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Norda to Altra shoe size

The short answer

norda 6 is Altra 5.5 by the two brands' own charts. 11 of 11 norda 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 4 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 norda size read across to Altra. US women's sizes on the left, US women's on the right.
nordanorda builds it forAltra, by chartSame labelAltra builds it forAltra also prints
6foot length 22 cm5.56foot length 22 cmUK 3.5 · EU 36
6.5foot length 22.5 cm66.5foot length 22.5 cmUK 4 · EU 37
7foot length 23 cm6.57foot length 23 cmUK 4.5 · EU 37.5
7.5foot length 23.5 cm77.5foot length 23.5 cmUK 5 · EU 38
8foot length 24 cm7.58foot length 24 cmUK 5.5 · EU 38.5
8.5foot length 24.5 cm88.5foot length 24.5 cmUK 6 · EU 39
9foot length 25 cm8.59foot length 25 cmUK 6.5 · EU 40
9.5foot length 25.3 cm8.5 or 99.5foot length 25 cmUK 6.5 · EU 40
10foot length 25.8 cm9 or 9.510foot length 25.5 cmUK 7 · EU 40.5
10.5foot length 26.3 cm9.5 or 1010.5foot length 26 cmUK 7.5 · EU 41
11foot length 26.5 cm1011foot length 26.5 cmUK 8 · EU 42
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 norda