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Saucony to ASICS shoe size

The short answer

Saucony 5 is ASICS 4 by the two brands' own charts. 10 of 16 Saucony 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.

On 3 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Saucony size read across to ASICS. US women's sizes on the left, US women's on the right.
SauconySaucony builds it forASICS, by chartSame labelASICS builds it forASICS also prints
4.5foot length 21 cmnot made4.5not publishednot published
5foot length 21.5 cm45foot length 21.5 cmUK 2 · EU 34.5
5.5foot length 22 cm4.55.5foot length 22 cmUK 2.5 · EU 35
6foot length 22.5 cm56foot length 22.5 cmUK 3 · EU 35.5
6.5foot length 23 cm66.5foot length 23 cmUK 4 · EU 37
7foot length 23.5 cm6.57foot length 23.5 cmUK 4.5 · EU 37.5
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 27 cm10.510.5foot length 27 cmUK 8.5 · EU 42.5
11foot length 27.5 cm1111foot length 27.5 cmUK 9 · EU 43.5
11.5foot length 28 cm11.511.5foot length 28 cmUK 9.5 · EU 44
12foot length 28.5 cm1212foot length 28.5 cmUK 10 · EU 44.5
12.5foot length 29 cm1312.5foot length 29 cmUK 11 · EU 46
13foot length 29.5 cmnot made13not publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the ASICS 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

ASICS to Saucony