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Altra to Clarks shoe size

The short answer

Altra 5.5 is Clarks 5½ by the two brands' own charts. 11 of 14 Altra sizes land on a different label at Clarks.

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

On 1 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 Altra size read across to Clarks. US women's sizes on the left, US women's on the right.
AltraAltra builds it forClarks, by chartSame labelClarks builds it forClarks also prints
4foot length 20.5 cmnot madenot publishednot publishednot published
4.5foot length 21 cmnot madenot publishednot publishednot published
5foot length 21.5 cm55foot length 21.6 cmUK 2.5
5.5foot length 22 cm5½5½foot length 22.1 cmUK 3
6foot length 22.5 cm66foot length 22.6 cmUK 3.5
6.5foot length 23 cm6½6½foot length 23.1 cmUK 4
7foot length 23.5 cm77foot length 23.6 cmUK 4.5
7.5foot length 24 cm7½7½foot length 23.9 cmUK 5
8foot length 24.5 cm8½8foot length 24.6 cmUK 6
8.5foot length 25 cm98½foot length 25.1 cmUK 6.5
9foot length 25.5 cm9½9foot length 25.4 cmUK 7
9.5foot length 26 cm109½foot length 25.9 cmUK 7.5
10foot length 26.5 cm11 or 10½10foot length 26.7 cmUK 8.5
10.5foot length 27 cm1110½foot length 26.7 cmUK 8.5
11foot length 27.5 cm1211foot length 27.7 cmUK 9.5
11.5foot length 28 cm12not publishedfoot length 27.7 cmUK 9.5
12foot length 28.5 cmnot made12not publishednot published
13foot length 29.5 cmnot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Clarks 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

Clarks to Altra