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ASICS to Saucony shoe size

The short answer

ASICS 4 is Saucony 5 by the two brands' own charts. 12 of 19 ASICS sizes land on a different label at Saucony.

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

On 2 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 ASICS size read across to Saucony. US women's sizes on the left, US women's on the right.
ASICSASICS builds it forSaucony, by chartSame labelSaucony builds it forSaucony also prints
4foot length 21.5 cm5not publishedfoot length 21.5 cmUS men's 3.5 · UK 2.5 · EU 35.5
4.5foot length 22 cm5.54.5foot length 22 cmUS men's 4 · UK 3 · EU 36
5foot length 22.5 cm65foot length 22.5 cmUS men's 4.5 · UK 3.5 · EU 37
5.5foot length 22.8 cm6 or 6.55.5foot length 22.5 cmUS men's 4.5 · UK 3.5 · EU 37
6foot length 23 cm6.56foot length 23 cmUS men's 5 · UK 4 · EU 37.5
6.5foot length 23.5 cm76.5foot length 23.5 cmUS men's 5.5 · UK 4.5 · EU 38
7foot length 24 cm7.57foot length 24 cmUS men's 6 · UK 5 · EU 38.5
7.5foot length 24.5 cm87.5foot length 24.5 cmUS men's 6.5 · UK 5.5 · EU 39
8foot length 25 cm8.58foot length 25 cmUS men's 7 · UK 6 · EU 40
8.5foot length 25.5 cm98.5foot length 25.5 cmUS men's 7.5 · UK 6.5 · EU 40.5
9foot length 25.8 cm9 or 9.59foot length 25.5 cmUS men's 7.5 · UK 6.5 · EU 40.5
9.5foot length 26 cm9.59.5foot length 26 cmUS men's 8 · UK 7 · EU 41
10foot length 26.5 cm1010foot length 26.5 cmUS men's 8.5 · UK 7.5 · EU 42
10.5foot length 27 cm10.510.5foot length 27 cmUS men's 9 · UK 8 · EU 42.5
11foot length 27.5 cm1111foot length 27.5 cmUS men's 9.5 · UK 8.5 · EU 43
11.5foot length 28 cm11.511.5foot length 28 cmUS men's 10 · UK 9 · EU 44
12foot length 28.5 cm1212foot length 28.5 cmUS men's 10.5 · UK 9.5 · EU 44.5
12.5foot length 28.8 cm12 or 12.512.5foot length 28.5 cmUS men's 10.5 · UK 9.5 · EU 44.5
13foot length 29 cm12.513foot length 29 cmUS men's 11 · UK 10 · EU 45
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

Saucony to ASICS