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.

A Merrell 9 works out to a Under Armour 9.5 — about half a size up. The chart below has every size.

Merrell → Under Armour: size up half a size

A Merrell 9 is a Under Armour 9.5.

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
7	7.5	6	38	24.3
7.5	8	6.5	38.5	24.7
8	8.5	7	39.5	25.1
8.5	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
14.5	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 9 in Under Armour?

A Merrell 9 is about a Under Armour 9.5 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).

Do Merrell and Under Armour fit the same?

No — Merrell runs true to size and Under Armour runs small, so size up half a size when you switch.

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