La Sportiva to New Balance shoe size

The short answer

La Sportiva 39.5 is New Balance 8 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 New Balance. EU sizes on the left, US women's on the right.
La Sportiva	La Sportiva builds it for	New Balance, by chart	Same label	New Balance builds it for	New Balance also prints
36	not published	5.5	not published	foot length 22.5 cm	US men's 4 · UK 3.5 · EU 36
36.5	not published	5.5 or 6	not published	foot length 22.5 cm	US men's 4 · UK 3.5 · EU 36
37	not published	6	not published	foot length 23 cm	US men's 4.5 · UK 4 · EU 36.5
37.5	not published	6.5	not published	foot length 23.5 cm	US men's 5 · UK 4.5 · EU 37
38	not published	7	not published	foot length 24 cm	US men's 5.5 · UK 5 · EU 37.5
38.5	not published	7.5	not published	foot length 24.5 cm	US men's 6 · UK 5.5 · EU 38
39	not published	7.5 or 8	not published	foot length 24.5 cm	US men's 6 · UK 5.5 · EU 38
39.5	not published	8	not published	foot length 25 cm	US men's 6.5 · UK 6 · EU 39
40	not published	8.5	not published	foot length 25.5 cm	US men's 7 · UK 6.5 · EU 40
40.5	not published	9	not published	foot length 26 cm	US men's 7.5 · UK 7 · EU 40.5
41	not published	9.5	not published	foot length 26.5 cm	US men's 8 · UK 7.5 · EU 41
41.5	not published	9.5 or 10	not published	foot length 26.5 cm	US men's 8 · UK 7.5 · EU 41
42	not published	10	not published	foot length 27 cm	US men's 8.5 · UK 8 · EU 41.5
42.5	not published	10.5	not published	foot length 27.5 cm	US men's 9 · UK 8.5 · EU 42.5
43	not published	11	not published	foot length 28 cm	US men's 9.5 · UK 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.

Open in the converter Add an item you own

Sources

La Sportiva size guide, read on 2026-09-17. La Sportiva on TrueToSize
New Balance size guide, read on 2026-09-17. New Balance on TrueToSize

New Balance to La Sportiva