Brooks to Under Armour Shoe Size Conversion

Switching from Brooks to Under Armour? Brooks 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 Brooks, 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 Brooks size.

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

Brooks 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. Brooks runs true to size with a generous toe box; multiple widths are offered. Under Armour tends to run about half a size small, especially in performance trainers.

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

What is a Brooks 10.5 in Under Armour?

A Brooks 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 Brooks and Under Armour fit the same?

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

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