Decathlon to Spanx leggings size

The short answer

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

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 Spanx. Letter sizes on the left, Letter on the right.
Decathlon	Decathlon builds it for	Spanx, by chart	Same label	Spanx builds it for	Spanx also prints
2XS	waist 23.6 to 24.8 in, hip 31.1 to 33.5 in	XS	not published	waist 25 to 27 in, hip 34 to 36 in	US numeric 0-2
XS	waist 25.2 to 26.8 in, hip 33.5 to 35.4 in	XS	XS	waist 25 to 27 in, hip 34 to 36 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 29 in, hip 36 to 38 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 31 in, hip 38 to 40 in	US numeric 8-10
L	waist 31.5 to 33.9 in, hip 40.2 to 42.5 in	L	L	waist 31 to 33.5 in, hip 40 to 42.5 in	US numeric 12-14
XL	waist 34.3 to 36.6 in, hip 42.5 to 44.9 in	XL	XL	waist 33.5 to 36 in, hip 42.5 to 45 in	US numeric 16
2XL	waist 37 to 39.4 in, hip 44.9 to 47.2 in	1X	not published	waist 36 to 39 in, hip 45 to 48 in	US numeric 18-20

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.

Open in the converter Add an item you own

Sources

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

Spanx to Decathlon