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Nike to Saucony shoe size

The short answer

Nike 5 is Saucony 5.5 by the two brands' own charts. 16 of 16 Nike 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.

Every Nike size read across to Saucony. US women's sizes on the left, US women's on the right.
NikeNike builds it forSaucony, by chartSame labelSaucony builds it forSaucony also prints
5foot length 22 cm5.55foot length 22 cmUS men's 4 · UK 3 · EU 36
5.5foot length 22.5 cm65.5foot 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 26 cm9.59foot length 26 cmUS men's 8 · UK 7 · EU 41
9.5foot length 26.5 cm109.5foot length 26.5 cmUS men's 8.5 · UK 7.5 · EU 42
10foot length 27 cm10.510foot length 27 cmUS men's 9 · UK 8 · EU 42.5
10.5foot length 27.5 cm1110.5foot length 27.5 cmUS men's 9.5 · UK 8.5 · EU 43
11foot length 28 cm11.511foot length 28 cmUS men's 10 · UK 9 · EU 44
11.5foot length 28.5 cm1211.5foot length 28.5 cmUS men's 10.5 · UK 9.5 · EU 44.5
12foot length 29 cm12.512foot length 29 cmUS men's 11 · UK 10 · EU 45
12.5foot length 29.5 cm1312.5foot length 29.5 cmUS men's 11.5 · UK 10.5 · EU 46
13foot length 30 cmnot made13not publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Saucony 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

Saucony to Nike