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Onitsuka Tiger to Merrell shoe size

The short answer

Onitsuka Tiger 25.5 is Merrell 9 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 Onitsuka Tiger size read across to Merrell. CM / JP sizes on the left, US women's on the right.
Onitsuka TigerMerrell, by chartSame labelMerrell also prints
22not madenot publishednot published
22.55.5not publishedUS men's 4 · UK 3 · EU 35.5 · CM / JP 22.5
236not publishedUS men's 4.5 · UK 3.5 · EU 36 · CM / JP 23
23.56.5not publishedUS men's 5 · UK 4 · EU 37 · CM / JP 23.5
247not publishedUS men's 5.5 · UK 4.5 · EU 37.5 · CM / JP 24
24.57.5not publishedUS men's 6 · UK 5 · EU 38 · CM / JP 24.5
258not publishedUS men's 6.5 · UK 5.5 · EU 38.5 · CM / JP 25
25.59not publishedUS men's 7.5 · UK 6.5 · EU 40 · CM / JP 26
269.5not publishedUS men's 8 · UK 7 · EU 40.5 · CM / JP 26.5
26.510not publishedUS men's 8.5 · UK 7.5 · EU 41 · CM / JP 27
2710.5not publishedUS men's 9 · UK 8 · EU 42 · CM / JP 27.5
27.511not publishedUS men's 9.5 · UK 8.5 · EU 42.5 · CM / JP 28
2811.5not publishedUS men's 10 · UK 9 · EU 43 · CM / JP 28.5
28.5not madenot publishednot published
29not madenot publishednot published
29.5not madenot publishednot published
30not madenot publishednot published
30.5not 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. 6 sizes have no counterpart on the Merrell 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

Merrell to Onitsuka Tiger