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La Sportiva to Brooks shoe size

The short answer

La Sportiva 39.5 is Brooks 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 Brooks. EU sizes on the left, US women's on the right.
La SportivaBrooks, by chartSame labelBrooks also prints
365.5not publishedUK 3.5 · EU 36
36.55.5 or 6not publishedUK 3.5 · EU 36
376not publishedUK 4 · EU 36.5
37.56.5not publishedUK 4.5 · EU 37.5
387not publishedUK 5 · EU 38
38.57.5not publishedUK 5.5 · EU 38.5
397.5 or 8not publishedUK 5.5 · EU 38.5
39.58not publishedUK 6 · EU 39
408.5not publishedUK 6.5 · EU 40
40.59not publishedUK 7 · EU 40.5
419.5not publishedUK 7.5 · EU 41
41.59.5 or 10not publishedUK 7.5 · EU 41
4210not publishedUK 8 · EU 42
42.510.5not publishedUK 8.5 · EU 42.5
4311not publishedUK 9 · EU 43
Neither chart publishes the body each size is built for, so the rows line up the labels. 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

Brooks to La Sportiva