Lululemon to Alphalete leggings size

The short answer

lululemon 2 is Alphalete 2XS 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 Alphalete. US numeric sizes on the left, Letter on the right.
lululemon	lululemon builds it for	Alphalete, by chart	Same label	Alphalete builds it for	Alphalete also prints
0	waist 21 in, hip 32 in	not made	not published	not published	not published
2	waist 23 in, hip 33 in	2XS	2XS	waist 23 to 24 in, hip 33 to 34 in	not published
4	waist 25 in, hip 35 in	XS	XS	waist 25 to 26 in, hip 35 to 36 in	not published
6	waist 27 in, hip 37 in	S	S	waist 27 to 28 in, hip 37 to 38 in	not published
8	waist 29 in, hip 39 in	M	M	waist 29 to 30 in, hip 39 to 40 in	not published
10	waist 31 in, hip 41 in	L	L	waist 31 to 32 in, hip 41 to 42 in	not published
12	waist 33 in, hip 43 in	XL	XL	waist 33 to 34 in, hip 43 to 44 in	not published
14	waist 35 in, hip 45 in	2XL	2XL	waist 35 to 36 in, hip 45 to 46 in	not published
16	waist 38 in, hip 47 in	not made	not published	not published	not published
18	waist 41 in, hip 49 in	not made	not published	not published	not published
20	waist 43 in, hip 51 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Alphalete 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 size guide, read on 2026-09-17. lululemon on TrueToSize
Alphalete size guide, read on 2026-09-18. Alphalete on TrueToSize

Alphalete to lululemon