Altra Size & Fit Guide
True to size in length · Roomy FootShape™ toe box · Coming from casual sneakers? Consider ½–1 size up
Find your Altra size with Altra’s official men’s and women’s chart by foot length — or stop in for a Brannock fitting at our Kettering, Ohio store.
How it fits
Altra says its shoes generally run true to size in length, and width is true to size too.
Altra shoes have a roomier toe box than many running brands, thanks to their FootShapeâ„¢ fit.
If you’re used to wearing casual sneakers, Altra suggests considering going up a half size or even a full size in their running shoes, to allow room for your feet to expand.
Fit check: standing, press your thumb on the front of the shoe — there should be about a thumb’s width between your longest toe and the end of the shoe.
Between sizes
Between sizes? Size up if you wear thick socks or orthotics, or you're on your feet all day. Choose the smaller size if you like a snug, athletic fit.
Widths
| Width | What we carry |
|---|---|
| Standard | Most styles |
| Wide | Select styles, such as the Torin and Paradigm |
Women
| US | UK | EU | Foot length (cm) | Foot length (in) |
|---|---|---|---|---|
| 4 | 2 | 34.5 | 20.5 | 8.07" |
| 4½ | 2½ | 35 | 21 | 8.27" |
| 5 | 3 | 35.5 | 21.5 | 8.46" |
| 5½ | 3½ | 36 | 22 | 8.66" |
| 6 | 4 | 37 | 22.5 | 8.86" |
| 6½ | 4½ | 37.5 | 23 | 9.06" |
| 7 | 5 | 38 | 23.5 | 9.25" |
| 7½ | 5½ | 38.5 | 24 | 9.45" |
| 8 | 6 | 39 | 24.5 | 9.65" |
| 8½ | 6½ | 40 | 25 | 9.84" |
| 9 | 7 | 40.5 | 25.5 | 10.04" |
| 9½ | 7½ | 41 | 26 | 10.24" |
| 10 | 8 | 42 | 26.5 | 10.43" |
| 10½ | 8½ | 42.5 | 27 | 10.63" |
| 11 | 9 | 43 | 27.5 | 10.83" |
| 11½ | 9½ | 44 | 28 | 11.02" |
| 12 | 10 | 44.5 | 28.5 | 11.22" |
| 13 | 11 | 46 | 29.5 | 11.61" |
Men
| US | UK | EU | Foot length (cm) | Foot length (in) |
|---|---|---|---|---|
| 4 | 3 | 37 | 22 | 8.66" |
| 4½ | 3½ | 37.5 | 22.5 | 8.86" |
| 5 | 4 | 38 | 23 | 9.06" |
| 5½ | 4½ | 38.5 | 23.5 | 9.25" |
| 6 | 5 | 39 | 24 | 9.45" |
| 6½ | 5½ | 39.5 | 24.5 | 9.65" |
| 7 | 6 | 40 | 25 | 9.84" |
| 7½ | 6½ | 40.5 | 25.5 | 10.04" |
| 8 | 7 | 41 | 26 | 10.24" |
| 8½ | 7½ | 42 | 26.5 | 10.43" |
| 9 | 8 | 42.5 | 27 | 10.63" |
| 9½ | 8½ | 43 | 27.5 | 10.83" |
| 10 | 9 | 44 | 28 | 11.02" |
| 10½ | 9½ | 44.5 | 28.5 | 11.22" |
| 11 | 10 | 45 | 29 | 11.42" |
| 11½ | 10½ | 46 | 29.5 | 11.61" |
| 12 | 11 | 46.5 | 30 | 11.81" |
| 12½ | 11½ | 47 | 30.5 | 12.01" |
| 13 | 12 | 48 | 31 | 12.20" |
| 14 | 13 | 49 | 32 | 12.60" |
| 15 | 14 | 50 | 33 | 12.99" |
| 16 | 15 | 51.5 | 34 | 13.39" |
Centimeters are Altra’s; inches are converted.
How to measure
- Stand on a sheet of paper, with your weight on that foot.
- Mark the back of your heel and the tip of your longest toe.
- Measure between the marks in inches or centimeters.
- Measure both feet and use the longer one.
- Measure later in the day, when feet are at their largest, wearing the socks you’ll wear with the shoes.
Need help? We measure every customer with a Brannock device at our Kettering store. Stop in for a fitting, or call us at 937.298.1801 and we’ll help you choose. Ready to shop? Shop all Altra →
Source: Altra size chart and fit guidance (altrarunning.com) · Last checked October 2026