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Lululemon to ASICS shoe size

The short answer

lululemon 5 is ASICS 4.5 by the two brands' own charts. 10 of 15 lululemon sizes land on a different label at ASICS.

Both brands publish the foot length each size is built for, so every row matches a foot, not a label.

Every lululemon size read across to ASICS. US women's sizes on the left, US women's on the right.
lululemonlululemon builds it forASICS, by chartSame labelASICS builds it forASICS also prints
5foot length 22 cm4.55foot length 22 cmUK 2.5 · EU 35
5.5foot length 22.5 cm55.5foot length 22.5 cmUK 3 · EU 35.5
6foot length 23 cm66foot length 23 cmUK 4 · EU 37
6.5foot length 23.5 cm6.56.5foot length 23.5 cmUK 4.5 · EU 37.5
7foot length 24 cm77foot length 24 cmUK 5 · EU 38
7.5foot length 24 cm77.5foot length 24 cmUK 5 · EU 38
8foot length 24.5 cm7.58foot length 24.5 cmUK 5.5 · EU 39
8.5foot length 25 cm88.5foot length 25 cmUK 6 · EU 39.5
9foot length 25.5 cm8.59foot length 25.5 cmUK 6.5 · EU 40
9.5foot length 26 cm9.59.5foot length 26 cmUK 7.5 · EU 41.5
10foot length 26.5 cm1010foot length 26.5 cmUK 8 · EU 42
10.5foot length 26.5 cm1010.5foot length 26.5 cmUK 8 · EU 42
11foot length 27 cm10.511foot length 27 cmUK 8.5 · EU 42.5
11.5foot length 27.5 cm1111.5foot length 27.5 cmUK 9 · EU 43.5
12foot length 28 cm11.512foot length 28 cmUK 9.5 · EU 44
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

ASICS to lululemon