New Balance to Under Armour Shoe Size Conversion

Switching from New Balance to Under Armour? New Balance 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 New Balance, 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 New Balance size.

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

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

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

What is a New Balance 10.5 in Under Armour?

A New Balance 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 New Balance and Under Armour fit the same?

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

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