Nike to Under Armour Shoe Size Conversion

Switching from Nike to Under Armour? Nike runs small and Under Armour runs small, so the size you order stays the same. Here's the full chart.

Reviewed by the 247Sizing teamLast updated: 12 August 2026

Because Nike and Under Armour share the same fit tendency, your size carries straight across: a Nike 9.5 is a Under Armour 9.5.

Nike and Under Armour run the same

Order the same number — a Nike 9.5 is a Under Armour 9.5.

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

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

⚠️ Fit varies by model. Nike tends to run about half a size small — most people size up half, and lifestyle models (Air Force 1, Blazer) run especially snug. Under Armour tends to run about half a size small, especially in performance trainers.

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

What is a Nike 10.5 in Under Armour?

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

Do Nike and Under Armour fit the same?

Roughly, yes — both run small, so the same number fits.

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