Altra is an American brand that runs relatively small. If you are in doubt, you can also look at the US size in your current shoes to compare.
For the most accurate measurement, make sure to measure your feet at the end of the day as they can swell towards the end of the day.
Size chart Altra Men and Women
CM | EU | UK | US | UK | US |
M/F | M | M | Q | Q | |
22 | 36 | 3.5 | 5.5 | ||
22.5 | 37 | 4 | 6 | ||
23 | 37.5 | 4.5 | 6.5 | ||
23.5 | 38 | 5 | 7 | ||
24 | 38.5 | 5.5 | 7.5 | ||
24.5 | 39 | 6 | 8 | ||
25 | 40 | 6 | 7 | 6.5 | 8.5 |
25.5 | 40.5 | 6.5 | 7.5 | 7 | 9 |
26 | 41 | 7 | 8 | 7.5 | 9.5 |
26.5 | 42 | 7.5 | 8.5 | 8 | 10 |
27 | 42.5 | 8 | 9 | 8.5 | 10.5 |
27.5 | 43 | 8.5 | 9.5 | 9 | 11 |
28 | 44 | 9 | 10 | 9.5 | 11.5 |
28.5 | 44.5 | 9.5 | 10.5 | 10 | 12 |
29 | 45 | 10 | 11 | ||
29.5 | 46 | 10.5 | 11.5 | ||
30 | 46.5 | 11 | 12 | ||
30.5 | 47 | 11.5 | 12.5 | ||
31 | 48 | 12 | 13 | ||
32 | 49 | 13 | 14 | ||
33 | 50 | 14 | 15 | ||
34 | 51.5 | 15 | 16 |