TrueToSize

Convert / Shoes

On to La Sportiva shoe size

The short answer

On 5.5 is La Sportiva 36 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 On size read across to La Sportiva. US women's sizes on the left, EU on the right.
OnOn builds it forLa Sportiva, by chartSame labelLa Sportiva builds it forLa Sportiva also prints
5foot length 22 cmnot madenot publishednot publishednot published
5.5foot length 22.5 cm36not publishednot publishedUS women's 5.5 · US men's 4.5
6foot length 23 cm37not publishednot publishedUS women's 6 · US men's 5
6.5foot length 23.5 cm37.5not publishednot publishedUS women's 6.5 · US men's 5.5
7foot length 24 cm38not publishednot publishedUS women's 7 · US men's 6
7.5foot length 24.5 cm38.5not publishednot publishedUS women's 7.5 · US men's 6.5
8foot length 25 cm39.5not publishednot publishedUS women's 8 · US men's 7
8.5foot length 25.5 cm40not publishednot publishedUS women's 8.5 · US men's 7.5
9foot length 26 cm40.5not publishednot publishedUS women's 9 · US men's 8
9.5foot length 26.5 cm41not publishednot publishedUS women's 9.5 · US men's 8.5
10foot length 27 cm42not publishednot publishedUS women's 10 · US men's 9
10.5foot length 27.5 cm42.5not publishednot publishedUS women's 10.5 · US men's 9.5
11foot length 28 cm43not publishednot publishedUS women's 11 · US men's 10
12foot length 29 cmnot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the La Sportiva 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

La Sportiva to On