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Saucony to Altra shoe size

The short answer

Saucony 12.5 is Altra 12 or 13 by the two brands' own charts. 1 of 18 Saucony sizes land on a different label at Altra.

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

Every Saucony size read across to Altra. US women's sizes on the left, US women's on the right.
SauconySaucony builds it forAltra, by chartSame labelAltra builds it forAltra also prints
4.5foot length 21 cm4.54.5foot length 21 cmUK 2.5 · EU 35
5foot length 21.5 cm55foot length 21.5 cmUK 3 · EU 35.5
5.5foot length 22 cm5.55.5foot length 22 cmUK 3.5 · EU 36
6foot length 22.5 cm66foot length 22.5 cmUK 4 · EU 37
6.5foot length 23 cm6.56.5foot length 23 cmUK 4.5 · EU 37.5
7foot length 23.5 cm77foot length 23.5 cmUK 5 · EU 38
7.5foot length 24 cm7.57.5foot length 24 cmUK 5.5 · EU 38.5
8foot length 24.5 cm88foot length 24.5 cmUK 6 · EU 39
8.5foot length 25 cm8.58.5foot length 25 cmUK 6.5 · EU 40
9foot length 25.5 cm99foot length 25.5 cmUK 7 · EU 40.5
9.5foot length 26 cm9.59.5foot length 26 cmUK 7.5 · EU 41
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
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 cm12 or 13not publishedfoot length 28.5 cmUK 10 · EU 44.5
13foot length 29.5 cm1313foot length 29.5 cmUK 11 · EU 46
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

Altra to Saucony