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Onitsuka Tiger to ASICS men's shoe size

The short answer

Onitsuka Tiger 4.5 is ASICS 4 or 5 by the two brands' own charts. 1 of 21 Onitsuka Tiger sizes land on a different label at ASICS.

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 Onitsuka Tiger size read across to ASICS. US men's sizes on the left, US men's on the right.
Onitsuka TigerASICS, by chartSame labelASICS also prints
44not publishedUS women's 5.5 · UK 3 · EU 36 · CM / JP 22.5
4.54 or 5not publishedUS women's 5.5 · UK 3 · EU 36 · CM / JP 22.5
55not publishedUS women's 6.5 · UK 4 · EU 37.5 · CM / JP 23.5
5.55.5not publishedUS women's 7 · UK 4.5 · EU 38 · CM / JP 24
66not publishedUS women's 7.5 · UK 5 · EU 39 · CM / JP 24.5
6.56.5not publishedUS women's 8 · UK 5.5 · EU 39.5 · CM / JP 25
77not publishedUS women's 8.5 · UK 6 · EU 40 · CM / JP 25.5
7.57.5not publishedUS women's 9 · UK 6.5 · EU 40.5 · CM / JP 25.75
88not publishedUS women's 9.5 · UK 7 · EU 41.5 · 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 43.5 · 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 28.25
1111not publishedUS women's 12.5 · UK 10 · EU 45 · CM / JP 28.5
11.511.5not publishedUS women's 13 · UK 10.5 · EU 46 · CM / JP 29
1212not publishedUS women's 13.5 · UK 11 · EU 46.5 · 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 48 · CM / JP 30.5
13.513.5not publishedUS women's 15 · UK 12.5 · EU 48.5 · CM / JP 30.75
1414not publishedUS women's 15.5 · UK 13 · EU 49 · CM / JP 31
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, 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

ASICS to Onitsuka Tiger