waist 29 in, hip 39 inMMwaist 29 to 30 in, hip 38.5 to 39.5 inUS numeric 8-10
10waist 31 in, hip 41 inL or MLwaist 31.5 to 33.5 in, hip 41.5 to 43.5 inUS numeric 12-14
12waist 33 in, hip 43 inLXLwaist 31.5 to 33.5 in, hip 41.5 to 43.5 inUS numeric 12-14
14waist 35 in, hip 45 inXLXXLwaist 35.5 in, hip 45.5 inUS numeric 16
16waist 38 in, hip 47 inXXLnot publishedwaist 38 in, hip 48.5 inUS numeric 18
18waist 41 in, hip 49 in2Xnot publishedwaist 40.5 in, hip 51 inUS numeric 20
20waist 43 in, hip 51 in3Xnot publishedwaist 43 to 45 in, hip 53.3 to 55.5 inUS numeric 22-24
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Zella 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

Zella to lululemon