ASICS to Mizuno men's shoe size

The short answer

ASICS 13.5 is Mizuno 13 or 14 by the two brands' own charts. 1 of 19 ASICS sizes land on a different label at Mizuno.

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 Mizuno. US men's sizes on the left, US men's on the right.
ASICS	ASICS builds it for	Mizuno, by chart	Same label	Mizuno builds it for	Mizuno also prints
4	not published	not made	not published	not published	not published
5	not published	5	not published	not published	US women's 6.5 · UK 4 · EU 36.5 · CM / JP 23
5.5	not published	5.5	not published	not published	US women's 7 · UK 4.5 · EU 37 · CM / JP 23.5
6	not published	6	not published	not published	US women's 7.5 · UK 5 · EU 38 · CM / JP 24
6.5	not published	6.5	not published	not published	US women's 8 · UK 5.5 · EU 38.5 · CM / JP 24.5
7	not published	7	not published	not published	US women's 8.5 · UK 6 · EU 39 · CM / JP 25
7.5	not published	7.5	not published	not published	US women's 9 · UK 6.5 · EU 40 · CM / JP 25.5
8	not published	8	not published	not published	US women's 9.5 · UK 7 · EU 40.5 · CM / JP 26
8.5	not published	8.5	not published	not published	US women's 10 · UK 7.5 · EU 41 · CM / JP 26.5
9	not published	9	not published	not published	US women's 10.5 · UK 8 · EU 42 · CM / JP 27
9.5	not published	9.5	not published	not published	US women's 11 · UK 8.5 · EU 42.5 · CM / JP 27.5
10	not published	10	not published	not published	US women's 11.5 · UK 9 · EU 43 · CM / JP 28
10.5	not published	10.5	not published	not published	US women's 12 · UK 9.5 · EU 44 · CM / JP 28.5
11	not published	11	not published	not published	US women's 12.5 · UK 10 · EU 44.5 · CM / JP 29
11.5	not published	11.5	not published	not published	US women's 13 · UK 10.5 · EU 45 · CM / JP 29.5
12	not published	12	not published	not published	US women's 13.5 · UK 11 · EU 46 · CM / JP 30
12.5	not published	12.5	not published	not published	US women's 14 · UK 11.5 · EU 46.5 · CM / JP 30.5
13	not published	13	not published	not published	US women's 14.5 · UK 12 · EU 47 · CM / JP 31
13.5	not published	13 or 14	not published	not published	US women's 14.5 · UK 12 · EU 47 · CM / JP 31
14	not published	14	not published	not published	US women's 15.5 · UK 13 · EU 48.5 · CM / JP 32
15	not published	not made	not published	not published	not published
16	not published	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Mizuno 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

ASICS size guide, read on 2026-09-18. ASICS on TrueToSize
Mizuno size guide, read on 2026-09-18. Mizuno on TrueToSize

Mizuno to ASICS