Altra men's and women's size chart

Good news from Altra shoes:

  • They run true-to-size in comparison to other running shoe brands
  • These models have the widest toebox in the running shoe industry

When trying your first pair of Altras, prepare to experience significantly more space in the toes than what you’re accustomed to. It may seem like the shoe runs big, so it’s important to take into account your foot length.

If there is about a thumbnail’s width space between the longest toe and the upper, the size is just right.

To raise the chances of getting an accurate Altra size, we recommend measuring your foot length and checking it with the chart below. 

Tip: If you fall in between sizes, go with the bigger one.

Altra men's and women's size chart

How Altra shoe sizes compare to others

Chances are high that you will need the same shoe size in Altra as you normally have in your running shoes. Especially if you’re coming from such brands as Topo, Hoka, or Brooks.

Foot length (mm) Altra Topo Athletic Hoka Brooks
Men's US sizes
260 8 8 8 8
270 9 9 9 9
280 10 10 10 10
Women's US sizes
230 6.5 6.5 6 6
240 7.5 7.5 7 7
250 8.5 8.5 8 8

To compare Altra sizes with other brands, go to the conversion tool at the bottom of the page. Input the size and brand that fits you well to find out its equivalent in Altra. 

Altra FootShape: widest toebox among running shoes

Altra’s roomy design is meant to accommodate all of your digits and let them splay freely. Although its volume may vary slightly from one shoe to another, overall, it fits on the wide side.

To learn more about the fit and sizing of each Altra model, see the information provided on our corresponding product pages. For example, you’ll see that Altra Olympus runs slightly short, and going half-a-size up may be recommended. However, Altra Lone Peak has been reported to feel half-a-size big even for wide-footed runners.


The brand designs its models with a gender-specific approach. Thus, you’ll find that women’s Altra shoes cater to the narrower heel and midfoot, higher instep, and other anatomic differences.

Altra men's size chart
Altra women's size chart