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Decathlon to lululemon leggings size

The short answer

Decathlon M is lululemon 10 or 8 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 Decathlon size read across to lululemon. Letter sizes on the left, US numeric on the right.
DecathlonDecathlon builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 in4 or 2not publishedwaist 25 in, hip 35 inLetter XS
XSwaist 25.2 to 26.8 in, hip 33.5 to 35.4 in4 or 6not publishedwaist 25 in, hip 35 inLetter XS
Swaist 27.2 to 28.7 in, hip 35.4 to 37.8 in6 or 8not publishedwaist 27 in, hip 37 inLetter S
Mwaist 29.1 to 31.1 in, hip 37.8 to 40.2 in10 or 8not publishedwaist 31 in, hip 41 inLetter L
Lwaist 31.5 to 33.9 in, hip 40.2 to 42.5 in12not publishedwaist 33 in, hip 43 inLetter XL
XLwaist 34.3 to 36.6 in, hip 42.5 to 44.9 in14not publishedwaist 35 in, hip 45 inLetter XXL
2XLwaist 37 to 39.4 in, hip 44.9 to 47.2 in16not publishedwaist 38 in, hip 47 innot published
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

lululemon to Decathlon