Under Armour to New Balance shoe size
The short answer
Under Armour 5 is New Balance 5.5 by the two brands' own charts. 13 of 15 Under Armour sizes land on a different label at New Balance.
Both brands publish the foot length each size is built for, so every row matches a foot, not a label.
| Under Armour | Under Armour builds it for | New Balance, by chart | Same label | New Balance builds it for | New Balance also prints |
|---|---|---|---|---|---|
| 5 | foot length 22.5 cm | 5.5 | 5 | foot length 22.5 cm | US men's 4 · UK 3.5 · EU 36 |
| 5.5 | foot length 23 cm | 6 | 5.5 | foot length 23 cm | US men's 4.5 · UK 4 · EU 36.5 |
| 6 | foot length 23.5 cm | 6.5 | 6 | foot length 23.5 cm | US men's 5 · UK 4.5 · EU 37 |
| 6.5 | foot length 23.5 cm | 6.5 | 6.5 | foot length 23.5 cm | US men's 5 · UK 4.5 · EU 37 |
| 7 | foot length 24 cm | 7 | 7 | foot length 24 cm | US men's 5.5 · UK 5 · EU 37.5 |
| 7.5 | foot length 24 cm | 7 | 7.5 | foot length 24 cm | US men's 5.5 · UK 5 · EU 37.5 |
| 8 | foot length 24.5 cm | 7.5 | 8 | foot length 24.5 cm | US men's 6 · UK 5.5 · EU 38 |
| 8.5 | foot length 25 cm | 8 | 8.5 | foot length 25 cm | US men's 6.5 · UK 6 · EU 39 |
| 9 | foot length 25.5 cm | 8.5 | 9 | foot length 25.5 cm | US men's 7 · UK 6.5 · EU 40 |
| 9.5 | foot length 26 cm | 9 | 9.5 | foot length 26 cm | US men's 7.5 · UK 7 · EU 40.5 |
| 10 | foot length 26.5 cm | 9.5 | 10 | foot length 26.5 cm | US men's 8 · UK 7.5 · EU 41 |
| 10.5 | foot length 27 cm | 10 | 10.5 | foot length 27 cm | US men's 8.5 · UK 8 · EU 41.5 |
| 11 | foot length 27.5 cm | 10.5 | 11 | foot length 27.5 cm | US men's 9 · UK 8.5 · EU 42.5 |
| 11.5 | foot length 28 cm | 11 | 11.5 | foot length 28 cm | US men's 9.5 · UK 9 · EU 43 |
| 12 | foot length 28.5 cm | 11.5 | 12 | foot length 28.5 cm | US men's 10 · UK 9.5 · EU 43.5 |
What wearers say
Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.
Sources
- Under Armour size guide, read on 2026-09-18. Under Armour on TrueToSize
- New Balance size guide, read on 2026-09-17. New Balance on TrueToSize