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La Sportiva to norda shoe size

The short answer

La Sportiva 40 is norda 8.5 by the two brands' own charts.

At least one of the two brands publishes no foot length, so the rows line up the US size both charts print. Treat it as the label conversion, not a fit.

Every La Sportiva size read across to norda. EU sizes on the left, US women's on the right.
La SportivaLa Sportiva builds it fornorda, by chartSame labelnorda builds it fornorda also prints
36not publishednot madenot publishednot publishednot published
36.5not published6not publishedfoot length 22 cmUK 3.5 · EU 36 · CM / JP 23
37not published6not publishedfoot length 22 cmUK 3.5 · EU 36 · CM / JP 23
37.5not published6.5not publishedfoot length 22.5 cmUK 4 · EU 36 2/3 · CM / JP 23.5
38not published7not publishedfoot length 23 cmUK 4.5 · EU 37 1/3 · CM / JP 24
38.5not published7.5not publishedfoot length 23.5 cmUK 5 · EU 38 · CM / JP 24.5
39not published7.5 or 8not publishedfoot length 23.5 cmUK 5 · EU 38 · CM / JP 24.5
39.5not published8not publishedfoot length 24 cmUK 5.5 · EU 38 2/3 · CM / JP 25
40not published8.5not publishedfoot length 24.5 cmUK 6 · EU 39 1/3 · CM / JP 25.25
40.5not published9not publishedfoot length 25 cmUK 6.5 · EU 40 · CM / JP 25.5
41not published9.5not publishedfoot length 25.3 cmUK 7 · EU 40 2/3 · CM / JP 26
41.5not published9.5 or 10not publishedfoot length 25.3 cmUK 7 · EU 40 2/3 · CM / JP 26
42not published10not publishedfoot length 25.8 cmUK 7.5 · EU 41 1/3 · CM / JP 26.5
42.5not published10.5not publishedfoot length 26.3 cmUK 8 · EU 42 · CM / JP 27
43not published11not publishedfoot length 26.5 cmUK 8.5 · EU 42 2/3 · CM / JP 27.5
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the norda 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

norda to La Sportiva