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Nike vs Under Armour shoe sizing

A Nike US 10 is about an Under Armour US 9 (EU 42.5) in men's sizes. Under Armour fits about 1.5 sizes bigger at the same printed size, so expect to take about 1.5 sizes down in Under Armour, based on both brands' official size charts.

Matched by foot length from both brands' published size charts · Updated July 2026

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Convert your Nike size to Under Armour

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Nike to Under Armour size chart

Each row matches by foot length, the key both brands print their charts in. Sizes outside either brand's published range are not shown.

Men's

Men's: Nike to Under Armour shoe size conversion with foot length
Nike US	Foot (cm)	Under Armour US	Under Armour EU
7.5	25.0	7	40
8	25.4	7.5	40.5
8.5	25.8	8	41
9	26.2	8	41
9.5	26.7	8.5	42
10	27.1	9	42.5
10.5	27.5	9.5	43
11	27.9	10	44
11.5	28.3	10.5	44.5
12	28.8	11	45
12.5	29.2	11	45
13	29.6	11.5	45.5
13.5	30.0	12	46
14	30.5	12.5	47
14.5	30.9	13	47.5
15	31.3	13.5	48
15.5	31.7	13.5	48
16	32.2	14	48.5
16.5	32.6	14.5	49
17	33.0	15	49.5
17.5	33.4	15.5	50
18	33.9	16	50.5

Women's

Women's: Nike to Under Armour shoe size conversion with foot length
Nike US	Foot (cm)	Under Armour US	Under Armour EU
5	22.1	5	35.5
5.5	22.4	5.5	36
6	22.9	6	36.5
6.5	23.3	6.5	37.5
7	23.7	6.5	37.5
7.5	24.1	7	38
8	24.6	7.5	38.5
8.5	24.9	8	39
9	25.4	8.5	40
9.5	25.9	9	40.5
10	26.2	9	40.5
10.5	26.7	9.5	41
11	27.1	10	42
11.5	27.5	10.5	42.5
12	27.9	11	43

Fit varies by model

Nike

Of 210 tracked Nike models, 27 run large. The rest fit true to the chart. The table above is the brand's standard chart, so check the model before sizing.

Nike vs Under Armour: common questions

Does Under Armour run bigger or smaller than Nike?

Under Armour runs about 1.5 sizes bigger than Nike: the same foot takes a lower number in Under Armour, consistently across the size range. For example, a Nike US 10 maps to an Under Armour US 9.

Can I buy Under Armour in my Nike size?

No. The number on the box means a different foot length in each brand, which is why a straight size-for-size swap misfits. Use the table above or the converter to translate properly.

How do I convert my Nike size to Under Armour?

Find your Nike size in the table above and read across, or use the converter with your exact size. The most reliable method is your measured foot length in centimeters: both brands publish their charts against it, so it translates without guesswork. Half sizes round to the nearest size the brand actually makes.

More brand conversions

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Brand size charts: Nike size chart · Under Armour size chart

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