Merrell to Under Armour Shoe Size Conversion

Switching from Merrell to Under Armour? Merrell runs true to size and Under Armour runs small, so the size you order changes. Here's the full chart.

Reviewed by the 247Sizing teamLast updated: 12 August 2026

Under Armour runs 0.5 size larger than Merrell, so you may need to size down when switching.

Size down 0.5 moving to Under Armour

Under Armour runs larger — order half a size smaller than your Merrell size.

Find your Merrell size on the left, read across for Under Armour:

Merrell size	Under Armour size	UK	EU	Foot (cm)
6.5	7	5.5	37	23.5
6.5	7	5.5	37.5	23.9
7	7.5	6	38	24.3
7.5	8	6.5	38.5	24.7
8	8.5	7	39.5	25.1
8	8.5	7	40	25.5
8.5	9	7.5	41	25.9
9	9.5	8	41.5	26.3
9.5	10	8.5	42.5	26.7
10	10.5	9	43	27.1
10.5	11	9.5	43.5	27.5
11	11.5	10	44	27.9
11.5	12	10.5	44.5	28.3
12	12.5	11	45.5	28.7
12.5	13	11.5	46	29.1
13	13.5	12	47	29.5
13.5	14	12.5	47.5	29.9
14	14.5	13	48	30.3
14	14.5	13	48.5	30.7
14.5	15	13.5	49	31.1
15	15.5	14	49.5	31.5

⚠️ Fit varies by model. Merrell runs true to size with a roomy toe box; wide options exist. Under Armour tends to run about half a size small, especially in performance trainers.

Under Armour to Merrell → · Merrell chart · Under Armour chart · Brand finder

What is a Merrell 10.5 in Under Armour?

A Merrell 10.5 is about a Under Armour 11 — they share a foot length of roughly 27.5 cm (UK 9.5, EU 43.5).

Do Merrell and Under Armour fit the same?

Not quite — Under Armour runs about 0.5 size larger than Merrell.

ⓘ Affiliate links below. As an Amazon Associate we earn from qualifying purchases at no extra cost to you.

★ Top pick · Recommended on Amazon

Under Armour Shoes

Shop Under Armour in your converted size.

View on Amazon →

Recommended on Amazon

Merrell Shoes