Nike vs Under Armour shoe size
By the length each brand lists, Nike men's US 9 lines up with Under Armour US 9. All 19 men's sizes match the same US number.
Men's sizes
19 of 19 matched men's rows are the same US size. The median length difference is 0 mm on the size in cm scale. Every matched row lists the same length, so any difference below is in the size labels.
| Nike US | EU | UK | cm | Under Armour US | EU | UK | cm | Diff |
|---|---|---|---|---|---|---|---|---|
| 7 | 40 | 6 | 25 | 7 | 40 | 6 | 25 | 0 |
| 7.5 | 40.5 | 6.5 | 25.5 | 7.5 | 40.5 | 6.5 | 25.5 | 0 |
| 8 | 41 | 7 | 26 | 8 | 41 | 7 | 26 | 0 |
| 8.5 | 42 | 7.5 | 26.5 | 8.5 | 42 | 7.5 | 26.5 | 0 |
| 9 | 42.5 | 8 | 27 | 9 | 42.5 | 8 | 27 | 0 |
| 9.5 | 43 | 8.5 | 27.5 | 9.5 | 43 | 8.5 | 27.5 | 0 |
| 10 | 44 | 9 | 28 | 10 | 44 | 9 | 28 | 0 |
| 10.5 | 44.5 | 9.5 | 28.5 | 10.5 | 44.5 | 9.5 | 28.5 | 0 |
| 11 | 45 | 10 | 29 | 11 | 45 | 10 | 29 | 0 |
| 11.5 | 45.5 | 10.5 | 29.5 | 11.5 | 45.5 | 10.5 | 29.5 | 0 |
| 12 | 46 | 11 | 30 | 12 | 46 | 11 | 30 | 0 |
| 12.5 | 47 | 11.5 | 30.5 | 12.5 | 47 | 11.5 | 30.5 | 0 |
| 13 | 47.5 | 12 | 31 | 13 | 47.5 | 12 | 31 | 0 |
| 13.5 | 48 | 12.5 | 31.5 | 13.5 | 48 | 12.5 | 31.5 | 0 |
| 14 | 48.5 | 13 | 32 | 14 | 48.5 | 13 | 32 | 0 |
| 14.5 | 49 | 13.5 | 32.5 | 14.5 | 49 | 13.5 | 32.5 | 0 |
| 15 | 49.5 | 14 | 33 | 15 | 49.5 | 14 | 33 | 0 |
| 15.5 | 50 | 14.5 | 33.5 | 15.5 | 50 | 14.5 | 33.5 | 0 |
| 16 | 50.5 | 15 | 34 | 16 | 50.5 | 15 | 34 | 0 |
Sources: Nike, www.nike.com (checked 2026-10-24) · Under Armour, www.underarmour.com (checked 2026-10-24)
Women's sizes
1 of 13 matched women's rows are the same US size. The median length difference is 0 mm on the size in cm scale. Every matched row lists the same length, so any difference below is in the size labels.
| Nike US | EU | UK | cm | Under Armour US | EU | UK | cm | Diff |
|---|---|---|---|---|---|---|---|---|
| 5.5 | 36 | 3 | 22.5 | 5 | 35.5 | 3 | 22.5 | 0 |
| 6 | 36.5 | 3.5 | 23 | 5.5 | 36 | 3.5 | 23 | 0 |
| 6.5 | 37.5 | 4 | 23.5 | 6 | 36.5 | 4 | 23.5 | 0 |
| 7 | 38 | 4.5 | 24 | 7 | 38 | 5 | 24 | 0 |
| 7.5 | 38.5 | 5 | 24.5 | 8 | 39 | 6 | 24.5 | 0 |
| 8 | 39 | 5.5 | 25 | 8.5 | 40 | 6 | 25 | 0 |
| 8.5 | 40 | 6 | 25.5 | 9 | 40.5 | 6.5 | 25.5 | 0 |
| 9 | 40.5 | 6.5 | 26 | 9.5 | 41 | 7 | 26 | 0 |
| 9.5 | 41 | 7 | 26.5 | 10 | 42 | 7.5 | 26.5 | 0 |
| 10 | 42 | 7.5 | 27 | 10.5 | 42.5 | 8 | 27 | 0 |
| 10.5 | 42.5 | 8 | 27.5 | 11 | 43 | 8.5 | 27.5 | 0 |
| 11 | 43 | 8.5 | 28 | 11.5 | 44 | 9 | 28 | 0 |
| 11.5 | 44 | 9 | 28.5 | 12 | 44.5 | 9.5 | 28.5 | 0 |
Sources: Nike, www.nike.com (checked 2026-10-24) · Under Armour, www.underarmour.com (checked 2026-10-24)
Convert your exact size
What a chart comparison cannot tell you
Both tables come from brand-wide size charts. They do not capture the shape of a particular model, its width or how it wears. Check the fit notes on the Nike size chart and the Under Armour size chart before you buy.