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Clarks to Altra shoe size

The short answer

Clarks 5½ is Altra 5.5 by the two brands' own charts. 11 of 14 Clarks 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.

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 Clarks size read across to Altra. US women's sizes on the left, US women's on the right.
ClarksClarks builds it forAltra, by chartSame labelAltra builds it forAltra also prints
5foot length 21.6 cm55foot length 21.5 cmUK 3 · EU 35.5
5½foot length 22.1 cm5.55.5foot length 22 cmUK 3.5 · EU 36
6foot length 22.6 cm66foot length 22.5 cmUK 4 · EU 37
6½foot length 23.1 cm6.56.5foot length 23 cmUK 4.5 · EU 37.5
7foot length 23.6 cm77foot length 23.5 cmUK 5 · EU 38
7½foot length 23.9 cm7.57.5foot length 24 cmUK 5.5 · EU 38.5
8foot length 24.1 cm7.58foot length 24 cmUK 5.5 · EU 38.5
8½foot length 24.6 cm88.5foot length 24.5 cmUK 6 · EU 39
9foot length 25.1 cm8.59foot length 25 cmUK 6.5 · EU 40
9½foot length 25.4 cm99.5foot length 25.5 cmUK 7 · EU 40.5
10foot length 25.9 cm9.510foot length 26 cmUK 7.5 · EU 41
10½foot length 26.2 cm9.5 or 1010.5foot length 26 cmUK 7.5 · EU 41
11foot length 26.7 cm10 or 10.511foot length 26.5 cmUK 8 · EU 42
12foot length 27.7 cm11 or 11.512foot length 27.5 cmUK 9 · EU 43
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 Clarks