Under Armour to New Balance Shoe Size Conversion

Switching from Under Armour to New Balance? Under Armour runs small and New Balance runs true to size, 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 New Balance, so you may need to size down when switching.

Size up 0.5 moving to New Balance

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

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

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

⚠️ Fit varies by model. Under Armour tends to run about half a size small, especially in performance trainers. New Balance runs true to size and is one of the best brands for width options (2A to 4E).

New Balance to Under Armour → · Under Armour chart · New Balance chart · Brand finder

What is a Under Armour 10.5 in New Balance?

A Under Armour 10.5 is about a New Balance 10 — they share a foot length of roughly 27.5 cm (UK 9.5, EU 43.5).

Do Under Armour and New Balance fit the same?

Not quite — New Balance runs about 0.5 size smaller than Under Armour.

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