Merrell to Karhu shoe size

The short answer

Merrell 11.5 is Karhu 11 or 12 by the two brands' own charts. 1 of 12 Merrell sizes land on a different label at Karhu.

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 Merrell size read across to Karhu. US women's sizes on the left, US women's on the right.
Merrell	Karhu, by chart	Same label	Karhu also prints
5	not made	not published	not published
5.5	not made	not published	not published
6	6	not published	UK 4 · EU 37
6.5	6.5	not published	UK 4.5 · EU 37.5
7	7	not published	UK 5 · EU 38
7.5	7.5	not published	UK 5.5 · EU 39
8	8	not published	UK 6 · EU 39.5
8.5	8.5	not published	UK 6.5 · EU 40
9	9	not published	UK 7 · EU 40.5
9.5	9.5	not published	UK 7.5 · EU 41.5
10	10	not published	UK 8 · EU 42
10.5	10.5	not published	UK 8.5 · EU 42.5
11	11	not published	UK 9 · EU 43
11.5	11 or 12	not published	UK 9 · EU 43

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. 2 sizes have no counterpart on the Karhu 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.

Open in the converter Add an item you own

Sources

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

Karhu to Merrell