Decathlon to Zella leggings size

The short answer

Decathlon 2XS is Zella XXS by the two brands' own charts. 2 of 7 Decathlon sizes land on a different label at Zella.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Decathlon size read across to Zella. Letter sizes on the left, Letter on the right.
Decathlon	Decathlon builds it for	Zella, by chart	Same label	Zella builds it for	Zella also prints
2XS	waist 23.6 to 24.8 in, hip 31.1 to 33.5 in	XXS	XXS	waist 24 in, hip 33.5 in	US numeric 00
XS	waist 25.2 to 26.8 in, hip 33.5 to 35.4 in	XS	XS	waist 25 to 26 in, hip 34.5 to 35.5 in	US numeric 0-2
S	waist 27.2 to 28.7 in, hip 35.4 to 37.8 in	S	S	waist 27 to 28 in, hip 36.5 to 37.5 in	US numeric 4-6
M	waist 29.1 to 31.1 in, hip 37.8 to 40.2 in	M	M	waist 29 to 30 in, hip 38.5 to 39.5 in	US numeric 8-10
L	waist 31.5 to 33.9 in, hip 40.2 to 42.5 in	L	L	waist 31.5 to 33.5 in, hip 41.5 to 43.5 in	US numeric 12-14
XL	waist 34.3 to 36.6 in, hip 42.5 to 44.9 in	XL	XL	waist 35.5 in, hip 45.5 in	US numeric 16
2XL	waist 37 to 39.4 in, hip 44.9 to 47.2 in	XXL	XXL	waist 38 in, hip 48.5 in	US numeric 18

Tinted rows change label or sit between two sizes. 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

Decathlon size guide, read on 2026-09-18.
Zella size guide, read on 2026-09-18. Zella on TrueToSize

Zella to Decathlon