Sweaty Betty to Athleta leggings size

The short answer

Sweaty Betty L is Athleta M or L by the two brands' own charts. 3 of 6 Sweaty Betty sizes land on a different label at Athleta.

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

Every Sweaty Betty size read across to Athleta. Letter sizes on the left, Letter on the right.
Sweaty Betty	Sweaty Betty builds it for	Athleta, by chart	Same label	Athleta builds it for	Athleta also prints
XXS	waist 23 in, hip 34 in	not made	XXS	not published	not published
XS	waist 25 in, hip 36 in	XS	XS	waist 25.3 to 26.3 in, hip 35 to 36 in	US numeric 0-2
S	waist 27 in, hip 38 in	S	S	waist 27.3 to 28.3 in, hip 37 to 38 in	US numeric 4-6
M	waist 29 in, hip 40 in	M	M	waist 29.3 to 30.3 in, hip 39 to 40 in	US numeric 8-10
L	waist 31 in, hip 42 in	M or L	L	waist 29.3 to 30.3 in, hip 39 to 40 in	US numeric 8-10
XL	waist 33 in, hip 44 in	L	XL	waist 31.8 to 33.3 in, hip 41.5 to 43 in	US numeric 12-14
XXL	waist 36 in, hip 46.5 in	XL or 1X	not published	waist 34.3 in, hip 44.5 in	US numeric 16-18

Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Athleta 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

Sweaty Betty size guide, read on 2026-09-17. Sweaty Betty on TrueToSize
Athleta size guide, read on 2026-09-17. Athleta on TrueToSize

Athleta to Sweaty Betty