COMPLETE ALTRA SIZE GUIDE FOR MEN & WOMEN
Finding your perfect Altra fit starts here. Whether you’re lacing up for your first 5K or your next 50-miler, the Altra size chart takes the guesswork out of shopping. Our sizing guide covers both men’s and women’s running shoes (plus apparel), so you can find the right fit. Top to bottom.
To dial in your gear even further, use our TrueFit™ fit personalized finder to receive accurate size recommendations based on your foot shape, activity level and shoe history.
Do Altra shoes run true to size? To help you get it right, we get real runner insights and sizing comparisons. Before ordering, we recommend measuring your foot in centimeters, then cross-reference it with the chart below to convert your exact US, UK or EU shoe size.
MEN’S SHOES SIZE CHART
| U.S. | U.K. | E.U. | CM |
|---|---|---|---|
| 4 | 3 | 37 | 22 |
| 4.5 | 3.5 | 37.5 | 22.5 |
| 5 | 4 | 38 | 23 |
| 5.5 | 4.5 | 38.5 | 23.5 |
| 6 | 5 | 39 | 24 |
| 6.5 | 5.5 | 39.5 | 24.5 |
| 7 | 6 | 40 | 25 |
| 7.5 | 6.5 | 40.5 | 25.5 |
| 8 | 7 | 41 | 26 |
| 8.5 | 7.5 | 42 | 26.5 |
| 9 | 8 | 42.5 | 27 |
| 9.5 | 8.5 | 43 | 27.5 |
| 10 | 9 | 44 | 28 |
| 10.5 | 9.5 | 44.5 | 28.5 |
| 11 | 10 | 45 | 29 |
| 11.5 | 10.5 | 46 | 29.5 |
| 12 | 11 | 46.5 | 30 |
| 12.5 | 11.5 | 47 | 30.5 |
| 13 | 12 | 48 | 31 |
| 14 | 13 | 49 | 32 |
| 15 | 14 | 50 | 33 |
| 16 | 15 | 51.5 | 34 |
WOMEN’S SHOES SIZE CHART
| U.S. | U.K. | E.U. | CM |
|---|---|---|---|
| 4 | 2 | 34.5 | 20.5 |
| 4.5 | 2.5 | 35 | 21 |
| 5 | 3 | 35.5 | 21.5 |
| 5.5 | 3.5 | 36 | 22 |
| 6 | 4 | 37 | 22.5 |
| 6.5 | 4.5 | 37.5 | 23 |
| 7 | 5 | 38 | 23.5 |
| 7.5 | 5.5 | 38.5 | 24 |
| 8 | 6 | 39 | 24.5 |
| 8.5 | 6.5 | 40 | 25 |
| 9 | 7 | 40.5 | 25.5 |
| 9.5 | 7.5 | 41 | 26 |
| 10 | 8 | 42 | 26.5 |
| 10.5 | 8.5 | 42.5 | 27 |
| 11 | 9 | 43 | 27.5 |
| 11.5 | 9.5 | 44 | 28 |
| 12 | 10 | 44.5 | 28.5 |
| 13 | 11 | 46 | 29.5 |
MEN’S TOPS & OUTERWEAR
| Size | Chest | Hips | Long Sleeve Length |
|---|---|---|---|
| Small | 36–38 in | 35–37 in | 33.5 in |
| Medium | 39–41 in | 38–40 in | 34.0 in |
| Large | 42–44 in | 41–43 in | 34.8 in |
| X-Large | 45–48 in | 44–46 in | 35.5 in |
| 2X-Large | 49–52 in | 47–49 in | 36.3 in |
MEN’S BOTTOMS
| Size | Waist | Hip | Inseam |
|---|---|---|---|
| Small | 29–30 in | 35–36 in | 31.5 in |
| Medium | 31–34 in | 37–40 in | 32.0 in |
| Large | 35–38 in | 41–44 in | 32.5 in |
| X-Large | 39–42 in | 44–47 in | 32.5 in |
| 2X-Large | 43–44 in | 47–48 in | 32.5 in |
WOMEN’S TOPS & OUTERWEAR
| X-Small | 31–32 in | 24–25 in |
| Small | 33–35 in | 26–28 in |
| Medium | 36–38 in | 29–31 in |
| Large | 39–41 in | 32–34 in |
| X-Large | 42–44 in | 35–38 in |
| 2X-Large | 45–48 in | 39–42 in |
| X-Small | 33–35 in | 31.5 in |
| Small | 36–37 in | 32.0 in |
| Medium | 38–40 in | 32.5 in |
| Large | 41–43 in | 33.3 in |
| X-Large | 44–47 in | 34.0 in |
| 2X-Large | 48–51 in | 34.8 in |
WOMEN’S BOTTOMS
| Size | Waist | Hips | Inseam |
|---|---|---|---|
| X-Small (0) | 25–26 in | 34–35 in | 30.5 in |
| X-Small (2) | 26–27 in | 35–36 in | 30.5 in |
| Small (4) | 27–28 in | 36–37 in | 31.0 in |
| Small (6) | 28–29 in | 37–38 in | 31.0 in |
| Medium (8) | 29–30 in | 38–39 in | 31.0 in |
| Medium (10) | 30–31 in | 39–40 in | 31.0 in |
| Large (12) | 31–33 in | 40–42 in | 31.0 in |
| Large (14) | 33–35 in | 42–44 in | 31.5 in |
| X-Large (16) | 35–37 in | 44–46 in | 31.5 in |
| X-Large (18) | 37–39 in | 46–48 in | 31.5 in |
ALTRA SIZE CONVERSION CHART FOR EU, US, UK & CM
International sizes can be confusing, but we’ve simplified it.
Whether you’re trying to convert 44.5 EU to US size 10.5, or figure out what 26.5 cm equals in Euro sizes, our size chart lays it all out for you. You’ll find full conversion tables for Men’s & Women’s footwear, US, EU, UK and CM sizing.
Looking for assistance? Use our Shoe Finder Quiz to match your perfect model, and we’ll help you size it from there.