Uniqlo to Gymshark leggings size

The short answer

Uniqlo S is Gymshark XS or S by the two brands' own charts. 3 of 7 Uniqlo sizes land on a different label at Gymshark.

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

Every Uniqlo size read across to Gymshark. Letter sizes on the left, Letter on the right.
Uniqlo	Uniqlo builds it for	Gymshark, by chart	Same label	Gymshark builds it for	Gymshark also prints
XXS	waist 22.5 to 24.8 in, hip 32.8 to 35 in	XXS	XXS	waist 24 in, hip 35.5 in	US numeric 2-4
XS	waist 24 to 26.5 in, hip 34.3 to 36.5 in	XS or XXS	XS	waist 26 in, hip 37.5 in	US numeric 4-6
S	waist 25.5 to 28 in, hip 35.8 to 38.3 in	XS or S	S	waist 26 in, hip 37.5 in	US numeric 4-6
M	waist 27.3 to 29.5 in, hip 37.5 to 39.8 in	S	M	waist 28 in, hip 39.5 in	US numeric 6-8
L	waist 29.5 to 32 in, hip 39.8 to 42.3 in	M or L	L	waist 30 in, hip 41.5 in	US numeric 8-10
XL	waist 32 to 34.3 in, hip 42.3 to 44.5 in	XL or L	XL	waist 34 in, hip 45.5 in	US numeric 12-14
XXL	waist 34.3 to 36.5 in, hip 44.5 to 46.8 in	XXL	XXL	waist 36 in, hip 47.7 in	US numeric 14-16

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

Uniqlo size guide, read on 2026-09-18. Uniqlo on TrueToSize
Gymshark size guide, read on 2026-09-17. Gymshark on TrueToSize

Gymshark to Uniqlo