Adidas to Merrell shoe size

The short answer

adidas 8.5 is Merrell 8.5 by the two brands' own charts. 0 of 14 adidas sizes land on a different label at Merrell.

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 adidas size read across to Merrell. US women's sizes on the left, US women's on the right.
adidas	adidas builds it for	Merrell, by chart	Same label	Merrell builds it for	Merrell also prints
5	foot length 22.1 cm	5	not published	not published	US men's 3.5 · UK 2.5 · EU 35 · CM / JP 22
5.5	foot length 22.5 cm	5.5	not published	not published	US men's 4 · UK 3 · EU 35.5 · CM / JP 22.5
6	foot length 22.9 cm	6	not published	not published	US men's 4.5 · UK 3.5 · EU 36 · CM / JP 23
6.5	foot length 23.3 cm	6.5	not published	not published	US men's 5 · UK 4 · EU 37 · CM / JP 23.5
7	foot length 23.8 cm	7	not published	not published	US men's 5.5 · UK 4.5 · EU 37.5 · CM / JP 24
7.5	foot length 24.2 cm	7.5	not published	not published	US men's 6 · UK 5 · EU 38 · CM / JP 24.5
8	foot length 24.6 cm	8	not published	not published	US men's 6.5 · UK 5.5 · EU 38.5 · CM / JP 25
8.5	foot length 25 cm	8.5	not published	not published	US men's 7 · UK 6 · EU 39 · CM / JP 25.5
9	foot length 25.5 cm	9	not published	not published	US men's 7.5 · UK 6.5 · EU 40 · CM / JP 26
9.5	foot length 25.9 cm	9.5	not published	not published	US men's 8 · UK 7 · EU 40.5 · CM / JP 26.5
10	foot length 26.3 cm	10	not published	not published	US men's 8.5 · UK 7.5 · EU 41 · CM / JP 27
10.5	foot length 26.7 cm	10.5	not published	not published	US men's 9 · UK 8 · EU 42 · CM / JP 27.5
11	foot length 27.1 cm	11	not published	not published	US men's 9.5 · UK 8.5 · EU 42.5 · CM / JP 28
11.5	foot length 27.6 cm	11.5	not published	not published	US men's 10 · UK 9 · EU 43 · CM / JP 28.5
12	foot length 28 cm	not made	not published	not published	not published
12.5	foot length 28.4 cm	not made	not published	not published	not published
13	foot length 28.8 cm	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 3 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

adidas size guide, read on 2026-09-17. adidas on TrueToSize
Merrell size guide, read on 2026-09-18. Merrell on TrueToSize

Merrell to adidas