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ASICS to 361° men's shoe size

The short answer

ASICS 5.5 is 361° 5 or 6 by the two brands' own charts. 2 of 21 ASICS sizes land on a different label at 361°.

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 ASICS size read across to 361°. US men's sizes on the left, US men's on the right.
ASICS361°, by chartSame label361° also prints
44not publishedUS women's 5.5 · UK 3.5 · EU 36 · CM / JP 23
55not publishedUS women's 6.5 · UK 4 · EU 37.5 · CM / JP 23.5
5.55 or 6not publishedUS women's 6.5 · UK 4 · EU 37.5 · CM / JP 23.5
66not publishedUS women's 7.5 · UK 5 · EU 38.5 · CM / JP 24
6.56.5not publishedUS women's 8 · UK 5.5 · EU 39 · CM / JP 24.5
77not publishedUS women's 8.5 · UK 6 · EU 40 · CM / JP 25
7.57.5not publishedUS women's 9 · UK 6.5 · EU 40.5 · CM / JP 25.5
88not publishedUS women's 9.5 · UK 7 · EU 41 · CM / JP 26
8.58.5not publishedUS women's 10 · UK 7.5 · EU 42 · CM / JP 26.5
99not publishedUS women's 10.5 · UK 8 · EU 42.5 · CM / JP 27
9.59.5not publishedUS women's 11 · UK 8.5 · EU 43 · CM / JP 27.5
1010not publishedUS women's 11.5 · UK 9 · EU 44 · CM / JP 28
10.510.5not publishedUS women's 12 · UK 9.5 · EU 44.5 · CM / JP 28.5
1111not publishedUS women's 12.5 · UK 10 · EU 45 · CM / JP 29
11.511.5not publishedUS women's 13 · UK 10.5 · EU 45.5 · CM / JP 29.5
1212not publishedUS women's 13.5 · UK 11 · EU 46 · CM / JP 29.5
12.512.5not publishedUS women's 14 · UK 11.5 · EU 47 · CM / JP 30
1313not publishedUS women's 14.5 · UK 12 · EU 47.5 · CM / JP 30.5
13.513 or 14not publishedUS women's 14.5 · UK 12 · EU 47.5 · CM / JP 30.5
1414not publishedUS women's 15.5 · UK 13 · EU 48.5 · CM / JP 31.5
1515not publishedUS women's 16.5 · UK 14 · EU 49.5 · CM / JP 32.5
16not madenot publishednot published
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. 1 sizes have no counterpart on the 361° chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

361° to ASICS