Lululemon to AYBL leggings size

The short answer

lululemon 10 is AYBL M 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 AYBL. US numeric sizes on the left, Letter on the right.
lululemon	lululemon builds it for	AYBL, by chart	Same label	AYBL builds it for	AYBL also prints
0	waist 21 in, hip 32 in	not made	not published	not published	not published
2	waist 23 in, hip 33 in	XXS	XXS	waist 23 to 24 in, hip 33.5 to 35 in	not published
4	waist 25 in, hip 35 in	XS	XS	waist 24 to 26.5 in, hip 35 to 37 in	not published
6	waist 27 in, hip 37 in	S	S	waist 26.5 to 29 in, hip 37 to 39.5 in	not published
8	waist 29 in, hip 39 in	M	M	waist 29 to 31 in, hip 39.5 to 42 in	not published
10	waist 31 in, hip 41 in	M	L	waist 29 to 31 in, hip 39.5 to 42 in	not published
12	waist 33 in, hip 43 in	L	XL	waist 31 to 33.5 in, hip 42 to 44.5 in	not published
14	waist 35 in, hip 45 in	XL	XXL	waist 33.5 to 36 in, hip 44.5 to 46.5 in	not published
16	waist 38 in, hip 47 in	XXL	not published	waist 36 to 38.5 in, hip 46.5 to 49 in	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. 3 sizes have no counterpart on the AYBL 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
AYBL size guide, read on 2026-09-18.

AYBL to lululemon